Explosion-proof mark
Explosion-proof electrical equipment is in accordance with the requirements of GB 3836, and the explosion-proof markings of explosion-proof electrical equipment include:
Explosion-proof type + equipment category + (gas group) + temperature group 1 Explosion-proof type According to the explosion-proof measures taken, explosion-proof electrical equipment can be divided into explosion-proof type, increased safety type, intrinsically safe type, positive pressure type,
Oil immersion type, sand filling type, encapsulation type, n type, special type, dust explosion-proof type, etc. Their identification is shown in Table 1. 
Table 1 Explosion-proof basic types Explosion-proof type explosion-proof type signs Explosion-proof type explosion-proof type signs Explosion-proof type Ex d Sand-filled type Ex q
Increased safety type Ex e encapsulated Ex m
Positive pressure type Ex p n type Ex n
Intrinsically safe type E x iaEx ib special type Ex s
Oil-immersed Ex o dust explosion-proof DIP ADIP B
2 Equipment category
Electrical equipment for explosive gas environment is divided into: 
Class I: Electrical equipment used in underground coal mines;
Class II: Electrical equipment for other explosive gas environments other than coal mines. 
Class II flameproof "d" and intrinsically safe "i" electrical equipment are further classified into IIA, IIB, and IIC. 
Electrical equipment for flammable dust environment is divided into: 
Type A dusttight equipment; Type B dust tight equipment;
Type A dustproof equipment; Type B dustproof equipment. 
3 Gas group The explosive capacity of an explosive gas mixture indicates the degree of explosion hazard. The greater the explosive capacity of an explosive mixture, the higher the risk. The explosive capacity of an explosive mixture can be expressed by the safety gap of the large test. At the same time, the difficulty of igniting explosive gases, liquid vapors and mists also indicates the degree of explosion hazard. It is expressed by the small ignition current ratio of Zui. Class II explosion-proof electrical equipment or intrinsically safe electrical equipment is further classified into IIA, IIB and IIC according to its large test safety clearance or small ignition current ratio applicable to explosive gas mixtures.
As shown in table 2. 
Table 2 Relationship between the group of explosive gas mixtures and the safety gap of the Zui test or the small ignition current ratio of the Zui gas group Zui large test safety gap MESG (mm) zui small ignition current ratio MICR
IIA MESG≥0.9 MICR>0.8
IIB 0.9>MESG>0.5 0.8≥MICR≥0.45
IIC 0.5≥MESG 0.45>MICR
4 Temperature group The ignition temperature of an explosive gas mixture is the temperature limit at which it can be ignited. 
The electrical equipment is divided into T1 to T6 groups according to its high surface temperature, so that the high surface temperature of the corresponding electrical equipment of the T1 to T6 group cannot exceed the allowable value of the corresponding temperature group. The relationship between the temperature group, the surface temperature of the equipment, and the ignition temperature of the flammable gas or vapor is shown in Table 3. 
Table 3 Relationship between temperature group, equipment surface temperature and ignition temperature of flammable gas or vapor
Temperature level zuEN high surface temperature IECT[°C] igniting temperature of flammable substances [IECC GB 3836]
T1 450 T>450
T2 300 450≥T>300
T3 200 300≥T>200
T4 135 200≥T>135
T5 100 135≥T>100
T6 85 100≥T>8
5 Examples of explosion-proof signs
In order to further clarify the indication method of the explosion-proof mark, the gas explosion-proof electrical equipment is exemplified as follows:
For example, electrical equipment is Class I explosion-proof type: the explosion-proof mark is ExdI
If the electrical equipment is type II flameproof, the gas group is group B, and the temperature group is T3, the explosion-proof mark is: ExdIIBT3.
If the electrical equipment is type II intrinsically safe ia, the gas group is group A, and the temperature group is T5, the explosion-proof mark is: ExiaIIA T5. 
For type I special type: ExsI. 
For the explosion-proof electrical equipment used in the mine except for biogas, under normal circumstances, the Class II gas group is Group B, and the temperature group is T3 flammable gas, the explosion-proof mark is: ExdIIIBT3. 
In addition, the contents of the explosion-proof mark can be adjusted as appropriate for the following special circumstances:
(1) If the electrical equipment adopts more than one composite type, the main explosion-proof type shall be marked first, followed by other explosion-proof types. Such as: Class II Group B main body explosion-proof type and increased safety type junction box T4 group of motors, the explosion-proof mark is: ExdeIIBT4. 〖JP3〗
(2) If only electrical equipment in a flammable gas or vapour environment is permitted, the marking may be expressed by the chemical formula or name of the gas or vapour. In this case, it is not necessary to indicate the gas group and temperature group. . Such as: Class II explosion-proof electrical equipment used in ammonia environment, the explosion-proof mark is: ExdII (NH3) or ExdII (ammonia). 
Conversely, using Table 2, the manufacturer can determine the temperature group of the product according to the environment in which the explosion-proof electrical product is used, and design the surface temperature or internal temperature of the casing of the electrical device according to the temperature group. Users of explosion-proof electrical equipment can conveniently select the temperature group of explosion-proof electrical products according to the type of explosive gas or vapor that may appear in the site. For example, if isobutane is present in the environment (ignition temperature 460 °C), explosion-proof electrical products in the T1 group can be selected; if butane and diethyl ether are present in the environment (ignition temperature 160 °C), the T4 group must be selected. Explosion-proof electrical products. 
For dust explosion-proof electrical equipment: 
For type A equipment that can be used in Zone 21, the high surface temperature TA is 170 °C, and its explosion-proof mark is: DIP A21 TA170 °C or DIP A21TA, T3;
For type B equipment that can be used in Zone 21, the high surface temperature TB is 200 °C, and its explosion-proof mark is: DIP B21 TB200 °C or DIP B21TB, T3
6 Requirements for setting the mark (1) Marks should be placed in obvious places on the main part of the electrical equipment;
(2) The mark must be considered to be clear and durable in the presence of possible chemical corrosion. If the mark Ex, explosion-proof type, category, temperature group can be marked with convex or concave marks on the obvious part of the outer casing,
The material of the signboard should be chemically resistant, such as bronze, brass or stainless steel. 
7 Examples of explosion-proof electrical equipment signs commonly used in the world
Table 4
International Electrotechnical Commission (IEC) Ex d [ia] IIC T5 where: Ex - Explosion-proof d - Protection mode (explosion-proof type) [ia] - Intrinsically safe output associated equipment II - Equipment category C - Gas Group T5 - Temperature group 〖〗 CENELEC (European Electrotechnical Commission) EEx d [ia] IIC T5 where EEx - European flag d - protection mode (explosion-proof type) [ia] - intrinsically safe output association Equipment II - Equipment Category C - Gas Groups T5 - Temperature Group US (NEC 505) (USA)  Class I, Zone 1, A Ex d [ia] IIC T5 Where Class I - Permitted Category Zone 1 — permitted location A — US National Standard Ex — Explosion-proof d — Protection mode (explosion-proof type) [ia] — Intrinsic safety II — Equipment category C — Gas group T5 — Temperature group Do not US (NEC 500) (United States) Explosionproof with I. S. Outputs, ClÉ‘ss I , Division 1, Group A, B, C, D, T5 where: Explosionproof with I. S. Outputs — Protection mode (optional except Iî€S)ClÉ‘ss I — Allowed categories Division 1 — Levels allowed (other than level 2, optional) Groups A, B, C, D – allowed Gas Group T5 - Temperature Group
NEC is the American Electrical Code. In 1996, Chapter 505 was added to the US Electrical Code to harmonize with the hazardous area division method of the I EC standard system commonly used internationally. NEC 500 is indicated as suitable for the North American hazardous area division system.
Fourth, the safe use of explosion-proof electrical products should start from the correct classification of dangerous places
The safety of explosion-proof electrical products depends not only on the safety performance of the products, but also on the safe use of the products. The article focuses on the important basic work of the safe use of explosion-proof electrical products, namely the classification of dangerous places. 
1 The safe use of explosion-proof electrical products is as important as the safety performance of products. For a long time, China has been involved in the national standards for explosion-proof electrical safety, mainly the basic standards for explosion-proof electrical (manufacturing inspection standards based on GB 3836 series) and explosion-proof electrical products. standard. The main body of implementation of these standards is the product manufacturing enterprise and the quality inspection organization of explosion-proof electrical products. However, the use of explosion-proof electrical products in hazardous locations to ensure explosion-proof safety depends not only on the products that provide high explosion-proof safety in the design, manufacturing and inspection departments, but also on the safe use of the user departments of the products. Explosion-proof electrical products with the best performance and quality, if not used properly, can not only play an explosion-proof role, but may even become a terrible killer that threatens safety. Many painful explosions have proved this. For example, the rubber seal ring in the explosion-proof electrical product cable introduction device is an important part to maintain the explosion-proof performance of the product. This part is often neglected in use and cannot be properly selected, installed and maintained. For example, some users do not press it after repairing. Some of the selected seal rings and materials do not meet the standard requirements, and some do not install seals after maintenance. As a result, flammable gases in hazardous locations can enter the junction box cavity unimpeded. An arc occurs at the junction of the terminals in the junction box. When sparks, it is possible to ignite flammable gases and cause an explosion. Examples of such explosions that cannot be safely used with explosion-proof electrical products account for a large proportion of the total statistics of explosion accidents. 
It can be seen that the safe use of explosion-proof electrical products and the manufacturing quality that reflects the safety performance of explosion-proof electrical products are equally important. This is just like when we are sick, we usually need a doctor to carefully check the symptoms of our body and then guide us to take the right medicine. Quality-qualified drugs must be combined with proper use to achieve a safe and symptomatic treatment. Otherwise, it may be counterproductive—quality-qualified drugs can not only cure diseases safely, but may even endanger your health. 
We refer to the safe use of explosion-proof electrical products, generally including the following aspects: correctly classify the types of explosion hazardous areas; correctly select and install explosion-proof electrical products; properly maintain and repair explosion-proof electrical products. 
It can be seen from the above that explosion-proof electrical safety is a systematic project, including the design, manufacture, inspection, classification of dangerous places, selection and installation of explosion-proof electrical products, maintenance and repair, and quality management and personnel related to this. Training and other aspects. Any negligence in any link can be a hidden danger of an explosion. 
It is true that many user departments also recognize the importance of the safe use of explosion-proof electrical products to ensure the safety of explosion-proof, but it has not been a long-term national standard to follow, so it can only be based on experience and some incomplete information. Some departmental standards and specifications to implement technical production management for the safe use of explosion-proof electrical products. Therefore, the formulation of a complete set of national standards that can be in line with international standards as soon as possible has always been an urgent concern of all parties. 
In recent years, with the development of China's explosion-proof electrical standardization work and the need to strengthen the integration with international standards, China's explosion-proof electrical standards have also evolved from the past product manufacturing inspection standards to manufacturing inspection, site division, and selection. Complete explosion-proof electrical safety standard system consisting of standards such as installation and maintenance. "Classification of dangerous places (GB 3836î€ 14-2000)", "Electrical installation of hazardous places (GB 3836î€15-2000)", Maintenance of electrical equipment for explosive gas atmosphere (GB 3836î€13-1997)" * In the form of national standards, the technical and management requirements for the safe use of explosion-proof electrical products by the user department are completely defined, which is of great significance for the safe production of explosive hazardous areas. In addition, due to the implementation of these three standards and international standards In order to meet the requirements, it has also created favorable conditions for China's petrochemical plants to enter the international market and to do a good job in the explosion-proof safety production and technical management of imported equipment.
2 Hazardous Location Classification is an important basic work for the safe use of explosion-proof electrical products. The above three standards for the user department, the primary, Zui-based work is the classification of the explosion hazardous areas involved in this department. This is just like a patient who visits a doctor. First, it must be diagnosed by a comprehensive examination and a doctor's analysis of the symptoms. Accurate diagnosis is the basis for symptomatic treatment and safe medication. This article is devoted to the analysis of the national standard “Classification of Hazardous Locations†(GB 3836î€14-2000). 
2.1 Purpose of Classification of Hazardous Locations Classification of hazardous locations is a method of analyzing and classifying sites where explosive atmospheres may occur. The purpose of site classification is to provide sufficient safety and economical efficiency for the selection and installation of explosion-proof electrical equipment used in such explosive hazardous locations. Because in hazardous locations where flammable substances are used, it is difficult to ensure that an explosive atmosphere never occurs. Also, it is difficult to ensure that electrical equipment used in hazardous locations is never a source of ignition. Therefore, a place with high risk (ie, a place where there is a high possibility of an explosive gas atmosphere) should select a type of explosion-proof electrical equipment with high safety performance. Conversely, for locations where there is less risk (ie, where the possibility of an explosive gas atmosphere is less likely), an explosion-proof electrical equipment type that has a slightly lower safety (but still has sufficient safety) and is relatively inexpensive can be selected. 
2.2 Main contents of classification of dangerous places There are two main aspects of classification of dangerous places:
(1) Divide the hazardous area into three areas based on the frequency and duration of the explosive gas environment.
Zone 0: a place where an explosive gas environment continuously appears or exists for a long time;
Zone 1: a place where an explosive atmosphere may occur during normal operation;
Zone 2: In normal operation, an explosive atmosphere is unlikely to occur, if it occurs, it happens occasionally, and it is only a place that exists for a short time. 
(2) Determine the quantity and range of hazardous locationså˜åœ¨
Because it is not enough to determine the type of the area of ​​a dangerous place, it is necessary to determine the quantity of such dangerous places in and around the equipment, and to determine the spatial extent of each type of dangerous place, that is, to determine the spatial extent of the place. Accurate quantification. 
2.3 Basic safety principles for classification of hazardous locations (1) When designing equipment and devices for handling or storing flammable substances, the categories of dangerous places should be made as small as possible, especially in areas 0 and 1 The number and scope of the districts have become small, that is, as far as possible, most of the dangerous places have become the two districts. 
(2) Equipment used in the process shall be mainly a level 2 release source. If this requirement is not met, the release source should also be released into the air in a very limited amount and release rate. 
(3) After the category of the dangerous place is determined, it is not allowed to change it at will. For the repaired process equipment, it must be carefully checked to confirm whether it can guarantee the safety level of the original design. 
2.4 Ideas for Classification of Hazardous Locations As defined by the definition of a hazardous location, a hazardous location is an area where an explosive atmosphere occurs or is expected to be in an amount sufficient to require special safety precautions for the construction, installation and use of electrical equipment. 
It can be seen from the definition that it is judged whether the place is a dangerous place, mainly according to whether the place may have an explosive gas environment, and the condition of the explosive gas environment is whether the concentration range of the flammable gas is within the explosion limit range. The concentration of flammable gas in the air is within the limits of this explosion limit (ie, the lower explosion limit and the upper explosion limit), and an explosion can be formed in the event of an ignition source; if it exceeds this range, a strong ignition source cannot be used to excite the explosion. That is to say, any mixture whose concentration is lower than the lower explosion limit or higher than the upper explosion limit will not cause the flame to propagate spontaneously when it comes into contact with the ignition source. When the concentration is lower than the lower explosion limit, excessive air is involved in the combustion reaction as an inert medium, which consumes a part of the heat of reaction and acts as a cooling agent to prevent the flame from self-propagating. On the contrary, when the concentration is higher than the upper limit of the explosion, the amount of air is excessive due to the combustibles. Insufficient, resulting in incomplete chemical reactions, the heat released by the reaction is less than the loss of heat, and thus hinder the spread of flame. 
It can be seen from the above that the quantity of flammable gas in the site is the key to determining the risk of the site, and the occurrence of flammable gas in the site mainly depends on the flammable gas release source and the ventilation condition that affects the accumulation of flammable gas. Therefore, we can come up with such a solution to the problem: the location is classified according to its risk--the danger of the site depends on the amount of explosive gas environment in the site--the explosive gas environment is the number of flammable gases. That is, the limit of the explosion limit - the amount of flammable gas present depends on the ventilation of the source and location. 
2.5 Method of site classification The core issue of site classification method is the analysis of the basic probability of explosive gas environment in the site, which requires the research and participation of experienced professionals. At the same time, it is necessary to accumulate and collect the operation of each device in the site. Information on conditions and environmental factors. Therefore, site classification should be determined by professionals familiar with the performance, equipment and process conditions of flammable substances and those engaged in safety, electrical and other related engineering and technical personnel. The specific method is as follows:
(1) Find and determine the source of release
The presence of flammable gases or vapours in the site may create an explosive atmosphere. Therefore, it is first necessary to find out whether the storage equipment, processing equipment or conveying pipeline containing flammable substances in the place may release flammable gas or vapor into the place, or whether the air may enter the container and mix with flammable gas or vapor to form an explosive property. mixture. 
Every piece of equipment (such as tanks, pipes, pumps, compressors, etc.) should be considered a potential source of release if it contains flammable substances inside. If they are unlikely to contain flammable substances, it is clear that they will not form an explosive mixture around them. If such equipment contains flammable substances but cannot escape or leak into the site, it may not be regarded as a source of release (for example, a seamless pipe placed in a certain space). 
If it has been confirmed that the device releases flammable substances into the site, the release frequency and duration should be determined first, and the level of the release source should be determined accordingly:
1) Continuous release source: a release source that is continuously released or is expected to be released over a long period of time. 
For example, the upper tank space and exhaust port of the fixed roof; the vicinity of the liquid surface of the open flammable liquid container shall be regarded as a continuous-stage release source.
2) Level 1 release source: A release source that is expected to be released periodically or occasionally during normal operation. 
For example, in normal operation, the seal of the pump, compressor or valve that is expected to release flammable substances to the surrounding area; the drain on the container containing the flammable liquid; during normal operation, it is expected that flammable substances may be released to the surroundings. Sampling points in the site; during normal operation, pressure relief valves, vents, or other openings that are expected to release flammable substances should be considered a Class 1 release source. 
3) Level 2 release source: It is not expected to be released during normal operation, and if released, it is only a release source for occasional and short-term release. 
For example, in normal operation, it is impossible to leak the seal of the compressor or valve; in normal operation, it is impossible to leak the flange, connecting piece or pipe joint; in normal operation, it is impossible to release the sampling of flammable substances to the surrounding place. Points and so on should be considered as Level 2 release sources. 
(2) Determining the type of area of ​​the hazardous area
The type of area in which the hazardous area is divided is mainly based on the release source level and ventilation conditions in the location. 
In general, the continuous-stage release source forms a hazardous area in Zone 0; the Level 1 release source forms a Zone 1 hazardous location; and the Level 2 release source forms a Zone 2 hazardous location. 
At the same time, the area division should be determined according to the ventilation conditions. If the ventilation is good, the area category of the hazardous area can be reduced. Conversely, if the ventilation is poor, the area category of the hazardous area can be improved. This is because the flammable gas or vapor released into the surrounding area will flow or diffuse by means of ventilation to dilute its concentration below the lower explosion limit. 
(3) Determining the area of ​​the hazardous area
There are many factors affecting the release rate of flammable gases or vapors, the lower explosion limit of gas, relative density, and ventilation conditions, etc., so the impact of their impact on the area of ​​the hazardous area should be determined. 
2.6 Factors affecting the area of ​​hazardous areas
(1) Rate of release of flammable substances
The greater the release rate, the greater the amount of flammable material released into the surrounding area per unit time, and the greater the range of the hazardous area.
(2) Lower explosion limit
For a certain amount of release, the lower explosion limit is reduced, and the amount of the explosive gas mixture whose concentration reaches above the lower explosion limit is correspondingly increased, and the range of the dangerous area is correspondingly increased. 
(3) Relative density of gas or vapour
If the relative density of the gas or vapor is less than that of air, then the gas and vapor lighter than the air will flow upwards, so that the range of dangerous areas in the vertical direction above the release source will increase as the relative density decreases; if gas or vapor Relatively denser than air, gases or vapors that are heavier than air tend to deposit on the ground, so that near the ground, the horizontal extent of the hazardous area will increase as the relative density decreases. 
(4) Ventilation
Increase the amount of ventilation to narrow the range of hazardous areas. This is because ventilation can blow off or dilute the flammable gases or vapors leaking from the site, reducing the range of hazardous areas. If the ventilation effect is good, the ventilation air volume is large enough, and the ventilation is continuous, for example, there is a spare fan, etc., the area category of the dangerous place can be reduced. 
In addition, obstacles around the release source can affect the ventilation effect and expand the range of the hazardous area. On the other hand, if obstacles (such as dams, walls, ceilings, etc.) can block the further diffusion of flammable gases or vapors to the surroundings, the obstacles can limit the extent of the dangerous areas to further extend to the periphery. 
The effects of different ventilation conditions on the extent of the hazardous area can be analyzed as follows:
1) Natural ventilation and overall forced ventilation
As described above, although the continuous-stage release source usually forms a zero-zone site, the first-order release source forms a zone 1 site, and the level 2 release source forms a zone 2 site. However, the actual production site is much more complicated due to the influence of ventilation. For example, good ventilation may make the area of ​​a hazardous area too small to be neglected and may become a less dangerous area. If the ventilation is particularly good, it may become a non-hazardous place. Conversely, if ventilation is poor, it may expand the area of ​​the hazardous area and may become a more dangerous area. 
2) When local forced ventilation
In general, the use of local forced ventilation to dilute explosive mixtures is better than natural ventilation and overall forced ventilation. As a result, the area of ​​the hazardous area is reduced or even reduced to a negligible level. It may become a less dangerous area category. It has even become a non-hazardous place. 
3) When there is no ventilation
When there is a release source in a non-ventilated place, the continuous-stage release source will definitely form a zero-zone place, the first-order release source may also form a zero-zone place, and the second-order release source may also form a 1-zone place. However, in special cases, such as when the amount of release is extremely small or when monitoring is released, it may also be made a less dangerous category. 
4) When obstacles restrict ventilation
If an obstacle in a hazardous area affects ventilation, it will expand the scope of the hazardous area or make it a more dangerous category. When considering the influence of obstacles, special attention should be paid to the relative density of gas or vapor in pits and recesses. 
5) When the ventilation device fails 
The classification of dangerous places is premised on the normal operation of the ventilation device. If the hazard in the event of a malfunction of the ventilation unit is negligible (if an automatic standby system is additionally provided), it is not necessary to change the classification of the hazardous location as determined by the proper operation of the ventilation unit. However, if the risk of failure of the ventilation unit cannot be ignored, the extent of expansion of the explosive mixture without forced ventilation should be predicted, and the frequency and duration of failure of the ventilation unit should be predicted, and the type of the location should be determined accordingly. 
If the ventilation unit does not malfunction or is short-lived even if it is faulty, the dangerous area that has been expanded due to the failure of the ventilation unit should be designated as the area 2 area. 
If measures can be taken to prevent the release of flammable substances in the event of a malfunction of the ventilation device (for example, the process is automatically stopped), it is not necessary to change the originally determined site classification. 
6) Other conditions
Other factors such as climatic conditions, topography, etc. can also affect the extent of the explosion hazard area. In summary, the following should be noted when determining the hazardous area:
Gases or vapors that are heavier than air may flow into spaces below the ground, such as grooves and trenches; gases or vapors that are lighter than air may remain in high spaces, such as roof space; if the source of release is outside the shop or near the site Measures should be taken to prevent a large amount of flammable gases or vapors from entering the workshop or site; the condition of ventilation has a great influence on the range of explosion-hazardous places, and great care should be taken when dividing the area. 
2.7 According to the classification of dangerous places and the classification of dangerous places, determine the category and scope of the site. At the production site, only the rough review of the design of the complete set of equipment or complete sets of equipment, the parts around the equipment are determined to be almost zero, 1 or 2 It is impossible, and the various possibilities of explosive mixture formation must be carefully analyzed. 
In order to determine the frequency of release of flammable substances, release time, release rate, concentration, ventilation and other factors affecting the type and scope of the hazardous area, it is necessary to carry out the process flow of the flammable substances that may form the release source one by one. Careful study and analysis. The National Standard GB 3836.14—2000 “Electrical Equipment for Explosive Atmospheres Part 14: Classification of Hazardous Locations†gives the suggestive appendix of “Hazardous Location Classification Schematic†and “Hazardous Location Division Exampleâ€. The method provides practical help. However, some examples of dangerous area ranges given in the standard are divided under certain conditions, and the conditions for their use should be noted. The examples given in the standard are only indicative examples. To use the examples in the standard for actual site classification, special details of the actual environment and various situations must be considered. For example, the division of hazardous areas of oil well facilities is Refers to the determination in general. If the oil pressure or air pressure of the well is very high, the corresponding range of the hazardous area will expand. In addition, in each case, only some influencing parameters are given, not all. In general, considering that these factors are specified, and some are qualitative rather than quantitative, the classification results are more conservative. That is to say, if it is possible to specify the operating parameters more closely, a more accurate site classification result will be obtained.  
V. Changes in general requirements for new gas explosion-proof standards GB3836.1-2000 "General requirements for electrical equipment for explosive gas atmospheres" has been officially promulgated by the State Bureau of Technical Supervision. The revision of this standard has always been a matter of great concern to all. The main revisions are as follows:
According to the provisions of “Using International Standards and Foreign Advanced Standards Management Measures†and relevant national technical policies, the revision of this standard closely follows the revision dynamics of international standards, equivalent to the IEC60079-0:1998 standard. In the main technical content and writing method, there are only minor differences in technology. These differences are in the form of “notes†(footnotes or notes), and the appendix is ​​added when there is more content.
I. Main differences between GB3836.1-2000 (hereinafter referred to as this standard) and IEC60079-0:1998 (hereinafter referred to as IEC standard) There are two articles and three appendices in total. That is, Article 8.3, the IEC standard provisions are "The provisions of 8.1 do not apply to Class I portable measuring instruments." However, China's standards have been stipulated for Class I portable or bracket type electric drills, portable instruments and lamps, and many years of practice have proved to be safe and feasible. In recent years, China has also established the national standard GB13813, which is evaluated by the friction spark test method. Therefore, this standard specifies the portable instruments that are not specified in the IEC standard to facilitate the design, manufacture and inspection of such products. Another example is the note in Article 27.1. The IEC standard has only the text and no notes. However, how to consider ensuring that “there may be “clear and durable†in the case of possible chemical corrosion, there will be different understandings in the implementation. In order to unify understanding, according to the requirements of Chinese standards for signs, in the form of notes, the standard in China The relevant requirements are valid and further explained “clearness and durabilityâ€.
"Appendix A: Inspection Procedures". The IEC standard has no specific provisions for inspection procedures. In order to meet the needs of China's explosion-proof electrical products inspection work, Appendix A has been added.附录 “Appendix C: Moisture Requirements for Class I Electrical Equipmentâ€. The IEC standard does not specify the moisture-proof requirements for Class I electrical equipment, and the user and the manufacturer shall determine the corresponding measures. According to the special requirements of coal mines in China, specific requirements for moisture prevention are put forward, and the test methods and the number of cycles are specified.
“Appendix E: Special Requirements for Plastic Cases for Class I Electrical Equipmentâ€. There is no such requirement in the IEC standard. According to the special requirements of coal mines in China, the plastic casing of Class I electrical equipment should have flame retardant properties. The specific test methods and requirements are specified in Appendix C. 
The IEC standard is in the process of considering the mining helmet lamp standard. In order to adapt to the production, inspection and use of mine helmet lights in China, this standard temporarily adopts the provisions of China's standard GB7957.
The above is the difference between this standard and the IEC standard, and the rest are equivalent to the IEC standard. 
Second, the difference between this standard and GB3836.1-83 (hereinafter referred to as the original standard) Standard Name The standard name is changed from "explosive environmental explosion-proof electrical equipment" to "explosive gas environmental electrical equipment" to distinguish it from explosive dust environment. This standard cancels the provisions of the "Article" in the preparation method. 
2. Explosion-proof type 
"Spark-free electrical equipment n" and "airtight electrical equipment h" have been eliminated in the explosion-proof type of special standard. Because the "n" type may not meet the requirements of this standard, it is an explosion-proof electrical equipment that does not consider the safety factor, and can only be applied to a safer place in Zone 2. The "h" type standard is formulated in accordance with the requirements of the sealing device in the IEC79 [CD1] 15 "n" type electrical equipment. As the "n" type standard is equivalent or equivalent to the IEC79-15 standard, the "h" type will be cancelled. This standard adds provisions for mining helmet lights. 
3. Reference Standards Where the Chinese standard is equivalent or equivalent to the IEC and ISO standards, the Chinese standard is adopted. According to the relevant provisions of the international standards, China's standards are not equivalent or equivalent to the IEC and ISO standards, and all international standards are directly adopted to promote the revision of these standards as soon as possible equivalent to or equivalent to international standards. 
The IEC and ISO standards directly quoted in the standard are cited in the standard provisions, and none of these standards are equivalent or equivalent to the Chinese standards. Therefore, the IEC and ISO standards are directly quoted. 
4. Definitions and Symbols Compared with the original standard, the "explosive electrical equipment for explosive atmospheres" was revised as "electrical equipment" and the "explosive gas mixture" was "explosive gas environment". The definitions of “special fastenersâ€, “guardsâ€, “sinking holesâ€, “prototypes†and “samplesâ€, “temperature groups†have been removed. Added "operating temperature", "zui high operating temperature", "rated value", "rated", "Ex cable entry device", "compression element", "clamping device", "wiring cavity", "connection Definitions of "," "Ex component", "symbol X", "symbol U", etc. Among them, "Ex cable introduction device" and "Ex component" are a relatively new concept. The Ex cable entry device is a cable entry device that is individually tested and forensic and installed with the device housing without the need for a certificate. According to international practice, the cable entry device can be removed from the device housing as a separate device and is a specialized standard part. It can be connected to the equipment casing by means of threads, holes, etc. The introduction device complies with the provisions of Appendix D of this standard or Appendix B of IEC60079-0. In China, the general cable entry devices are cast or welded together with the equipment casing. Cannot be used as a specialized standard component. Similarly, the Ex component is an explosion-proof component that cannot be used alone. It can be obtained separately, but the explosion-proof certificate number is followed by the symbol U.å½“å®ƒä¸Žå…¶ä»–ç”µæ°”è®¾å¤‡æˆ–ç³»ç»Ÿä¸€èµ·ä½¿ç”¨æ—¶éœ€é™„åŠ è®¤è¯ï¼Œå³éœ€å¦å¤–å–è¯ã€‚ ï¼¥x元件应符åˆæœ¬æ ‡å‡†é™„录Ｆ或ＩＥＣ６ï¼ï¼ï¼—９—ï¼é™„录Ｃ的规定。 
５.电气设备分类和温度组别 çˆ†ç‚¸æ€§æ°”ä½“çŽ¯å¢ƒç”¨ç”µæ°”è®¾å¤‡åˆ†ä¸ºâ… ç±»ï¼ˆç…¤çŸ¿ç”¨ï¼‰å’Œâ…¡ç±»ï¼ˆé™¤ç…¤çŸ¿å¤–çš„å…¶ä»–çˆ†ç‚¸æ€§æ°”ä½“çŽ¯å¢ƒç”¨ï¼‰ç”µæ°”è®¾å¤‡ã€‚â…¡ç±»éš”çˆ†åž‹â€œï½„â€å’Œæœ¬è´¨å®‰å…¨åž‹â€œï½‰â€ç”µæ°”设备，按爆炸性气体特性åˆåˆ†ä¸ºâ…¡ï¼¡ã€â…¡ï¼¢å’Œâ…¡ï¼£ç±»ã€‚å–æ¶ˆäº†åŽŸæ ‡å‡†â€œçº§åˆ«â€çš„概念。åªæœ‰éš”爆型“ｄâ€å’Œæœ¬è´¨å®‰å…¨åž‹â€œï½‰â€æŒ‰zui大试验安全间隙（ï¼ï¼¥ï¼³ï¼§ï¼‰å’Œzuiå°å¼•ç‡ƒç”µæµï¼ˆï¼ï¼©ï¼£ï¼‰ï¼Œåˆè¿›ä¸€æ¥åˆ’分为ⅡＡã€â…¡ï¼¢å’Œâ…¡ï¼£ç±»ã€‚ä¸åŒäºŽåŽŸæ ‡å‡†â€œåˆ†ä¸ºï¼¡ã€ï¼¢ã€ï¼£ä¸‰çº§â€ã€‚
所有防爆型å¼çš„Ⅱ类电气设备分为Ｔ１～Ｔ６组，并在产å“ä¸Šæ ‡å‡ºzui高表é¢æ¸©åº¦çš„æœ‰å…³æ ‡å¿—ã€‚æ¸©åº¦æ ‡å¿—å¯ä¼˜å…ˆæŒ‰è¡¨1æ ‡å‡ºæ¸©åº¦ç»„åˆ«ï¼Œæˆ–æ ‡å‡ºzui高表é¢æ¸©åº¦ï¼Œæˆ–äºŒè€…éƒ½æ ‡å‡ºã€‚äºŒè€…éƒ½æ ‡æ—¶ zui高表é¢æ¸©åº¦æ”¾åœ¨å‰é¢ï¼Œå¦‚zui高表é¢æ¸©åº¦ä¸ºï¼‘２５℃的工厂用增安型：ＥｘeⅡ１２５℃（Ｔ４）。必è¦æ—¶ç»™å‡ºå…¶é™å®šä½¿ç”¨çš„气体å称，如：Ⅱ类用于氨气环境的隔爆型：ＥｘdⅡ（ＮＨ３）或ＥｘdⅡ氨。
ï¼–.环境温度 环境温度超出ï¼ï¼’ï¼ï½žï¼‹ï¼”ï¼â„ƒèŒƒå›´æ—¶ï¼Œé™¤å¯æŒ‰åŽŸæ ‡å‡†è§„定在åç‰Œä¸Šæ ‡å‡ºå¤–ï¼Œæœ¬æ ‡å‡†è§„å®šè¿˜å¯åœ¨é˜²çˆ†åˆæ ¼è¯å·ä¹‹åŽåŠ “Xâ€ç¬¦å·è¡¨ç¤ºã€‚
７.对所有电气设备的规定
ä¸ŽåŽŸæ ‡å‡†ç›¸æ¯”å¢žåŠ äº†ï¼–ï¼Žï¼‘çˆ†ç‚¸æ€§æ°”ä½“çŽ¯å¢ƒç”¨ç”µæ°”è®¾å¤‡åº”ç¬¦åˆçš„规定。对电气设备承å—一些ä¸åˆ©çš„æ¡ä»¶ï¼ˆå¦‚：è¿è¡Œæ¡ä»¶æ¶åŠ£ã€æ½®æ¹¿å½±å“ã€åŒ–å¦å‰‚å½±å“ã€çŽ¯å¢ƒæ¸©åº¦çš„å˜åŒ–），由用户æ出è¦æ±‚ï¼Œç”¨æˆ·å’Œåˆ¶é€ åŽ‚åå•†è§£å†³ï¼Œè¿™æ˜¯å›½é™…æƒ¯ä¾‹ã€‚è€ƒè™‘åˆ°æˆ‘å›½ç…¤çŸ¿äº•ä¸‹æ½®æ¹¿çš„ç‰¹æ®Šæƒ…å†µï¼Œå¯¹â… ç±»ç”µæ°”è®¾å¤‡è¡¥å……äº†ç»Ÿä¸€çš„é˜²æ½®è§„å®šï¼Œå…·ä½“è¦æ±‚è§é™„录Ｃ。对具有快开å¼é—¨æˆ–盖的电气设备，è¦é™åˆ¶å…¶å¼€é—¨çš„速度，内装电容器时开门所需时间间隙须大于电容器放电至下列剩余能é‡æ‰€éœ€æ—¶é—´ï¼šå……电电压大于２ï¼ï¼ï¼¶æ—¶â…¡ï¼¡ç”µæ°”设备ï¼ï¼Žï¼’ï½ï¼ªï¼Œâ…¡ï¼¢ç”µæ°”设备ï¼ï¼Žï¼ï¼–ï½ï¼ªï¼Œâ…¡ï¼£ç”µæ°”设备ï¼ï¼Žï¼ï¼’ï½ï¼ªã€‚充电电压低于２ï¼ï¼ï¼¶æ—¶å‰©ä½™èƒ½é‡å¯ä¸ºä¸Šè¿°å€¼çš„ï¼’å€ã€‚ä¸ŽåŽŸæ ‡å‡†ç›¸æ¯”ï¼Œå¢žåŠ äº†ä½ŽäºŽï¼’ï¼ï¼ï¼¶æ—¶å¯ä¸ºä¸Šè¿°å€¼ï¼’å€çš„规定。充电电压大于２ï¼ï¼ï¼¶æ—¶çš„è§„å®šä¸ŽåŽŸæ ‡å‡†ä¸€è‡´ã€‚å†…è£…ç”µçƒå…ƒä»¶çš„è§„å®šä¸ŽåŽŸæ ‡å‡†ä¸€è‡´ã€‚î€„
8.éžé‡‘属外壳和外壳的éžé‡‘属部件
对于éžé‡‘属外壳和外壳的éžé‡‘属部件（å³åŽŸæ ‡å‡†çš„å¡‘æ–™å¤–å£³ï¼‰ï¼Œæ”¹åŠ¨è¾ƒå¤§ã€‚æœ¬æ ‡å‡†è§„å®šï¼šî€„
éžé‡‘属外壳和外壳的éžé‡‘属部件应按２３．４．７的规定进行è€çƒã€è€å¯’ã€æœºæ¢°ã€å…‰è€åŒ–ã€è€åŒ–å¦è¯•å‰‚ã€è¡¨é¢ç”µé˜»ç‰è¯•éªŒï¼Œå¯†å°åœˆåº”按附录Ｄä¸ï¼“．３的规定进行è€åŒ–试验。
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对移动å¼å¯èƒ½è¢«æ‘©æŽ§æˆ–擦æ‹å¡‘料部件的固定å¼ç”µæ°”设备，应设计为æ£å¸¸ç»´æŠ¤å’Œè¿›è¡Œæ¸…æ´æ—¶èƒ½é˜²æ¢äº§ç”Ÿå¼•ç‡ƒå±é™©çš„é™ç”µç”µè·çš„结构。ä¸èƒ½é˜²æ¢æ—¶åº”用è¦å‘Šç‰Œè¯´æ˜Žè¿è¡Œä¸é¡»é‡‡å–的安全措施。
â… ç±»ç”µæ°”è®¾å¤‡å¡‘æ–™å¤–å£³çš„è¡¨é¢å¤§äºŽï¼‘ï¼ï¼ï½ƒï½î€‹ï¼“时，按照２３．４．７．８在特定æ¡ä»¶ä¸‹ï¼»æ¸©åº¦ï¼ˆï¼’３±２）℃相对湿度（５ï¼Â±ï¼•ï¼‰ï¼…］，测得的表é¢ç»ç¼˜ç”µé˜»ä¸åº”è¶…è¿‡ï¼‘ï¼§Î©ã€‚æ¸©åº¦æ ‡å¿—å¯ä¼˜å…ˆæŒ‰è¡¨1æ ‡å‡ºæ¸©åº¦ç»„åˆ«ï¼Œæˆ–æ ‡å‡ºzui高表é¢æ¸©åº¦ï¼Œæˆ–äºŒè€…éƒ½æ ‡å‡ºã€‚î€„
Ⅱ类电气设备除通过åˆç†é€‰æ达到上述è¦æ±‚外（表é¢ç”µé˜»ä¸è¶…过１ＧΩ），还å¯é€šè¿‡é™å®šå¡‘料外壳和外壳部件的zui大表é¢é¢ç§¯æ¥è¾¾åˆ°ï¼ˆâ…¡ï¼¡ã€â…¡ï¼¢ç±»ç”µæ°”设备ä¸å¾—超过１ï¼ï¼ï½ƒï½î€‹ï¼’，如塑料裸露部分用接地金属框架围ç€ï¼Œå¯ä¸è¶…过４ï¼ï¼ï½ƒï½î€‹ï¼’；ⅡＣ类电气设备包括é€æ˜Žä»¶ä¸å¾—超过２ï¼ï½ƒï½î€‹ï¼’ï¼Œå¦‚å¡‘æ–™éƒ¨ä»¶æœ‰é™„åŠ é˜²é™ç”µç”µè·æŽªæ–½ï¼Œå¯å¢žè‡³ï¼‘ï¼ï¼ï½ƒï½î€‹ï¼’）。也å¯é€‰æ‹©åˆç†å°ºå¯¸ã€å½¢çŠ¶å’Œå¸ƒç½®ï¼Œæˆ–采å–其他安全措施æ¥è¾¾åˆ°ã€‚如ä¸èƒ½é€šè¿‡å¤–壳的设计æ¥é¿å…产生引燃å±é™©é™ç”µç”µè·æ—¶ï¼Œåˆ™åº”设一个è¦å‘Šç‰Œæ ‡æ˜Žåœ¨è¿è¡Œä¸é‡‡ç”¨çš„安全措施。
应该注æ„的是在选择电气ç»ç¼˜æ料时，应考虑其zuiå°è¡¨é¢ç»ç¼˜ç”µé˜»ï¼Œä»¥é˜²æ¢å¡‘料部件碰触带电件而产生的问题。用于有爆炸性气体长时间æŒç»å˜åœ¨çš„场所（如ï¼åŒºåœºæ‰€ï¼‰çš„塑料外壳部件还应有更进一æ¥çš„é™åˆ¶ã€‚
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１ï¼.紧固件
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１１.è”é”装置
è”é”装置在结构上应ä¿è¯ç”¨éžä¸“用工具ä¸èƒ½è½»æ˜“解除其作用，è”é”解除å‰ä¸èƒ½ç ´å其防爆型å¼ã€‚
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１３.粘接æ料
粘接æ料应有足够的çƒç¨³å®šæ€§ï¼Œå…¶æžé™æ¸©åº¦å€¼åº”超过电气设备的zui高温度至少２ï¼ï¼«ã€‚
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粘接æ料若承å—ä¸åˆ©è¿è¡Œæ¡ä»¶ï¼Œç”±åˆ¶é€ 厂和用户å商解决措施。
１４.Ｅｘ元件 Ｅｘ元件是ç‰åŒï¼©ï¼¥ï¼£æ ‡å‡†è€Œå¢žåŠ 的一新概念。Ｅｘ元件å³é˜²çˆ†å…ƒä»¶ï¼Œå®ƒå¯å•ç‹¬å–è¯ï¼Œä½†é˜²çˆ†åˆæ ¼è¯ç¼–å·åŽåŠ “Ｕâ€ç¬¦å·ï¼Œä»¥è¡¨æ˜Žå…¶ä¸ºï¼¥ï½˜å…ƒä»¶ã€‚它ä¸èƒ½å•ç‹¬ä½¿ç”¨ï¼Œå’Œå…¶ä»–电气设备或系统一起使用时，须和其他电气设备一起é‡æ–°è¿›è¡Œè¡¥å……检验认è¯ã€‚
Ｅｘ元件应满足附录Ｆ的规定，Ｅｘ元件å¯ä»¥æ˜¯ç©ºå¤–壳。或与设备一起使用。并符åˆï¼‘．２所列一个或多个防爆型å¼çš„规定。Ｅｘ元件å¯å®‰è£…在设备外壳内ã€å¤–壳外，或部分在外壳内部分在外壳外。安装在外壳内的Ｅｘ元件，å•ç‹¬ä¸èƒ½æ£€éªŒçš„部分，安装åŽä»è¦è¿›è¡Œæ£€éªŒã€‚如元件的表é¢æ¸©åº¦ï¼Œç”µæ°”间隙爬电è·ç¦»ç‰ã€‚安装在外壳外ã€æˆ–部分在内ã€éƒ¨åˆ†åœ¨å¤–的Ｅｘ的元件，与外壳的接åˆé¢åº”符åˆæœ‰å…³é˜²çˆ†åž‹å¼çš„规定，并进行机械（冲击）试验。
１５.连接件和接线空腔 ä¸ŽåŽŸæ ‡å‡†ç›¸æ¯”å–消了采用永久引入电缆的é™åˆ¶ï¼Œä½†å¯¹æ‰€æœ‰é‡‡ç”¨æ°¸ä¹…引入电缆的设备å‡åº”在防爆åˆæ ¼è¯å·åŽåŠ “Ｘâ€ç¬¦å·ã€‚ä»¥è¡¨æ˜Žæ°¸ä¹…ç”µç¼†çš„è‡ªç”±ç«¯åº”æœ‰é€‚å½“çš„æŽªæ–½åŠ ä»¥ä¿æŠ¤ã€‚
接线空腔符åˆï¼‘．２所列一ç§é˜²çˆ†åž‹å¼ã€‚电气设备应设连接件与外部电路相连。接线空腔和出线å£åº”有足够尺寸以方便导线连接。并使电气间隙爬电è·ç¦»ç¬¦åˆç›¸åº”防爆型å¼æ ‡å‡†çš„规定。
１６.接地连接件 ä¸ŽåŽŸæ ‡å‡†ç›¸æ¯”æŽ¥åœ°è¿žæŽ¥ä»¶çš„è§„æ ¼ä¿®è®¢ä¸ºå†…æŽ¥åœ°ä¸Žå¤–æŽ¥åœ°çš„è¿žæŽ¥ä»¶è§„æ ¼ç›¸åŒã€‚外接地连接件还应与至少截é¢ç§¯ä¸ºï¼”ï½ï½î€‹ï¼’的接地线有效连接。
电气设备应设内接地和外接地连接件。内外接地应有电气上的连接（ä¸ä¸€å®šæœ‰å¯¼çº¿è¿žæŽ¥ï¼‰ã€‚特殊情况下（åŒé‡ç»ç¼˜ã€åŠ 强ç»ç¼˜ã€å®‰è£…在金属导管系统上）å¯ä¸è®¾å†…外接地连接件。连 接件应有防è…措施。结构上应能防æ¢å¯¼çº¿æ¾åŠ¨ã€æ‰è½¬ï¼Œèƒ½æŒä¹…ä¿æŒæŽ¥è§¦åŽ‹åŠ›ã€‚与轻金属连接时，须采å–特殊预防措施（如应用钢质过渡件）。
１７.电缆和导管引入装置
åˆ¶é€ åŽ‚åœ¨æ供给检验å•ä½çš„文件ä¸åº”指明引入电缆或导管的ä½ç½®å’Œzui大å…许数é‡ã€‚
引入装置一般åšä¸ºå•ç‹¬çš„部件进行试验和å‘è¯ï¼Œä¹Ÿå¯ä¸Žè®¾å¤‡ä¸€èµ·è¯•éªŒå’Œå‘è¯ã€‚
引入装置还应符åˆé™„å½•ï¼¤çš„è§„å®šã€‚â… ç±»ç”µç¼†å¼•å…¥è£…ç½®åº”è®¾æœ‰å¤¹ç´§è£…ç½®ã€‚å¼•å…¥è£…ç½®çš„å¯¼ç®¡éƒ¨åˆ†å¯ä»¥ç”¨èžºçº¹æˆ–å…‰å”与电气设备连接。多余的引入装置å”应用å°å µä»¶å°å µï¼Œå¹¶ç¬¦åˆç›¸åº”防爆型å¼çš„规定。
ä¸ŽåŽŸæ ‡å‡†ç›¸æ¯”å–消了密å°åœˆé‚µå°”æ°ç¡¬åº¦åŠå°ºå¯¸çš„规定，而åªä»¥ç›¸åº”的试验æ¥è€ƒæ ¸ã€‚å¢žåŠ äº†å¼•å…¥è£…ç½®çš„è€å†²å‡»è¯•éªŒã€é˜²æŠ¤è¯•éªŒï¼Œä»¥åŠå¼•å…¥è£…ç½®çš„æ ‡å¿—ã€å¯†å°åœˆçš„æ ‡å¿—ç‰çš„规定。
在é¢å®šå·¥ä½œçŠ¶æ€ä¸‹ï¼Œå¦‚电缆或导管引入装置部ä½çš„温度高于７ï¼â„ƒï¼Œæˆ–电缆分支部ä½é«˜äºŽï¼˜ï¼â„ƒï¼Œåˆ™ç”µæ°”è®¾å¤‡å¤–éƒ¨åº”è®¾ä¸€æ ‡ç¤ºç‰Œï¼Œä»¥ä¾¿ç”¨æˆ·é€‰ç”¨åˆé€‚的电缆，或在导管ä¸é€‚当布线。
密å°åœˆå¼ç”µç¼†å¼•å…¥è£…ç½®å‡åº”è¿›è¡Œå¤¹ç´§è¯•éªŒï¼Œä¸ŽåŽŸæ ‡å‡†ç›¸æ¯”å–消了Ⅱ类æºå¸¦å¼æˆ–移动å¼å’Œâ… 类电气设备引入装置æ‰è¿›è¡Œå¤¹ç´§è¯•éªŒçš„规定。
１８.旋转电机的补充规定 æœ¬æ ‡å‡†ä¸ŽåŽŸæ ‡å‡†ç›¸æ¯”ï¼Œå¢žåŠ äº†â… ç±»æ—‹è½¬ç”µæœºé€šé£Žå”的结构和布置，使大于１２．５ï½ï½çš„异物ä¸å› åž‚ç›´å è½æˆ–振动而触åŠç”µæœºçš„旋转部件，å¯é‡‡ç”¨IＰ１ï¼çš„防护ç‰çº§ã€‚å¢žåŠ äº†å¡‘æ–™é£Žæ‰‡çš„å¡‘æ–™æ质的çƒç¨³å®šæ€§è¦æ±‚，å³å¡‘料的使用温度应高于风扇é¢å®šè¿è¡Œæ¸©åº¦è‡³å°‘ï¼’ï¼ï¼«ã€‚风扇用å«è½»é‡‘属ææ–™åˆ¶é€ æ—¶ï¼Œåº”ç¬¦åˆï¼˜ï¼Žï¼‘或８．３的规定。
１９.开关的补充规定
触头å¼å¼€å…³ä¸å…许浸在å¯ç‡ƒæ€§ç»ç¼˜æ²¹ä¸ã€‚å–æ¶ˆäº†åŽŸæ ‡å‡†çš„ç‰¹æ®Šè§„å®šã€‚å¢žåŠ äº†å¼€å…³æŸœè®¾éš”ç¦»å™¨æ—¶ï¼Œéš”ç¦»å™¨çš„æŽ¥è§¦å’Œæ–å¼€ä½ç½®å¿…须表示明确。开关的外壳内带é¥æŽ§ç”µè·¯æ—¶ï¼Œå¤–壳的门或盖应符åˆä¸‹åˆ—è¦æ±‚：
（1） 门或盖与隔离器è”接。内部éžä¿æŠ¤ç”µè·¯èƒ½æ–开的除外。
（2） 如在隔离器æ–开情况下一些内部元件ä»å¸¦ç”µæ—¶ï¼Œåˆ™å¸¦ç”µå…ƒä»¶åº”采用１．２规定的防爆型å¼ä¿æŠ¤ï¼Œæˆ–电气间隙爬电è·ç¦»ç¬¦åˆå¢žå®‰åž‹â€œï½…â€çš„规定，并且内部用一补充壳体把带电件ä¿æŠ¤åœ¨å†…，壳体的防护ç‰çº§ä¸ºï¼©ï¼°ï¼’ï¼ï¼Œä¸”工具ä¸èƒ½ç›´æŽ¥æŽ¥è§¦å¸¦ç”µä»¶ï¼Œå†…部壳体设“严ç¦å¸¦ç”µå¼€ç›–â€çš„è¦å‘Šç‰Œã€‚
（3） 如ä¸è®¾è”é”则应设“严ç¦å¸¦ç”µå¼€ç›–â€çš„è¦å‘Šç‰Œã€‚
ï¼’ï¼.熔æ–å™¨çš„è¡¥å……è§„å®šï¼ˆåŽŸæ ‡å‡†æ— æ¤æ¡è§„定）
有熔æ–器的外壳应设è”é”装置，è”é”装置应在更æ¢æˆ–安装熔æ–器时切æ–电æºï¼Œå¹¶ä¸”在外壳关åˆå¯é åŽæ‰èƒ½ä½¿ç†”æ–器带电，或者增设“严ç¦å¸¦ç”µå¼€ç›–â€çš„è¦å‘Šç‰Œã€‚
２１.æ’æŽ¥è£…ç½®çš„è¡¥å……è§„å®šï¼ˆåŽŸæ ‡å‡†æ— æ¤æ¡è§„定）
æ’接装置应用机械ã€ç”µæ°”或其他方法è”é”，è”é”应使æ’接装置在带电æ¡ä»¶ä¸èƒ½æ–开，æ–开时æ’头ä¸å¾—带电。或用特殊紧固件将æ’头与æ’座连在一起，并设“严ç¦å¸¦ç”µæ–å¼€â€çš„è¦å‘Šç‰Œã€‚如æ’æŽ¥è£…ç½®ä¸Žç”µæ± è”接，æ–å¼€å‰ä¸èƒ½æ–电，则è¦å‘Šç‰Œæ ‡å¿—为“åªå…许在éžå±é™©åœºæ‰€æ–å¼€â€ã€‚
é¢å®šç”µæµåœ¨ï¼‘ï¼ï¼¡ä»¥å†…，é¢å®šç”µåŽ‹äº¤æµï¼’５ï¼ï¼¶ç›´æµï¼–ï¼ï¼¶ä»¥å†…时的æ’接装置，符åˆä»¥ä¸‹è¦æ±‚时，å¯ä¸è®¾è”é”或特殊紧固件。
（1） æ’座在电æºä¾§ï¼›î€„
（2） æ’头与æ’座分离å‰æœ‰ç弧延迟时间；
（3） 在ç弧期间æ’头座å‡åº”符åˆéš”爆型“ｄâ€çš„è¦æ±‚；
（4） 分开åŽå¸¦ç”µä»¶ä»åº”符åˆï¼‘．２所规定的任一防爆型å¼ã€‚
æ— è®ºåœ¨ä»»ä½•æƒ…å†µä¸‹éƒ½ä¸¥ç¦æœªæ’å…¥æ’座的æ’头元件带电。
ï¼’ï¼’.ç¯å…·çš„补充规定
ä¸ŽåŽŸæ ‡å‡†ç›¸æ¯”å–æ¶ˆäº†â… ç±»è®¾è¦å‘Šç‰Œç¯å…·çš„ç¯åº§ï¼ˆç¬¦åˆï¼§ï¼¢ï¼‘４４４的规定）è¦æ±‚ã€å光罩ã€ç¯åº§è¿žæŽ¥ä»¶æ ‡å¿—“Ｏâ€ç‰çš„è¦æ±‚。ä¿æŠ¤ç½‘网å”é¢ç§¯å¤§äºŽï¼ˆï¼•ï¼Ã—５ï¼ï¼‰ï½ï½î€‹2æ—¶ï¼Œè§†ä¸ºæ— ä¿æŠ¤ï¼Œå–消了表４的规定。
æœ¬æ ‡å‡†è§„å®šç¯å…·åº”有é€æ˜Žä¿æŠ¤ç½©ï¼Œé€æ˜Žä¿æŠ¤ç½©å¯ç”±ä¿æŠ¤ç½‘æ¥ä¿æŠ¤ï¼Œä¿æŠ¤ç½‘的网å”应å°äºŽï¼•ï¼Ã—５ï¼ï½ï½ï¼Œ å¦‚è¶…è¿‡åˆ™è§†ä¸ºæ— ä¿æŠ¤ç½‘。é€æ˜Žç½©å’Œä¿æŠ¤ç½‘å‡åº”ç»å—å†²å‡»è¯•éªŒçš„è€ƒæ ¸ã€‚î€„
ç¯å…·ç”¨åŠçŽ¯å®‰è£…时，åŠçŽ¯åº”铸在或焊接在外壳上。若åŠçŽ¯ç”¨èžºçº¹æ—‹åœ¨å¤–壳上，则须å¦æœ‰é˜²æ¾æŽªæ–½ã€‚ç¯å…·ä¸å…许åªæœ‰ä¸€ä¸ªèžºé’‰å®‰è£…。
ç¯å…·å¯æ‰“开的盖å，应有自动è”é”装置，使ç¯ç›–打开时ç¯åº§çš„所有电æžå‡åˆ‡æ–电æºï¼ˆæœ¬è´¨å®‰å…¨åž‹ç¯å…·é™¤å¤–）。如果æ–路器æ–å¼€åŽé™¤ç¯åº§å¤–æŸäº›éƒ¨ä»¶ä»å¸¦ç”µæ—¶ï¼Œåˆ™è¿™äº›å¸¦ç”µéƒ¨ä»¶åº”用１．２规定的防爆型å¼ä¹‹ä¸€è¿›è¡Œä¿æŠ¤ï¼Œæˆ–电气间隙爬电è·ç¦»ç¬¦åˆå¢žå®‰åž‹â€œï½…â€çš„è§„å®šï¼Œä¸”é™„åŠ å¤–å£³æŠŠå¸¦ç”µéƒ¨ä»¶ä¿æŠ¤åœ¨å†…ï¼Œé™„åŠ å¤–å£³åº”ç¬¦åˆï¼§ï¼¢ï¼”ï¼’ï¼ï¼˜çš„ＩＰ３ï¼çš„规定，且工具ä¸èƒ½ç»è¿‡å¼€å£ç›´æŽ¥æŽ¥è§¦å¸¦ç”µä»¶ï¼Œé™„åŠ å¤–å£³ä¸Šè¿˜åº”è®¾â€œä¸¥ç¦å¸¦ç”µæ‰“å¼€â€çš„è¦å‘Šç‰Œã€‚也å¯è®¾ç½®â€œä¸¥ç¦å¸¦ç”µæ‰“å¼€â€è¦å‘Šç‰Œï¼Œä»£æ›¿è”é”装置。
ä¸å…è®¸ç”¨æ¸¸ç¦»é‡‘å±žé’ ç¯ï¼ˆç¬¦åˆï¼©ï¼¥ï¼£ï¼‘ï¼™ï¼’çš„ä½ŽåŽ‹é’ ç¯ï¼‰ï¼Œå¯ä»¥ä½¿ç”¨é«˜åŽ‹é’ ç¯ï¼ˆä¾‹å¦‚符åˆï¼©ï¼¥ï¼£ï¼–ï¼–ï¼’çš„é’ ç¯ï¼‰î€„
手æç¯å’Œå¸½ç¯çš„补充规定：
â… ç±»å¸½ç¯åº”符åˆï¼§ï¼¢ï¼—９５７矿用安全帽ç¯çš„规定。
Ⅱ类帽ç¯å’Œæ‰‹æç¯åœ¨ç¯å…·å¤„于ç§ç§ä½ç½®çŠ¶æ€å‡åº”防æ¢ç”µè§£æ¶²æµå‡ºã€‚å…‰æºå’Œç”µæºåˆ†åˆ«åœ¨ä¸åŒå¤–壳ä¸ç”¨ç”µç¼†è¿žæŽ¥æ—¶ï¼Œç”µç¼†å¼•å…¥è£…置和电缆按附录Ｄä¸ï¼¤ï¼“．１进行试验。
２３.æœ¬æ ‡å‡†å–æ¶ˆäº†åŽŸæ ‡å‡†ä¸ç©ºé—´åŠ çƒå™¨çš„规定。
ï¼’ï¼”.æœ¬æ ‡å‡†å¢žåŠ äº†åž‹å¼æ£€æŸ¥å’Œè¯•éªŒçš„内容
ç›®çš„åœ¨äºŽç¡®è®¤ç”µæ°”è®¾å¤‡æ ·æœºç¬¦åˆæœ¬æ ‡å‡†å’Œæœ‰å…³é˜²çˆ†åž‹å¼ä¸“ç”¨æ ‡å‡†çš„è§„å®šã€‚î€„
åˆ¶é€ åŽ‚åº”æ供技术资料ã€å›¾çº¸è¯´æ˜Žèƒ½ç¡®åˆ‡å®Œæ•´åœ°ä¿è¯ç”µæ°”设备的防爆安全性，检验å•ä½åº”审查技术资料ã€å›¾çº¸æ˜¯å¦ç¬¦åˆæœ¬æ ‡å‡†å’Œé˜²çˆ†åž‹å¼ä¸“ç”¨æ ‡å‡†çš„è§„å®šã€‚æ£€éªŒå•ä½è¿˜åº”æ£€æŸ¥åˆ¶é€ åŽ‚æä¾›çš„æ ·æœºæˆ–æ ·å“是与技术资料ã€å›¾çº¸ç›¸ç¬¦ï¼Œå¹¶è¿›è¡Œæœ‰å…³è¯•éªŒã€‚
检验å•ä½å¯å–消ä¸å¿…è¦çš„试验，但应记下å–消的ç†ç”±ã€‚对Ｅｘ元件试验过的项目ä¸å†é‡å¤è¯•éªŒã€‚æŸäº›è¯•éªŒå¯åœ¨æ£€éªŒå•ä½çš„试验室进行。也å¯åœ¨æ£€éªŒå•ä½ç›‘ç£ä¸‹çš„其他地方进行。如æ£åŽ‹åž‹â€œï½â€å¯åœ¨åˆ¶é€ 厂或用户进行zuiå°æ¢æ°”é‡ã€æ£åŽ‹å€¼ã€å¤–壳强度ç‰è¯•éªŒã€‚试验结果如ä¸ç¬¦åˆæ ‡å‡†è§„定时，检验å•ä½å¯æŒ‰å®žé™…情况è¦æ±‚对电气设备进行修改。å„项试验å‡åº”在检验å•ä½è®¤ä¸ºzuiä¸åˆ©çš„情况下进行。
２５.冲击试验
æœ¬æ ‡å‡†å–æ¶ˆäº†åŽŸæ ‡å‡†å¯¹é€æ˜Žä»¶é‡‡ç”¨èšé…°èƒºï¼ˆå°¼é¾™ï¼‰é”¤å¤´è¿›è¡Œå†²å‡»è¯•éªŒçš„规定。
冲击锤应安装一个直径为２５ï½ï½çš„åŠçƒå½¢æ·¬ç«é’¢åˆ¶å†²å‡»å¤´ï¼Œå†²å‡»é”¤è´¨é‡ä¸ºï¼‘ｋｇ自高度ｈ垂直下è½å†²å‡»ç”µæ°”设备表é¢ã€‚冲击能é‡è§è¡¨ï¼”。表４ä¸â… ç±»æ— ä¿æŠ¤é€æ˜Žä»¶å†²å‡»çš„能é‡ç”±åŽŸæ ‡å‡†ï¼‘ï¼ï¼ªæ”¹ä¸ºï¼—Ｊ。
通常试验在装é…完好的电气设备上进行。对é€æ˜Žä»¶è¯•éªŒæœ‰å›°éš¾æ—¶ï¼Œå¯å°†é€æ˜Žä»¶è£…åœ¨è®¾å¤‡æœ¬èº«æˆ–ç±»ä¼¼çš„æ”¯æž¶ä¸Šè¿›è¡Œè¯•éªŒã€‚åˆ¶é€ åŽ‚ä¸Žæ£€éªŒå•ä½å商åŒæ„åŽï¼Œä¹Ÿå¯åœ¨ç©ºå¤–壳上进行。
玻璃é€æ˜Žä»¶åœ¨ä¸‰ä¸ªæ ·å“上进行试验，æ¯ä¸ªæ ·å“è¯•ä¸€æ¬¡ï¼Œå…¶ä»–é›¶ä»¶åº”åœ¨äºŒä¸ªæ ·å“上进行试验，æ¯ä»¶æ ·å“在两个ä¸åŒä½ç½®å„进行一次试验。
通常试验环境温度为（２ï¼Â±ï¼•ï¼‰â„ƒï¼ˆåŽŸæ ‡å‡†ä¸ºï¼ˆï¼’ï¼Â±ï¼‘ï¼â„ƒï¼‰ã€‚æ料在低温下抗冲击性能é™ä½Žæ—¶ï¼Œè¯•éªŒåœ¨è§„定的zuiä½Žæ¸©åº¦ä¸‹è¿›è¡Œï¼ˆåŽŸæ ‡å‡†æœªè¯´æ˜Žæ¤è¦æ±‚）。
塑料部件应在比zui高工作温度高１ï¼Kzui多高１５K的温度下和比zui低工作温度低５Kzui多低１ï¼Kçš„æ¸©åº¦ä¸‹åˆ†åˆ«è¿›è¡Œè¯•éªŒï¼ˆåŽŸæ ‡å‡†é«˜æ¸©è‡³å°‘ï¼•ï¼â„ƒï¼Œä½Žæ¸©ï¼ï¼’５℃±３℃，户内ï¼ï¼•â„ƒÂ±ï¼’℃）。
试验时电气设备放在zuiå°‘ï¼’ï¼ï½‹ï½‡çš„钢质基座上。
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２９.温度试验
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３１.éžé‡‘属外壳和外壳的éžé‡‘属部件的试验
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３３.例行检查和试验
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修改的内容如下：
（1） é€æ£€çš„技术文件ä¸ï¼Œäº§å“图纸åªè¦æ±‚é€ä¸Žé˜²çˆ†æ€§èƒ½æœ‰å…³çš„å›¾çº¸ã€‚ä¸Žé˜²çˆ†æ€§èƒ½æ— å…³çš„å›¾çº¸å¯ä¸é€æ£€ï¼Œä»¥ä¾¿æ›´å¥½åœ°ä¿æŠ¤åˆ¶é€ 厂的技术秘密。
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３６.附录Ｂ（æ示的附录） 
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Explosion-proof electrical equipment is in accordance with the requirements of GB 3836, and the explosion-proof markings of explosion-proof electrical equipment include:
Explosion-proof type + equipment category + (gas group) + temperature group 1 Explosion-proof type According to the explosion-proof measures taken, explosion-proof electrical equipment can be divided into explosion-proof type, increased safety type, intrinsically safe type, positive pressure type,
Oil immersion type, sand filling type, encapsulation type, n type, special type, dust explosion-proof type, etc. Their identification is shown in Table 1. 
Table 1 Explosion-proof basic types Explosion-proof type explosion-proof type signs Explosion-proof type explosion-proof type signs Explosion-proof type Ex d Sand-filled type Ex q
Increased safety type Ex e encapsulated Ex m
Positive pressure type Ex p n type Ex n
Intrinsically safe type E x iaEx ib special type Ex s
Oil-immersed Ex o dust explosion-proof DIP ADIP B
2 Equipment category
Electrical equipment for explosive gas environment is divided into: 
Class I: Electrical equipment used in underground coal mines;
Class II: Electrical equipment for other explosive gas environments other than coal mines. 
Class II flameproof "d" and intrinsically safe "i" electrical equipment are further classified into IIA, IIB, and IIC. 
Electrical equipment for flammable dust environment is divided into: 
Type A dusttight equipment; Type B dust tight equipment;
Type A dustproof equipment; Type B dustproof equipment. 
3 Gas group The explosive capacity of an explosive gas mixture indicates the degree of explosion hazard. The greater the explosive capacity of an explosive mixture, the higher the risk. The explosive capacity of an explosive mixture can be expressed by the safety gap of the large test. At the same time, the difficulty of igniting explosive gases, liquid vapors and mists also indicates the degree of explosion hazard. It is expressed by the small ignition current ratio of Zui. Class II explosion-proof electrical equipment or intrinsically safe electrical equipment is further classified into IIA, IIB and IIC according to its large test safety clearance or small ignition current ratio applicable to explosive gas mixtures.
As shown in table 2. 
Table 2 Relationship between the group of explosive gas mixtures and the safety gap of the Zui test or the small ignition current ratio of the Zui gas group Zui large test safety gap MESG (mm) zui small ignition current ratio MICR
IIA MESG≥0.9 MICR>0.8
IIB 0.9>MESG>0.5 0.8≥MICR≥0.45
IIC 0.5≥MESG 0.45>MICR
4 Temperature group The ignition temperature of an explosive gas mixture is the temperature limit at which it can be ignited. 
The electrical equipment is divided into T1 to T6 groups according to its high surface temperature, so that the high surface temperature of the corresponding electrical equipment of the T1 to T6 group cannot exceed the allowable value of the corresponding temperature group. The relationship between the temperature group, the surface temperature of the equipment, and the ignition temperature of the flammable gas or vapor is shown in Table 3. 
Table 3 Relationship between temperature group, equipment surface temperature and ignition temperature of flammable gas or vapor
Temperature level zuEN high surface temperature IECT[°C] igniting temperature of flammable substances [IECC GB 3836]
T1 450 T>450
T2 300 450≥T>300
T3 200 300≥T>200
T4 135 200≥T>135
T5 100 135≥T>100
T6 85 100≥T>8
5 Examples of explosion-proof signs
In order to further clarify the indication method of the explosion-proof mark, the gas explosion-proof electrical equipment is exemplified as follows:
For example, electrical equipment is Class I explosion-proof type: the explosion-proof mark is ExdI
If the electrical equipment is type II flameproof, the gas group is group B, and the temperature group is T3, the explosion-proof mark is: ExdIIBT3.
If the electrical equipment is type II intrinsically safe ia, the gas group is group A, and the temperature group is T5, the explosion-proof mark is: ExiaIIA T5. 
For type I special type: ExsI. 
For the explosion-proof electrical equipment used in the mine except for biogas, under normal circumstances, the Class II gas group is Group B, and the temperature group is T3 flammable gas, the explosion-proof mark is: ExdIIIBT3. 
In addition, the contents of the explosion-proof mark can be adjusted as appropriate for the following special circumstances:
(1) If the electrical equipment adopts more than one composite type, the main explosion-proof type shall be marked first, followed by other explosion-proof types. Such as: Class II Group B main body explosion-proof type and increased safety type junction box T4 group of motors, the explosion-proof mark is: ExdeIIBT4. 〖JP3〗
(2) If only electrical equipment in a flammable gas or vapour environment is permitted, the marking may be expressed by the chemical formula or name of the gas or vapour. In this case, it is not necessary to indicate the gas group and temperature group. . Such as: Class II explosion-proof electrical equipment used in ammonia environment, the explosion-proof mark is: ExdII (NH3) or ExdII (ammonia). 
Conversely, using Table 2, the manufacturer can determine the temperature group of the product according to the environment in which the explosion-proof electrical product is used, and design the surface temperature or internal temperature of the casing of the electrical device according to the temperature group. Users of explosion-proof electrical equipment can conveniently select the temperature group of explosion-proof electrical products according to the type of explosive gas or vapor that may appear in the site. For example, if isobutane is present in the environment (ignition temperature 460 °C), explosion-proof electrical products in the T1 group can be selected; if butane and diethyl ether are present in the environment (ignition temperature 160 °C), the T4 group must be selected. Explosion-proof electrical products. 
For dust explosion-proof electrical equipment: 
For type A equipment that can be used in Zone 21, the high surface temperature TA is 170 °C, and its explosion-proof mark is: DIP A21 TA170 °C or DIP A21TA, T3;
For type B equipment that can be used in Zone 21, the high surface temperature TB is 200 °C, and its explosion-proof mark is: DIP B21 TB200 °C or DIP B21TB, T3
6 Requirements for setting the mark (1) Marks should be placed in obvious places on the main part of the electrical equipment;
(2) The mark must be considered to be clear and durable in the presence of possible chemical corrosion. If the mark Ex, explosion-proof type, category, temperature group can be marked with convex or concave marks on the obvious part of the outer casing,
The material of the signboard should be chemically resistant, such as bronze, brass or stainless steel. 
7 Examples of explosion-proof electrical equipment signs commonly used in the world
Table 4
International Electrotechnical Commission (IEC) Ex d [ia] IIC T5 where: Ex - Explosion-proof d - Protection mode (explosion-proof type) [ia] - Intrinsically safe output associated equipment II - Equipment category C - Gas Group T5 - Temperature group 〖〗 CENELEC (European Electrotechnical Commission) EEx d [ia] IIC T5 where EEx - European flag d - protection mode (explosion-proof type) [ia] - intrinsically safe output association Equipment II - Equipment Category C - Gas Groups T5 - Temperature Group US (NEC 505) (USA)  Class I, Zone 1, A Ex d [ia] IIC T5 Where Class I - Permitted Category Zone 1 — permitted location A — US National Standard Ex — Explosion-proof d — Protection mode (explosion-proof type) [ia] — Intrinsic safety II — Equipment category C — Gas group T5 — Temperature group Do not US (NEC 500) (United States) Explosionproof with I. S. Outputs, ClÉ‘ss I , Division 1, Group A, B, C, D, T5 where: Explosionproof with I. S. Outputs — Protection mode (optional except Iî€S)ClÉ‘ss I — Allowed categories Division 1 — Levels allowed (other than level 2, optional) Groups A, B, C, D – allowed Gas Group T5 - Temperature Group
NEC is the American Electrical Code. In 1996, Chapter 505 was added to the US Electrical Code to harmonize with the hazardous area division method of the I EC standard system commonly used internationally. NEC 500 is indicated as suitable for the North American hazardous area division system.
Fourth, the safe use of explosion-proof electrical products should start from the correct classification of dangerous places
The safety of explosion-proof electrical products depends not only on the safety performance of the products, but also on the safe use of the products. The article focuses on the important basic work of the safe use of explosion-proof electrical products, namely the classification of dangerous places. 
1 The safe use of explosion-proof electrical products is as important as the safety performance of products. For a long time, China has been involved in the national standards for explosion-proof electrical safety, mainly the basic standards for explosion-proof electrical (manufacturing inspection standards based on GB 3836 series) and explosion-proof electrical products. standard. The main body of implementation of these standards is the product manufacturing enterprise and the quality inspection organization of explosion-proof electrical products. However, the use of explosion-proof electrical products in hazardous locations to ensure explosion-proof safety depends not only on the products that provide high explosion-proof safety in the design, manufacturing and inspection departments, but also on the safe use of the user departments of the products. Explosion-proof electrical products with the best performance and quality, if not used properly, can not only play an explosion-proof role, but may even become a terrible killer that threatens safety. Many painful explosions have proved this. For example, the rubber seal ring in the explosion-proof electrical product cable introduction device is an important part to maintain the explosion-proof performance of the product. This part is often neglected in use and cannot be properly selected, installed and maintained. For example, some users do not press it after repairing. Some of the selected seal rings and materials do not meet the standard requirements, and some do not install seals after maintenance. As a result, flammable gases in hazardous locations can enter the junction box cavity unimpeded. An arc occurs at the junction of the terminals in the junction box. When sparks, it is possible to ignite flammable gases and cause an explosion. Examples of such explosions that cannot be safely used with explosion-proof electrical products account for a large proportion of the total statistics of explosion accidents. 
It can be seen that the safe use of explosion-proof electrical products and the manufacturing quality that reflects the safety performance of explosion-proof electrical products are equally important. This is just like when we are sick, we usually need a doctor to carefully check the symptoms of our body and then guide us to take the right medicine. Quality-qualified drugs must be combined with proper use to achieve a safe and symptomatic treatment. Otherwise, it may be counterproductive—quality-qualified drugs can not only cure diseases safely, but may even endanger your health. 
We refer to the safe use of explosion-proof electrical products, generally including the following aspects: correctly classify the types of explosion hazardous areas; correctly select and install explosion-proof electrical products; properly maintain and repair explosion-proof electrical products. 
It can be seen from the above that explosion-proof electrical safety is a systematic project, including the design, manufacture, inspection, classification of dangerous places, selection and installation of explosion-proof electrical products, maintenance and repair, and quality management and personnel related to this. Training and other aspects. Any negligence in any link can be a hidden danger of an explosion. 
It is true that many user departments also recognize the importance of the safe use of explosion-proof electrical products to ensure the safety of explosion-proof, but it has not been a long-term national standard to follow, so it can only be based on experience and some incomplete information. Some departmental standards and specifications to implement technical production management for the safe use of explosion-proof electrical products. Therefore, the formulation of a complete set of national standards that can be in line with international standards as soon as possible has always been an urgent concern of all parties. 
In recent years, with the development of China's explosion-proof electrical standardization work and the need to strengthen the integration with international standards, China's explosion-proof electrical standards have also evolved from the past product manufacturing inspection standards to manufacturing inspection, site division, and selection. Complete explosion-proof electrical safety standard system consisting of standards such as installation and maintenance. "Classification of dangerous places (GB 3836î€ 14-2000)", "Electrical installation of hazardous places (GB 3836î€15-2000)", Maintenance of electrical equipment for explosive gas atmosphere (GB 3836î€13-1997)" * In the form of national standards, the technical and management requirements for the safe use of explosion-proof electrical products by the user department are completely defined, which is of great significance for the safe production of explosive hazardous areas. In addition, due to the implementation of these three standards and international standards In order to meet the requirements, it has also created favorable conditions for China's petrochemical plants to enter the international market and to do a good job in the explosion-proof safety production and technical management of imported equipment.
2 Hazardous Location Classification is an important basic work for the safe use of explosion-proof electrical products. The above three standards for the user department, the primary, Zui-based work is the classification of the explosion hazardous areas involved in this department. This is just like a patient who visits a doctor. First, it must be diagnosed by a comprehensive examination and a doctor's analysis of the symptoms. Accurate diagnosis is the basis for symptomatic treatment and safe medication. This article is devoted to the analysis of the national standard “Classification of Hazardous Locations†(GB 3836î€14-2000). 
2.1 Purpose of Classification of Hazardous Locations Classification of hazardous locations is a method of analyzing and classifying sites where explosive atmospheres may occur. The purpose of site classification is to provide sufficient safety and economical efficiency for the selection and installation of explosion-proof electrical equipment used in such explosive hazardous locations. Because in hazardous locations where flammable substances are used, it is difficult to ensure that an explosive atmosphere never occurs. Also, it is difficult to ensure that electrical equipment used in hazardous locations is never a source of ignition. Therefore, a place with high risk (ie, a place where there is a high possibility of an explosive gas atmosphere) should select a type of explosion-proof electrical equipment with high safety performance. Conversely, for locations where there is less risk (ie, where the possibility of an explosive gas atmosphere is less likely), an explosion-proof electrical equipment type that has a slightly lower safety (but still has sufficient safety) and is relatively inexpensive can be selected. 
2.2 Main contents of classification of dangerous places There are two main aspects of classification of dangerous places:
(1) Divide the hazardous area into three areas based on the frequency and duration of the explosive gas environment.
Zone 0: a place where an explosive gas environment continuously appears or exists for a long time;
Zone 1: a place where an explosive atmosphere may occur during normal operation;
Zone 2: In normal operation, an explosive atmosphere is unlikely to occur, if it occurs, it happens occasionally, and it is only a place that exists for a short time. 
(2) Determine the quantity and range of hazardous locationså˜åœ¨
Because it is not enough to determine the type of the area of ​​a dangerous place, it is necessary to determine the quantity of such dangerous places in and around the equipment, and to determine the spatial extent of each type of dangerous place, that is, to determine the spatial extent of the place. Accurate quantification. 
2.3 Basic safety principles for classification of hazardous locations (1) When designing equipment and devices for handling or storing flammable substances, the categories of dangerous places should be made as small as possible, especially in areas 0 and 1 The number and scope of the districts have become small, that is, as far as possible, most of the dangerous places have become the two districts. 
(2) Equipment used in the process shall be mainly a level 2 release source. If this requirement is not met, the release source should also be released into the air in a very limited amount and release rate. 
(3) After the category of the dangerous place is determined, it is not allowed to change it at will. For the repaired process equipment, it must be carefully checked to confirm whether it can guarantee the safety level of the original design. 
2.4 Ideas for Classification of Hazardous Locations As defined by the definition of a hazardous location, a hazardous location is an area where an explosive atmosphere occurs or is expected to be in an amount sufficient to require special safety precautions for the construction, installation and use of electrical equipment. 
It can be seen from the definition that it is judged whether the place is a dangerous place, mainly according to whether the place may have an explosive gas environment, and the condition of the explosive gas environment is whether the concentration range of the flammable gas is within the explosion limit range. The concentration of flammable gas in the air is within the limits of this explosion limit (ie, the lower explosion limit and the upper explosion limit), and an explosion can be formed in the event of an ignition source; if it exceeds this range, a strong ignition source cannot be used to excite the explosion. That is to say, any mixture whose concentration is lower than the lower explosion limit or higher than the upper explosion limit will not cause the flame to propagate spontaneously when it comes into contact with the ignition source. When the concentration is lower than the lower explosion limit, excessive air is involved in the combustion reaction as an inert medium, which consumes a part of the heat of reaction and acts as a cooling agent to prevent the flame from self-propagating. On the contrary, when the concentration is higher than the upper limit of the explosion, the amount of air is excessive due to the combustibles. Insufficient, resulting in incomplete chemical reactions, the heat released by the reaction is less than the loss of heat, and thus hinder the spread of flame. 
It can be seen from the above that the quantity of flammable gas in the site is the key to determining the risk of the site, and the occurrence of flammable gas in the site mainly depends on the flammable gas release source and the ventilation condition that affects the accumulation of flammable gas. Therefore, we can come up with such a solution to the problem: the location is classified according to its risk--the danger of the site depends on the amount of explosive gas environment in the site--the explosive gas environment is the number of flammable gases. That is, the limit of the explosion limit - the amount of flammable gas present depends on the ventilation of the source and location. 
2.5 Method of site classification The core issue of site classification method is the analysis of the basic probability of explosive gas environment in the site, which requires the research and participation of experienced professionals. At the same time, it is necessary to accumulate and collect the operation of each device in the site. Information on conditions and environmental factors. Therefore, site classification should be determined by professionals familiar with the performance, equipment and process conditions of flammable substances and those engaged in safety, electrical and other related engineering and technical personnel. The specific method is as follows:
(1) Find and determine the source of release
The presence of flammable gases or vapours in the site may create an explosive atmosphere. Therefore, it is first necessary to find out whether the storage equipment, processing equipment or conveying pipeline containing flammable substances in the place may release flammable gas or vapor into the place, or whether the air may enter the container and mix with flammable gas or vapor to form an explosive property. mixture. 
Every piece of equipment (such as tanks, pipes, pumps, compressors, etc.) should be considered a potential source of release if it contains flammable substances inside. If they are unlikely to contain flammable substances, it is clear that they will not form an explosive mixture around them. If such equipment contains flammable substances but cannot escape or leak into the site, it may not be regarded as a source of release (for example, a seamless pipe placed in a certain space). 
If it has been confirmed that the device releases flammable substances into the site, the release frequency and duration should be determined first, and the level of the release source should be determined accordingly:
1) Continuous release source: a release source that is continuously released or is expected to be released over a long period of time. 
For example, the upper tank space and exhaust port of the fixed roof; the vicinity of the liquid surface of the open flammable liquid container shall be regarded as a continuous-stage release source.
2) Level 1 release source: A release source that is expected to be released periodically or occasionally during normal operation. 
For example, in normal operation, the seal of the pump, compressor or valve that is expected to release flammable substances to the surrounding area; the drain on the container containing the flammable liquid; during normal operation, it is expected that flammable substances may be released to the surroundings. Sampling points in the site; during normal operation, pressure relief valves, vents, or other openings that are expected to release flammable substances should be considered a Class 1 release source. 
3) Level 2 release source: It is not expected to be released during normal operation, and if released, it is only a release source for occasional and short-term release. 
For example, in normal operation, it is impossible to leak the seal of the compressor or valve; in normal operation, it is impossible to leak the flange, connecting piece or pipe joint; in normal operation, it is impossible to release the sampling of flammable substances to the surrounding place. Points and so on should be considered as Level 2 release sources. 
(2) Determining the type of area of ​​the hazardous area
The type of area in which the hazardous area is divided is mainly based on the release source level and ventilation conditions in the location. 
In general, the continuous-stage release source forms a hazardous area in Zone 0; the Level 1 release source forms a Zone 1 hazardous location; and the Level 2 release source forms a Zone 2 hazardous location. 
At the same time, the area division should be determined according to the ventilation conditions. If the ventilation is good, the area category of the hazardous area can be reduced. Conversely, if the ventilation is poor, the area category of the hazardous area can be improved. This is because the flammable gas or vapor released into the surrounding area will flow or diffuse by means of ventilation to dilute its concentration below the lower explosion limit. 
(3) Determining the area of ​​the hazardous area
There are many factors affecting the release rate of flammable gases or vapors, the lower explosion limit of gas, relative density, and ventilation conditions, etc., so the impact of their impact on the area of ​​the hazardous area should be determined. 
2.6 Factors affecting the area of ​​hazardous areas
(1) Rate of release of flammable substances
The greater the release rate, the greater the amount of flammable material released into the surrounding area per unit time, and the greater the range of the hazardous area.
(2) Lower explosion limit
For a certain amount of release, the lower explosion limit is reduced, and the amount of the explosive gas mixture whose concentration reaches above the lower explosion limit is correspondingly increased, and the range of the dangerous area is correspondingly increased. 
(3) Relative density of gas or vapour
If the relative density of the gas or vapor is less than that of air, then the gas and vapor lighter than the air will flow upwards, so that the range of dangerous areas in the vertical direction above the release source will increase as the relative density decreases; if gas or vapor Relatively denser than air, gases or vapors that are heavier than air tend to deposit on the ground, so that near the ground, the horizontal extent of the hazardous area will increase as the relative density decreases. 
(4) Ventilation
Increase the amount of ventilation to narrow the range of hazardous areas. This is because ventilation can blow off or dilute the flammable gases or vapors leaking from the site, reducing the range of hazardous areas. If the ventilation effect is good, the ventilation air volume is large enough, and the ventilation is continuous, for example, there is a spare fan, etc., the area category of the dangerous place can be reduced. 
In addition, obstacles around the release source can affect the ventilation effect and expand the range of the hazardous area. On the other hand, if obstacles (such as dams, walls, ceilings, etc.) can block the further diffusion of flammable gases or vapors to the surroundings, the obstacles can limit the extent of the dangerous areas to further extend to the periphery. 
The effects of different ventilation conditions on the extent of the hazardous area can be analyzed as follows:
1) Natural ventilation and overall forced ventilation
As described above, although the continuous-stage release source usually forms a zero-zone site, the first-order release source forms a zone 1 site, and the level 2 release source forms a zone 2 site. However, the actual production site is much more complicated due to the influence of ventilation. For example, good ventilation may make the area of ​​a hazardous area too small to be neglected and may become a less dangerous area. If the ventilation is particularly good, it may become a non-hazardous place. Conversely, if ventilation is poor, it may expand the area of ​​the hazardous area and may become a more dangerous area. 
2) When local forced ventilation
In general, the use of local forced ventilation to dilute explosive mixtures is better than natural ventilation and overall forced ventilation. As a result, the area of ​​the hazardous area is reduced or even reduced to a negligible level. It may become a less dangerous area category. It has even become a non-hazardous place. 
3) When there is no ventilation
When there is a release source in a non-ventilated place, the continuous-stage release source will definitely form a zero-zone place, the first-order release source may also form a zero-zone place, and the second-order release source may also form a 1-zone place. However, in special cases, such as when the amount of release is extremely small or when monitoring is released, it may also be made a less dangerous category. 
4) When obstacles restrict ventilation
If an obstacle in a hazardous area affects ventilation, it will expand the scope of the hazardous area or make it a more dangerous category. When considering the influence of obstacles, special attention should be paid to the relative density of gas or vapor in pits and recesses. 
5) When the ventilation device fails 
The classification of dangerous places is premised on the normal operation of the ventilation device. If the hazard in the event of a malfunction of the ventilation unit is negligible (if an automatic standby system is additionally provided), it is not necessary to change the classification of the hazardous location as determined by the proper operation of the ventilation unit. However, if the risk of failure of the ventilation unit cannot be ignored, the extent of expansion of the explosive mixture without forced ventilation should be predicted, and the frequency and duration of failure of the ventilation unit should be predicted, and the type of the location should be determined accordingly. 
If the ventilation unit does not malfunction or is short-lived even if it is faulty, the dangerous area that has been expanded due to the failure of the ventilation unit should be designated as the area 2 area. 
If measures can be taken to prevent the release of flammable substances in the event of a malfunction of the ventilation device (for example, the process is automatically stopped), it is not necessary to change the originally determined site classification. 
6) Other conditions
Other factors such as climatic conditions, topography, etc. can also affect the extent of the explosion hazard area. In summary, the following should be noted when determining the hazardous area:
Gases or vapors that are heavier than air may flow into spaces below the ground, such as grooves and trenches; gases or vapors that are lighter than air may remain in high spaces, such as roof space; if the source of release is outside the shop or near the site Measures should be taken to prevent a large amount of flammable gases or vapors from entering the workshop or site; the condition of ventilation has a great influence on the range of explosion-hazardous places, and great care should be taken when dividing the area. 
2.7 According to the classification of dangerous places and the classification of dangerous places, determine the category and scope of the site. At the production site, only the rough review of the design of the complete set of equipment or complete sets of equipment, the parts around the equipment are determined to be almost zero, 1 or 2 It is impossible, and the various possibilities of explosive mixture formation must be carefully analyzed. 
In order to determine the frequency of release of flammable substances, release time, release rate, concentration, ventilation and other factors affecting the type and scope of the hazardous area, it is necessary to carry out the process flow of the flammable substances that may form the release source one by one. Careful study and analysis. The National Standard GB 3836.14—2000 “Electrical Equipment for Explosive Atmospheres Part 14: Classification of Hazardous Locations†gives the suggestive appendix of “Hazardous Location Classification Schematic†and “Hazardous Location Division Exampleâ€. The method provides practical help. However, some examples of dangerous area ranges given in the standard are divided under certain conditions, and the conditions for their use should be noted. The examples given in the standard are only indicative examples. To use the examples in the standard for actual site classification, special details of the actual environment and various situations must be considered. For example, the division of hazardous areas of oil well facilities is Refers to the determination in general. If the oil pressure or air pressure of the well is very high, the corresponding range of the hazardous area will expand. In addition, in each case, only some influencing parameters are given, not all. In general, considering that these factors are specified, and some are qualitative rather than quantitative, the classification results are more conservative. That is to say, if it is possible to specify the operating parameters more closely, a more accurate site classification result will be obtained.  
V. Changes in general requirements for new gas explosion-proof standards GB3836.1-2000 "General requirements for electrical equipment for explosive gas atmospheres" has been officially promulgated by the State Bureau of Technical Supervision. The revision of this standard has always been a matter of great concern to all. The main revisions are as follows:
According to the provisions of “Using International Standards and Foreign Advanced Standards Management Measures†and relevant national technical policies, the revision of this standard closely follows the revision dynamics of international standards, equivalent to the IEC60079-0:1998 standard. In the main technical content and writing method, there are only minor differences in technology. These differences are in the form of “notes†(footnotes or notes), and the appendix is ​​added when there is more content.
I. Main differences between GB3836.1-2000 (hereinafter referred to as this standard) and IEC60079-0:1998 (hereinafter referred to as IEC standard) There are two articles and three appendices in total. That is, Article 8.3, the IEC standard provisions are "The provisions of 8.1 do not apply to Class I portable measuring instruments." However, China's standards have been stipulated for Class I portable or bracket type electric drills, portable instruments and lamps, and many years of practice have proved to be safe and feasible. In recent years, China has also established the national standard GB13813, which is evaluated by the friction spark test method. Therefore, this standard specifies the portable instruments that are not specified in the IEC standard to facilitate the design, manufacture and inspection of such products. Another example is the note in Article 27.1. The IEC standard has only the text and no notes. However, how to consider ensuring that “there may be “clear and durable†in the case of possible chemical corrosion, there will be different understandings in the implementation. In order to unify understanding, according to the requirements of Chinese standards for signs, in the form of notes, the standard in China The relevant requirements are valid and further explained “clearness and durabilityâ€.
"Appendix A: Inspection Procedures". The IEC standard has no specific provisions for inspection procedures. In order to meet the needs of China's explosion-proof electrical products inspection work, Appendix A has been added.附录 “Appendix C: Moisture Requirements for Class I Electrical Equipmentâ€. The IEC standard does not specify the moisture-proof requirements for Class I electrical equipment, and the user and the manufacturer shall determine the corresponding measures. According to the special requirements of coal mines in China, specific requirements for moisture prevention are put forward, and the test methods and the number of cycles are specified.
“Appendix E: Special Requirements for Plastic Cases for Class I Electrical Equipmentâ€. There is no such requirement in the IEC standard. According to the special requirements of coal mines in China, the plastic casing of Class I electrical equipment should have flame retardant properties. The specific test methods and requirements are specified in Appendix C. 
The IEC standard is in the process of considering the mining helmet lamp standard. In order to adapt to the production, inspection and use of mine helmet lights in China, this standard temporarily adopts the provisions of China's standard GB7957.
The above is the difference between this standard and the IEC standard, and the rest are equivalent to the IEC standard. 
Second, the difference between this standard and GB3836.1-83 (hereinafter referred to as the original standard) Standard Name The standard name is changed from "explosive environmental explosion-proof electrical equipment" to "explosive gas environmental electrical equipment" to distinguish it from explosive dust environment. This standard cancels the provisions of the "Article" in the preparation method. 
2. Explosion-proof type 
"Spark-free electrical equipment n" and "airtight electrical equipment h" have been eliminated in the explosion-proof type of special standard. Because the "n" type may not meet the requirements of this standard, it is an explosion-proof electrical equipment that does not consider the safety factor, and can only be applied to a safer place in Zone 2. The "h" type standard is formulated in accordance with the requirements of the sealing device in the IEC79 [CD1] 15 "n" type electrical equipment. As the "n" type standard is equivalent or equivalent to the IEC79-15 standard, the "h" type will be cancelled. This standard adds provisions for mining helmet lights. 
3. Reference Standards Where the Chinese standard is equivalent or equivalent to the IEC and ISO standards, the Chinese standard is adopted. According to the relevant provisions of the international standards, China's standards are not equivalent or equivalent to the IEC and ISO standards, and all international standards are directly adopted to promote the revision of these standards as soon as possible equivalent to or equivalent to international standards. 
The IEC and ISO standards directly quoted in the standard are cited in the standard provisions, and none of these standards are equivalent or equivalent to the Chinese standards. Therefore, the IEC and ISO standards are directly quoted. 
4. Definitions and Symbols Compared with the original standard, the "explosive electrical equipment for explosive atmospheres" was revised as "electrical equipment" and the "explosive gas mixture" was "explosive gas environment". The definitions of “special fastenersâ€, “guardsâ€, “sinking holesâ€, “prototypes†and “samplesâ€, “temperature groups†have been removed. Added "operating temperature", "zui high operating temperature", "rated value", "rated", "Ex cable entry device", "compression element", "clamping device", "wiring cavity", "connection Definitions of "," "Ex component", "symbol X", "symbol U", etc. Among them, "Ex cable introduction device" and "Ex component" are a relatively new concept. The Ex cable entry device is a cable entry device that is individually tested and forensic and installed with the device housing without the need for a certificate. According to international practice, the cable entry device can be removed from the device housing as a separate device and is a specialized standard part. It can be connected to the equipment casing by means of threads, holes, etc. The introduction device complies with the provisions of Appendix D of this standard or Appendix B of IEC60079-0. In China, the general cable entry devices are cast or welded together with the equipment casing. Cannot be used as a specialized standard component. Similarly, the Ex component is an explosion-proof component that cannot be used alone. It can be obtained separately, but the explosion-proof certificate number is followed by the symbol U.å½“å®ƒä¸Žå…¶ä»–ç”µæ°”è®¾å¤‡æˆ–ç³»ç»Ÿä¸€èµ·ä½¿ç”¨æ—¶éœ€é™„åŠ è®¤è¯ï¼Œå³éœ€å¦å¤–å–è¯ã€‚ ï¼¥x元件应符åˆæœ¬æ ‡å‡†é™„录Ｆ或ＩＥＣ６ï¼ï¼ï¼—９—ï¼é™„录Ｃ的规定。 
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塑料外壳或外壳部件的zui高表é¢æ¸©åº¦è‡³å°‘应比对应２ï¼ï¼ï¼ï¼ï½ˆç‚¹çš„温度指数ＴI低２ï¼K。并且还应能ç»å—è€çƒã€è€å¯’è¯•éªŒçš„è€ƒæ ¸ã€‚î€„
对移动å¼å¯èƒ½è¢«æ‘©æŽ§æˆ–擦æ‹å¡‘料部件的固定å¼ç”µæ°”设备，应设计为æ£å¸¸ç»´æŠ¤å’Œè¿›è¡Œæ¸…æ´æ—¶èƒ½é˜²æ¢äº§ç”Ÿå¼•ç‡ƒå±é™©çš„é™ç”µç”µè·çš„结构。ä¸èƒ½é˜²æ¢æ—¶åº”用è¦å‘Šç‰Œè¯´æ˜Žè¿è¡Œä¸é¡»é‡‡å–的安全措施。
â… ç±»ç”µæ°”è®¾å¤‡å¡‘æ–™å¤–å£³çš„è¡¨é¢å¤§äºŽï¼‘ï¼ï¼ï½ƒï½î€‹ï¼“时，按照２３．４．７．８在特定æ¡ä»¶ä¸‹ï¼»æ¸©åº¦ï¼ˆï¼’３±２）℃相对湿度（５ï¼Â±ï¼•ï¼‰ï¼…］，测得的表é¢ç»ç¼˜ç”µé˜»ä¸åº”è¶…è¿‡ï¼‘ï¼§Î©ã€‚æ¸©åº¦æ ‡å¿—å¯ä¼˜å…ˆæŒ‰è¡¨1æ ‡å‡ºæ¸©åº¦ç»„åˆ«ï¼Œæˆ–æ ‡å‡ºzui高表é¢æ¸©åº¦ï¼Œæˆ–äºŒè€…éƒ½æ ‡å‡ºã€‚î€„
Ⅱ类电气设备除通过åˆç†é€‰æ达到上述è¦æ±‚外（表é¢ç”µé˜»ä¸è¶…过１ＧΩ），还å¯é€šè¿‡é™å®šå¡‘料外壳和外壳部件的zui大表é¢é¢ç§¯æ¥è¾¾åˆ°ï¼ˆâ…¡ï¼¡ã€â…¡ï¼¢ç±»ç”µæ°”设备ä¸å¾—超过１ï¼ï¼ï½ƒï½î€‹ï¼’，如塑料裸露部分用接地金属框架围ç€ï¼Œå¯ä¸è¶…过４ï¼ï¼ï½ƒï½î€‹ï¼’；ⅡＣ类电气设备包括é€æ˜Žä»¶ä¸å¾—超过２ï¼ï½ƒï½î€‹ï¼’ï¼Œå¦‚å¡‘æ–™éƒ¨ä»¶æœ‰é™„åŠ é˜²é™ç”µç”µè·æŽªæ–½ï¼Œå¯å¢žè‡³ï¼‘ï¼ï¼ï½ƒï½î€‹ï¼’）。也å¯é€‰æ‹©åˆç†å°ºå¯¸ã€å½¢çŠ¶å’Œå¸ƒç½®ï¼Œæˆ–采å–其他安全措施æ¥è¾¾åˆ°ã€‚如ä¸èƒ½é€šè¿‡å¤–壳的设计æ¥é¿å…产生引燃å±é™©é™ç”µç”µè·æ—¶ï¼Œåˆ™åº”设一个è¦å‘Šç‰Œæ ‡æ˜Žåœ¨è¿è¡Œä¸é‡‡ç”¨çš„安全措施。
应该注æ„的是在选择电气ç»ç¼˜æ料时，应考虑其zuiå°è¡¨é¢ç»ç¼˜ç”µé˜»ï¼Œä»¥é˜²æ¢å¡‘料部件碰触带电件而产生的问题。用于有爆炸性气体长时间æŒç»å˜åœ¨çš„场所（如ï¼åŒºåœºæ‰€ï¼‰çš„塑料外壳部件还应有更进一æ¥çš„é™åˆ¶ã€‚
ä¸Žï¼©ï¼¥ï¼£æ ‡å‡†ç›¸æ¯”å¢žåŠ äº†â€œâ… ç±»ç”µæ°”è®¾å¤‡å¡‘æ–™å¤–å£³åº”å…·æœ‰é˜»ç‡ƒæ€§èƒ½çš„è¦æ±‚，具体规定è§é™„录Ｅ。å³æŒ‰ï¼§ï¼¢ï¼‘１ï¼ï¼’ï¼ï¼¦ï¼¶æ³•è¯•éªŒä¸ä½ŽäºŽï¼¦ï¼¶ï¼’çš„è¦æ±‚，以适应我国煤矿井下特殊情况的需è¦ã€‚
å…许在塑料外壳上攻螺å”，åªè¦èžºçº¹å½¢çŠ¶é€‚åˆäºŽå¡‘æ–™æ质，满足防爆型å¼ä¸“ç”¨æ ‡å‡†è¦æ±‚å³å¯ã€‚
ï¼™.å«è½»é‡‘属的外壳 æœ¬æ ‡å‡†å¯¹åŽŸæ ‡å‡†çš„å称“轻åˆé‡‘外壳â€è¿›è¡Œäº†ä¿®è®¢ï¼Œå«ä¹‰ä¹Ÿæœ‰æ‰€ä¸åŒã€‚â… ç±»ç”µæ°”è®¾å¤‡å¤–å£³æ料的é“ã€é’›å’Œé•çš„总å«é‡ï¼ˆæŒ‰è´¨é‡ç™¾åˆ†æ¯”）ä¸å…许大于１５％，且钛和é•çš„总å«é‡ä¸å…许大于６％，Ⅱ类电气设备外壳æ料的å«é•é‡ï¼ˆæŒ‰è´¨é‡ç™¾åˆ†æ¯”）ä¸å…许大于６％。ä¸åŒäºŽåŽŸæ ‡å‡†åªè§„定å«é•é‡ä¸å¤§äºŽï¼ï¼Žï¼•ï¼…和抗拉强度ä¸ä½ŽäºŽï¼‘ï¼’ï¼ï¼ï¼°ï½çš„规定。
â… ç±»æºå¸¦å¼ä»ªè¡¨ï¼©ï¼¥ï¼£æ ‡å‡†æœªåšè§„å®šï¼Œæˆ‘å›½åŽŸæ ‡å‡†å¯¹â… ç±»æºå¸¦å¼ç”µé’»ã€ä»ªè¡¨å’Œç¯å…·ç‰çš„外壳已有规定，多年的实践è¯æ˜Žæ˜¯è¡Œä¹‹æœ‰æ•ˆçš„。对于å«é•é‡çš„问题近年æ¥æœ‰äº›äº‰è®®ï¼Œæ•…æœ¬æ ‡å‡†é™¤é‡‡ ç”¨ï¼©ï¼¥ï¼£çš„è§„å®šå¤–ï¼Œè¿˜å¢žåŠ äº†å…许用ＧＢ１３８１３规定的摩擦ç«èŠ±è¯•éªŒæ–¹æ³•è€ƒæ ¸å«è½»é‡‘属的æ料的安全性的规定。
å«è½»é‡‘属的外壳也å…许攻螺å”，åªè¦èžºçº¹å½¢çŠ¶é€‚åˆäºŽå¤–壳所用æ料，并满足相应防爆型å¼ä¸“ç”¨æ ‡å‡†çš„è¦æ±‚å³å¯ã€‚
１ï¼.紧固件
一般电气设备的紧固件åªå…许用工具æ‰èƒ½æ¾å¼€æˆ–拆除。对“防æ¾è£…ç½®â€ä¸åšè§„定，需è¦æ—¶ç”±å„防爆型å¼ä¸“ç”¨æ ‡å‡†è§„å®šã€‚î€„
å«è½»é‡‘属的外壳的紧固螺钉å…许用轻金属或塑料制æˆï¼Œåªè¦ç´§å›ºä»¶æ料适用于外壳æ料，满足防爆形å¼ä¸“ç”¨æ ‡å‡†çš„è¦æ±‚å³å¯ã€‚
特殊紧固件的è¦æ±‚ä¸ŽåŽŸæ ‡å‡†æœ‰è¾ƒå¤§ä¸åŒã€‚åŽŸæ ‡å‡†ç‰¹æ®Šç´§å›ºä»¶æ˜¯æŒ‡å°†èžºæ “å¤´æ”¾å…¥å‡¹çªæˆ–沉å”ä¸ï¼Œåªèƒ½ç”¨ä¸“用工具æ‰èƒ½æ‰“开。这次修订对凹çªå’Œæ²‰å”åªçœ‹åšä¿æŠ¤æŽªæ–½ï¼Œç‰¹æ®Šç´§å›ºä»¶çš„è¦æ±‚为：螺è·ç¬¦åˆï¼§ï¼¢ï¼™ï¼‘４４，公差é…åˆç¬¦åˆï¼§ï¼¢ï¼™ï¼‘ï¼”5的６ｇï¼ï¼–Ｈé…åˆï¼›èžºæ “或螺æ¯ç¬¦åˆç›¸åº”æ ‡å‡†çš„è¦æ±‚；电气设备的å”符åˆä»¥ä¸‹è¦æ±‚：（１）电气设备上的螺å”深度应大于ç‰äºŽç›¸åº”è§„æ ¼èžºæ¯çš„高度；（２）螺纹公差符åˆï¼§ï¼¢ï¼™ï¼‘ï¼”ï¼•çš„ï¼–ï¼¨çº§ï¼Œä¸”èžºæ “å¤´ä¸‹é¢çš„å”ä¸Žèžºæ “é—´éš™ä¸å¤§äºŽï¼©ï¼³ï¼¯ï¼’８６—２ä¸ï¼¨ï¼‘３公差，细æ†èžºæ “头下é¢çš„å”应玫ä¸ï¼Œèžºæ “头与被连接件的接触é¢ç§¯åº”大于或ç‰äºŽéžç»†æ†èžºæ “的接触é¢ç§¯ï¼›ï¼ˆï¼“）内å…è§’èžºæ “èžºçº¹å…¬å·®ç¬¦åˆï¼§ï¼¢ï¼™ï¼‘４５ä¸ï¼–Ｈ级，紧固åŽèžºæ “ä¸å¾—从螺å”ä¸å‡¸å‡ºã€‚
１１.è”é”装置
è”é”装置在结构上应ä¿è¯ç”¨éžä¸“用工具ä¸èƒ½è½»æ˜“解除其作用，è”é”解除å‰ä¸èƒ½ç ´å其防爆型å¼ã€‚
１２.ç»ç¼˜å¥—管
ç»ç¼˜å¥—管应安装牢固并ç»å—æ‰è½¬è¯•éªŒè€ƒæ ¸ã€‚å–æ¶ˆäº†åŽŸæ ‡å‡†â€œç”¨å¸æ¹¿æ€§è¾ƒå°çš„æ料制æˆâ€çš„è¦æ±‚。
１３.粘接æ料
粘接æ料应有足够的çƒç¨³å®šæ€§ï¼Œå…¶æžé™æ¸©åº¦å€¼åº”超过电气设备的zui高温度至少２ï¼ï¼«ã€‚
ä¸ŽåŽŸæ ‡å‡†ç›¸æ¯”å–消了“zui低为１２ï¼â„ƒâ€çš„规定，主è¦ä»¥ç²˜æŽ¥ææ–™æžé™æ¸©åº¦é«˜äºŽç”µæ°”设备zui
高温度２ï¼ï¼«ä¸ºä¾æ®ï¼Œæ”¾å®½äº†ä½¿ç”¨çš„粘接æ料范围。åªè¦åˆ¶é€ 厂å‘检验å•ä½æ供足够的è¯æ®è¯´æ˜Žç¬¦åˆä¸Šè¿°è¦æ±‚，检验å•ä½ä¸å†è¿›è¡ŒéªŒè¯è¯•éªŒî€„
粘接æ料若承å—ä¸åˆ©è¿è¡Œæ¡ä»¶ï¼Œç”±åˆ¶é€ 厂和用户å商解决措施。
１４.Ｅｘ元件 Ｅｘ元件是ç‰åŒï¼©ï¼¥ï¼£æ ‡å‡†è€Œå¢žåŠ 的一新概念。Ｅｘ元件å³é˜²çˆ†å…ƒä»¶ï¼Œå®ƒå¯å•ç‹¬å–è¯ï¼Œä½†é˜²çˆ†åˆæ ¼è¯ç¼–å·åŽåŠ “Ｕâ€ç¬¦å·ï¼Œä»¥è¡¨æ˜Žå…¶ä¸ºï¼¥ï½˜å…ƒä»¶ã€‚它ä¸èƒ½å•ç‹¬ä½¿ç”¨ï¼Œå’Œå…¶ä»–电气设备或系统一起使用时，须和其他电气设备一起é‡æ–°è¿›è¡Œè¡¥å……检验认è¯ã€‚
Ｅｘ元件应满足附录Ｆ的规定，Ｅｘ元件å¯ä»¥æ˜¯ç©ºå¤–壳。或与设备一起使用。并符åˆï¼‘．２所列一个或多个防爆型å¼çš„规定。Ｅｘ元件å¯å®‰è£…在设备外壳内ã€å¤–壳外，或部分在外壳内部分在外壳外。安装在外壳内的Ｅｘ元件，å•ç‹¬ä¸èƒ½æ£€éªŒçš„部分，安装åŽä»è¦è¿›è¡Œæ£€éªŒã€‚如元件的表é¢æ¸©åº¦ï¼Œç”µæ°”间隙爬电è·ç¦»ç‰ã€‚安装在外壳外ã€æˆ–部分在内ã€éƒ¨åˆ†åœ¨å¤–的Ｅｘ的元件，与外壳的接åˆé¢åº”符åˆæœ‰å…³é˜²çˆ†åž‹å¼çš„规定，并进行机械（冲击）试验。
１５.连接件和接线空腔 ä¸ŽåŽŸæ ‡å‡†ç›¸æ¯”å–消了采用永久引入电缆的é™åˆ¶ï¼Œä½†å¯¹æ‰€æœ‰é‡‡ç”¨æ°¸ä¹…引入电缆的设备å‡åº”在防爆åˆæ ¼è¯å·åŽåŠ “Ｘâ€ç¬¦å·ã€‚ä»¥è¡¨æ˜Žæ°¸ä¹…ç”µç¼†çš„è‡ªç”±ç«¯åº”æœ‰é€‚å½“çš„æŽªæ–½åŠ ä»¥ä¿æŠ¤ã€‚
接线空腔符åˆï¼‘．２所列一ç§é˜²çˆ†åž‹å¼ã€‚电气设备应设连接件与外部电路相连。接线空腔和出线å£åº”有足够尺寸以方便导线连接。并使电气间隙爬电è·ç¦»ç¬¦åˆç›¸åº”防爆型å¼æ ‡å‡†çš„规定。
１６.接地连接件 ä¸ŽåŽŸæ ‡å‡†ç›¸æ¯”æŽ¥åœ°è¿žæŽ¥ä»¶çš„è§„æ ¼ä¿®è®¢ä¸ºå†…æŽ¥åœ°ä¸Žå¤–æŽ¥åœ°çš„è¿žæŽ¥ä»¶è§„æ ¼ç›¸åŒã€‚外接地连接件还应与至少截é¢ç§¯ä¸ºï¼”ï½ï½î€‹ï¼’的接地线有效连接。
电气设备应设内接地和外接地连接件。内外接地应有电气上的连接（ä¸ä¸€å®šæœ‰å¯¼çº¿è¿žæŽ¥ï¼‰ã€‚特殊情况下（åŒé‡ç»ç¼˜ã€åŠ 强ç»ç¼˜ã€å®‰è£…在金属导管系统上）å¯ä¸è®¾å†…外接地连接件。连 接件应有防è…措施。结构上应能防æ¢å¯¼çº¿æ¾åŠ¨ã€æ‰è½¬ï¼Œèƒ½æŒä¹…ä¿æŒæŽ¥è§¦åŽ‹åŠ›ã€‚与轻金属连接时，须采å–特殊预防措施（如应用钢质过渡件）。
１７.电缆和导管引入装置
åˆ¶é€ åŽ‚åœ¨æ供给检验å•ä½çš„文件ä¸åº”指明引入电缆或导管的ä½ç½®å’Œzui大å…许数é‡ã€‚
引入装置一般åšä¸ºå•ç‹¬çš„部件进行试验和å‘è¯ï¼Œä¹Ÿå¯ä¸Žè®¾å¤‡ä¸€èµ·è¯•éªŒå’Œå‘è¯ã€‚
引入装置还应符åˆé™„å½•ï¼¤çš„è§„å®šã€‚â… ç±»ç”µç¼†å¼•å…¥è£…ç½®åº”è®¾æœ‰å¤¹ç´§è£…ç½®ã€‚å¼•å…¥è£…ç½®çš„å¯¼ç®¡éƒ¨åˆ†å¯ä»¥ç”¨èžºçº¹æˆ–å…‰å”与电气设备连接。多余的引入装置å”应用å°å µä»¶å°å µï¼Œå¹¶ç¬¦åˆç›¸åº”防爆型å¼çš„规定。
ä¸ŽåŽŸæ ‡å‡†ç›¸æ¯”å–消了密å°åœˆé‚µå°”æ°ç¡¬åº¦åŠå°ºå¯¸çš„规定，而åªä»¥ç›¸åº”的试验æ¥è€ƒæ ¸ã€‚å¢žåŠ äº†å¼•å…¥è£…ç½®çš„è€å†²å‡»è¯•éªŒã€é˜²æŠ¤è¯•éªŒï¼Œä»¥åŠå¼•å…¥è£…ç½®çš„æ ‡å¿—ã€å¯†å°åœˆçš„æ ‡å¿—ç‰çš„规定。
在é¢å®šå·¥ä½œçŠ¶æ€ä¸‹ï¼Œå¦‚电缆或导管引入装置部ä½çš„温度高于７ï¼â„ƒï¼Œæˆ–电缆分支部ä½é«˜äºŽï¼˜ï¼â„ƒï¼Œåˆ™ç”µæ°”è®¾å¤‡å¤–éƒ¨åº”è®¾ä¸€æ ‡ç¤ºç‰Œï¼Œä»¥ä¾¿ç”¨æˆ·é€‰ç”¨åˆé€‚的电缆，或在导管ä¸é€‚当布线。
密å°åœˆå¼ç”µç¼†å¼•å…¥è£…ç½®å‡åº”è¿›è¡Œå¤¹ç´§è¯•éªŒï¼Œä¸ŽåŽŸæ ‡å‡†ç›¸æ¯”å–消了Ⅱ类æºå¸¦å¼æˆ–移动å¼å’Œâ… 类电气设备引入装置æ‰è¿›è¡Œå¤¹ç´§è¯•éªŒçš„规定。
１８.旋转电机的补充规定 æœ¬æ ‡å‡†ä¸ŽåŽŸæ ‡å‡†ç›¸æ¯”ï¼Œå¢žåŠ äº†â… ç±»æ—‹è½¬ç”µæœºé€šé£Žå”的结构和布置，使大于１２．５ï½ï½çš„异物ä¸å› åž‚ç›´å è½æˆ–振动而触åŠç”µæœºçš„旋转部件，å¯é‡‡ç”¨IＰ１ï¼çš„防护ç‰çº§ã€‚å¢žåŠ äº†å¡‘æ–™é£Žæ‰‡çš„å¡‘æ–™æ质的çƒç¨³å®šæ€§è¦æ±‚，å³å¡‘料的使用温度应高于风扇é¢å®šè¿è¡Œæ¸©åº¦è‡³å°‘ï¼’ï¼ï¼«ã€‚风扇用å«è½»é‡‘属ææ–™åˆ¶é€ æ—¶ï¼Œåº”ç¬¦åˆï¼˜ï¼Žï¼‘或８．３的规定。
１９.开关的补充规定
触头å¼å¼€å…³ä¸å…许浸在å¯ç‡ƒæ€§ç»ç¼˜æ²¹ä¸ã€‚å–æ¶ˆäº†åŽŸæ ‡å‡†çš„ç‰¹æ®Šè§„å®šã€‚å¢žåŠ äº†å¼€å…³æŸœè®¾éš”ç¦»å™¨æ—¶ï¼Œéš”ç¦»å™¨çš„æŽ¥è§¦å’Œæ–å¼€ä½ç½®å¿…须表示明确。开关的外壳内带é¥æŽ§ç”µè·¯æ—¶ï¼Œå¤–壳的门或盖应符åˆä¸‹åˆ—è¦æ±‚：
（1） 门或盖与隔离器è”接。内部éžä¿æŠ¤ç”µè·¯èƒ½æ–开的除外。
（2） 如在隔离器æ–开情况下一些内部元件ä»å¸¦ç”µæ—¶ï¼Œåˆ™å¸¦ç”µå…ƒä»¶åº”采用１．２规定的防爆型å¼ä¿æŠ¤ï¼Œæˆ–电气间隙爬电è·ç¦»ç¬¦åˆå¢žå®‰åž‹â€œï½…â€çš„规定，并且内部用一补充壳体把带电件ä¿æŠ¤åœ¨å†…，壳体的防护ç‰çº§ä¸ºï¼©ï¼°ï¼’ï¼ï¼Œä¸”工具ä¸èƒ½ç›´æŽ¥æŽ¥è§¦å¸¦ç”µä»¶ï¼Œå†…部壳体设“严ç¦å¸¦ç”µå¼€ç›–â€çš„è¦å‘Šç‰Œã€‚
（3） 如ä¸è®¾è”é”则应设“严ç¦å¸¦ç”µå¼€ç›–â€çš„è¦å‘Šç‰Œã€‚
ï¼’ï¼.熔æ–å™¨çš„è¡¥å……è§„å®šï¼ˆåŽŸæ ‡å‡†æ— æ¤æ¡è§„定）
有熔æ–器的外壳应设è”é”装置，è”é”装置应在更æ¢æˆ–安装熔æ–器时切æ–电æºï¼Œå¹¶ä¸”在外壳关åˆå¯é åŽæ‰èƒ½ä½¿ç†”æ–器带电，或者增设“严ç¦å¸¦ç”µå¼€ç›–â€çš„è¦å‘Šç‰Œã€‚
２１.æ’æŽ¥è£…ç½®çš„è¡¥å……è§„å®šï¼ˆåŽŸæ ‡å‡†æ— æ¤æ¡è§„定）
æ’接装置应用机械ã€ç”µæ°”或其他方法è”é”，è”é”应使æ’接装置在带电æ¡ä»¶ä¸èƒ½æ–开，æ–开时æ’头ä¸å¾—带电。或用特殊紧固件将æ’头与æ’座连在一起，并设“严ç¦å¸¦ç”µæ–å¼€â€çš„è¦å‘Šç‰Œã€‚如æ’æŽ¥è£…ç½®ä¸Žç”µæ± è”接，æ–å¼€å‰ä¸èƒ½æ–电，则è¦å‘Šç‰Œæ ‡å¿—为“åªå…许在éžå±é™©åœºæ‰€æ–å¼€â€ã€‚
é¢å®šç”µæµåœ¨ï¼‘ï¼ï¼¡ä»¥å†…，é¢å®šç”µåŽ‹äº¤æµï¼’５ï¼ï¼¶ç›´æµï¼–ï¼ï¼¶ä»¥å†…时的æ’接装置，符åˆä»¥ä¸‹è¦æ±‚时，å¯ä¸è®¾è”é”或特殊紧固件。
（1） æ’座在电æºä¾§ï¼›î€„
（2） æ’头与æ’座分离å‰æœ‰ç弧延迟时间；
（3） 在ç弧期间æ’头座å‡åº”符åˆéš”爆型“ｄâ€çš„è¦æ±‚；
（4） 分开åŽå¸¦ç”µä»¶ä»åº”符åˆï¼‘．２所规定的任一防爆型å¼ã€‚
æ— è®ºåœ¨ä»»ä½•æƒ…å†µä¸‹éƒ½ä¸¥ç¦æœªæ’å…¥æ’座的æ’头元件带电。
ï¼’ï¼’.ç¯å…·çš„补充规定
ä¸ŽåŽŸæ ‡å‡†ç›¸æ¯”å–æ¶ˆäº†â… ç±»è®¾è¦å‘Šç‰Œç¯å…·çš„ç¯åº§ï¼ˆç¬¦åˆï¼§ï¼¢ï¼‘４４４的规定）è¦æ±‚ã€å光罩ã€ç¯åº§è¿žæŽ¥ä»¶æ ‡å¿—“Ｏâ€ç‰çš„è¦æ±‚。ä¿æŠ¤ç½‘网å”é¢ç§¯å¤§äºŽï¼ˆï¼•ï¼Ã—５ï¼ï¼‰ï½ï½î€‹2æ—¶ï¼Œè§†ä¸ºæ— ä¿æŠ¤ï¼Œå–消了表４的规定。
æœ¬æ ‡å‡†è§„å®šç¯å…·åº”有é€æ˜Žä¿æŠ¤ç½©ï¼Œé€æ˜Žä¿æŠ¤ç½©å¯ç”±ä¿æŠ¤ç½‘æ¥ä¿æŠ¤ï¼Œä¿æŠ¤ç½‘的网å”应å°äºŽï¼•ï¼Ã—５ï¼ï½ï½ï¼Œ å¦‚è¶…è¿‡åˆ™è§†ä¸ºæ— ä¿æŠ¤ç½‘。é€æ˜Žç½©å’Œä¿æŠ¤ç½‘å‡åº”ç»å—å†²å‡»è¯•éªŒçš„è€ƒæ ¸ã€‚î€„
ç¯å…·ç”¨åŠçŽ¯å®‰è£…时，åŠçŽ¯åº”铸在或焊接在外壳上。若åŠçŽ¯ç”¨èžºçº¹æ—‹åœ¨å¤–壳上，则须å¦æœ‰é˜²æ¾æŽªæ–½ã€‚ç¯å…·ä¸å…许åªæœ‰ä¸€ä¸ªèžºé’‰å®‰è£…。
ç¯å…·å¯æ‰“开的盖å，应有自动è”é”装置，使ç¯ç›–打开时ç¯åº§çš„所有电æžå‡åˆ‡æ–电æºï¼ˆæœ¬è´¨å®‰å…¨åž‹ç¯å…·é™¤å¤–）。如果æ–路器æ–å¼€åŽé™¤ç¯åº§å¤–æŸäº›éƒ¨ä»¶ä»å¸¦ç”µæ—¶ï¼Œåˆ™è¿™äº›å¸¦ç”µéƒ¨ä»¶åº”用１．２规定的防爆型å¼ä¹‹ä¸€è¿›è¡Œä¿æŠ¤ï¼Œæˆ–电气间隙爬电è·ç¦»ç¬¦åˆå¢žå®‰åž‹â€œï½…â€çš„è§„å®šï¼Œä¸”é™„åŠ å¤–å£³æŠŠå¸¦ç”µéƒ¨ä»¶ä¿æŠ¤åœ¨å†…ï¼Œé™„åŠ å¤–å£³åº”ç¬¦åˆï¼§ï¼¢ï¼”ï¼’ï¼ï¼˜çš„ＩＰ３ï¼çš„规定，且工具ä¸èƒ½ç»è¿‡å¼€å£ç›´æŽ¥æŽ¥è§¦å¸¦ç”µä»¶ï¼Œé™„åŠ å¤–å£³ä¸Šè¿˜åº”è®¾â€œä¸¥ç¦å¸¦ç”µæ‰“å¼€â€çš„è¦å‘Šç‰Œã€‚也å¯è®¾ç½®â€œä¸¥ç¦å¸¦ç”µæ‰“å¼€â€è¦å‘Šç‰Œï¼Œä»£æ›¿è”é”装置。
ä¸å…è®¸ç”¨æ¸¸ç¦»é‡‘å±žé’ ç¯ï¼ˆç¬¦åˆï¼©ï¼¥ï¼£ï¼‘ï¼™ï¼’çš„ä½ŽåŽ‹é’ ç¯ï¼‰ï¼Œå¯ä»¥ä½¿ç”¨é«˜åŽ‹é’ ç¯ï¼ˆä¾‹å¦‚符åˆï¼©ï¼¥ï¼£ï¼–ï¼–ï¼’çš„é’ ç¯ï¼‰î€„
手æç¯å’Œå¸½ç¯çš„补充规定：
â… ç±»å¸½ç¯åº”符åˆï¼§ï¼¢ï¼—９５７矿用安全帽ç¯çš„规定。
Ⅱ类帽ç¯å’Œæ‰‹æç¯åœ¨ç¯å…·å¤„于ç§ç§ä½ç½®çŠ¶æ€å‡åº”防æ¢ç”µè§£æ¶²æµå‡ºã€‚å…‰æºå’Œç”µæºåˆ†åˆ«åœ¨ä¸åŒå¤–壳ä¸ç”¨ç”µç¼†è¿žæŽ¥æ—¶ï¼Œç”µç¼†å¼•å…¥è£…置和电缆按附录Ｄä¸ï¼¤ï¼“．１进行试验。
２３.æœ¬æ ‡å‡†å–æ¶ˆäº†åŽŸæ ‡å‡†ä¸ç©ºé—´åŠ çƒå™¨çš„规定。
ï¼’ï¼”.æœ¬æ ‡å‡†å¢žåŠ äº†åž‹å¼æ£€æŸ¥å’Œè¯•éªŒçš„内容
ç›®çš„åœ¨äºŽç¡®è®¤ç”µæ°”è®¾å¤‡æ ·æœºç¬¦åˆæœ¬æ ‡å‡†å’Œæœ‰å…³é˜²çˆ†åž‹å¼ä¸“ç”¨æ ‡å‡†çš„è§„å®šã€‚î€„
åˆ¶é€ åŽ‚åº”æ供技术资料ã€å›¾çº¸è¯´æ˜Žèƒ½ç¡®åˆ‡å®Œæ•´åœ°ä¿è¯ç”µæ°”设备的防爆安全性，检验å•ä½åº”审查技术资料ã€å›¾çº¸æ˜¯å¦ç¬¦åˆæœ¬æ ‡å‡†å’Œé˜²çˆ†åž‹å¼ä¸“ç”¨æ ‡å‡†çš„è§„å®šã€‚æ£€éªŒå•ä½è¿˜åº”æ£€æŸ¥åˆ¶é€ åŽ‚æä¾›çš„æ ·æœºæˆ–æ ·å“是与技术资料ã€å›¾çº¸ç›¸ç¬¦ï¼Œå¹¶è¿›è¡Œæœ‰å…³è¯•éªŒã€‚
检验å•ä½å¯å–消ä¸å¿…è¦çš„试验，但应记下å–消的ç†ç”±ã€‚对Ｅｘ元件试验过的项目ä¸å†é‡å¤è¯•éªŒã€‚æŸäº›è¯•éªŒå¯åœ¨æ£€éªŒå•ä½çš„试验室进行。也å¯åœ¨æ£€éªŒå•ä½ç›‘ç£ä¸‹çš„其他地方进行。如æ£åŽ‹åž‹â€œï½â€å¯åœ¨åˆ¶é€ 厂或用户进行zuiå°æ¢æ°”é‡ã€æ£åŽ‹å€¼ã€å¤–壳强度ç‰è¯•éªŒã€‚试验结果如ä¸ç¬¦åˆæ ‡å‡†è§„定时，检验å•ä½å¯æŒ‰å®žé™…情况è¦æ±‚对电气设备进行修改。å„项试验å‡åº”在检验å•ä½è®¤ä¸ºzuiä¸åˆ©çš„情况下进行。
２５.冲击试验
æœ¬æ ‡å‡†å–æ¶ˆäº†åŽŸæ ‡å‡†å¯¹é€æ˜Žä»¶é‡‡ç”¨èšé…°èƒºï¼ˆå°¼é¾™ï¼‰é”¤å¤´è¿›è¡Œå†²å‡»è¯•éªŒçš„规定。
冲击锤应安装一个直径为２５ï½ï½çš„åŠçƒå½¢æ·¬ç«é’¢åˆ¶å†²å‡»å¤´ï¼Œå†²å‡»é”¤è´¨é‡ä¸ºï¼‘ｋｇ自高度ｈ垂直下è½å†²å‡»ç”µæ°”设备表é¢ã€‚冲击能é‡è§è¡¨ï¼”。表４ä¸â… ç±»æ— ä¿æŠ¤é€æ˜Žä»¶å†²å‡»çš„能é‡ç”±åŽŸæ ‡å‡†ï¼‘ï¼ï¼ªæ”¹ä¸ºï¼—Ｊ。
通常试验在装é…完好的电气设备上进行。对é€æ˜Žä»¶è¯•éªŒæœ‰å›°éš¾æ—¶ï¼Œå¯å°†é€æ˜Žä»¶è£…åœ¨è®¾å¤‡æœ¬èº«æˆ–ç±»ä¼¼çš„æ”¯æž¶ä¸Šè¿›è¡Œè¯•éªŒã€‚åˆ¶é€ åŽ‚ä¸Žæ£€éªŒå•ä½å商åŒæ„åŽï¼Œä¹Ÿå¯åœ¨ç©ºå¤–壳上进行。
玻璃é€æ˜Žä»¶åœ¨ä¸‰ä¸ªæ ·å“上进行试验，æ¯ä¸ªæ ·å“è¯•ä¸€æ¬¡ï¼Œå…¶ä»–é›¶ä»¶åº”åœ¨äºŒä¸ªæ ·å“上进行试验，æ¯ä»¶æ ·å“在两个ä¸åŒä½ç½®å„进行一次试验。
通常试验环境温度为（２ï¼Â±ï¼•ï¼‰â„ƒï¼ˆåŽŸæ ‡å‡†ä¸ºï¼ˆï¼’ï¼Â±ï¼‘ï¼â„ƒï¼‰ã€‚æ料在低温下抗冲击性能é™ä½Žæ—¶ï¼Œè¯•éªŒåœ¨è§„定的zuiä½Žæ¸©åº¦ä¸‹è¿›è¡Œï¼ˆåŽŸæ ‡å‡†æœªè¯´æ˜Žæ¤è¦æ±‚）。
塑料部件应在比zui高工作温度高１ï¼Kzui多高１５K的温度下和比zui低工作温度低５Kzui多低１ï¼Kçš„æ¸©åº¦ä¸‹åˆ†åˆ«è¿›è¡Œè¯•éªŒï¼ˆåŽŸæ ‡å‡†é«˜æ¸©è‡³å°‘ï¼•ï¼â„ƒï¼Œä½Žæ¸©ï¼ï¼’５℃±３℃，户内ï¼ï¼•â„ƒÂ±ï¼’℃）。
试验时电气设备放在zuiå°‘ï¼’ï¼ï½‹ï½‡çš„钢质基座上。
ï¼’ï¼–.è·Œè½è¯•éªŒî€„
æºå¸¦å¼ç”µæ°”设备除进行冲击试验外还应进行跌è½è¯•éªŒã€‚试验环境温度åŒå†²å‡»è¯•éªŒï¼Œå¡‘料部件åªåœ¨ä¸‹é™æ¸©åº¦ä¸‹è¿›è¡Œã€‚åŽŸæ ‡å‡†æœªè§„å®šå¡‘æ–™éƒ¨ä»¶åœ¨ä½Žæ¸©ä¸‹è¿›è¡Œè¯•éªŒã€‚å†²å‡»å’Œè·Œè½è¯•éªŒåŽä¸åº”引起电气设备防爆型å¼çš„任何æŸå。
ï¼’ï¼—.外壳防护ç‰çº§è¯•éªŒî€„
按ＧＢ４２ï¼ï¼˜ã€ï¼§ï¼¢ï¼”ï¼™ï¼”ï¼’ï¼Žï¼‘çš„è§„å®šè¿›è¡Œã€‚ä¸ŽåŽŸæ ‡å‡†ä¸€è‡´ï¼Œä½†æœ¬æ ‡å‡†çš„è¦æ±‚更详细。
２８.ç»ç¼˜å¥—管æ‰è½¬è¯•éªŒî€„
ä¸ŽåŽŸæ ‡å‡†åŸºæœ¬ä¸€è‡´ï¼Œæœ¬æ ‡å‡†å¯¹å…¶å™è¿°æ›´æ˜Žç¡®å…·ä½“ã€‚å¯¹å…¶ä»–è§„æ ¼çš„èžºæ “å¯ç»˜åˆ¶æ›²çº¿ç¡®å®šï¼Œå¯¹å¤§è§„æ ¼çš„èžºæ “å¯ç”±æ›²çº¿å¤–推法得出。
２９.温度试验
ä¸ŽåŽŸæ ‡å‡†ç›¸åŒï¼Œä½†å¯¹ç”µæ°”设备有多ç§ä½¿ç”¨ä½ç½®ï¼Œåªæµ‹æŸä¸€ç‰¹å®šä½ç½®çš„温度时，应在试验报告上说明，并且设备防爆åˆæ ¼è¯å·åŽåŠ “Ｘâ€ï¼Œæˆ–用å°æ ‡ç‰Œæ ‡æ˜Žã€‚
３ï¼.çƒå‰§å˜è¯•éªŒî€„
æœ¬æ ‡å‡†è§„å®šå¯¹ç¯å…·é€æ˜Žä»¶å’Œç”µæ°”设备观察窗玻璃å‡åº”ç»å—çƒå‰§å˜è¯•éªŒã€‚åŽŸæ ‡å‡†åªå¯¹ç¯å…·é€æ˜Žä»¶è¿›è¡Œè¯•éªŒï¼Œä¸”试５个é€æ˜Žä»¶ï¼Œæ¯ä¸ªé€æ˜Žä»¶ä»…作一次，以å‡ä¸æŸå为åˆæ ¼ã€‚æœ¬æ ‡å‡†å–消了æ¤è§„定。
３１.éžé‡‘属外壳和外壳的éžé‡‘属部件的试验
åŽŸæ ‡å‡†åªå¯¹å¡‘料外壳进行çƒç¨³å®šæ€§è¯•éªŒï¼Œè€Œæœ¬æ ‡å‡†é™¤å¯¹å¡‘料外壳进行è€çƒã€è€å¯’试验（å³çƒç¨³å®šæ€§è¯•éªŒï¼‰å¤–，还须进行机械试验，光è€åŒ–试验ã€è€åŒ–å¦è¯•å‰‚试验ã€è¡¨é¢ç”µé˜»è¯•éªŒå’Œæœ‰å…³é˜²çˆ†è¯•éªŒã€è€ç‡ƒçƒ§æ€§èƒ½è¯•éªŒç‰ã€‚
â… ç±»ç”µæ°”è®¾å¤‡é¡»è¯•ï¼–åªæ ·å“，Ⅱ类电气设备试２åªæ ·å“ã€‚æ ¹æ®è®¾å¤‡æƒ…况也å¯ä»¥å‡å°‘æ ·å“。
表é¢ç”µé˜»çš„测é‡ç”µæžç”±åŽŸæ ‡å‡†î€ŠÎ¦î€Šï¼ˆï¼•ï¼Â±ï¼ï¼Žï¼‘）ï½ï½åœ†çŽ¯æ”¹ä¸ºç›¸è·ï¼ˆï¼‘ï¼Â±ï¼ï¼Žï¼•ï¼‰ï½ï½é•¿ï¼ˆï¼‘ï¼ï¼Â±ï¼‘）ï½ï½å®½ï¼ˆï¼‘±ï¼ï¼Žï¼’）ï½ï½çš„两æ¡å¹³è¡Œç›´çº¿æ®µã€‚
３２.爆炸性混åˆç‰©ä¸çš„è¯•éªŒä¸ŽåŽŸæ ‡å‡†ç›¸åŒî€„
åŽŸæ ‡å‡†çš„â€œç”µç¼†å’Œå¯¼çº¿å¼•å…¥è£…ç½®å¤¹ç´§è¯•éªŒâ€ã€â€œæ¹¿çƒè¯•éªŒâ€ã€â€œæ©¡èƒ¶ææ–™è€åŒ–试验â€ç‰æœ¬æ ‡å‡†ä»Žæ£æ–‡ä¸å–消，这些è¦æ±‚移入了相应的附录ä¸ã€‚
３３.例行检查和试验
æœ¬æ ‡å‡†è§„å®šäº†ä¾‹è¡Œæ£€æŸ¥å’Œè¯•éªŒåŠåˆ¶é€ 厂责任。
åˆ¶é€ åŽ‚å¿…é¡»è¿›è¡Œæ£€æŸ¥å’Œè¯•éªŒä»¥ä¿è¯ç”Ÿäº§çš„电气设备符åˆæŠ€æœ¯èµ„æ–™å’Œæ ‡å‡†çš„è§„å®šã€‚î€„
åˆ¶é€ åŽ‚è´£ä»»î€„
åˆ¶é€ åŽ‚åº”å¯¹å…¶ç”Ÿäº§çš„äº§å“符åˆæŠ€æœ¯èµ„æ–™åŠæ ‡å‡†çš„规定负责
ç”µæ°”è®¾å¤‡æ”¹é€ å’Œä¿®ç†åŽæ£€æŸ¥è¯•éªŒî€„
在电气设备上进行修改，涉åŠåˆ°è®¾å¤‡çš„防爆类型和温度时，应由检验å•ä½é‡æ–°è¿›è¡Œæ£€éªŒã€‚åŽŸæ ‡å‡†æœªæ˜Žç¡®è§„å®šè¿™äº›è´£ä»»ã€‚î€„
３４.æ ‡å¿—î€„
ç”µæ°”è®¾å¤‡ä¸»ä½“æ˜Žæ˜¾å¤„åº”è®¾ç½®æ ‡å¿—ã€‚æ ‡å¿—å¿…é¡»è€ƒè™‘åˆ°å¯èƒ½å˜åœ¨çš„化å¦è…蚀下，ä»æ¸…æ™°å’Œè€ä¹…。对如有“清晰ã€è€ä¹…â€ï¼Œåœ¨æ³¨ï¼‘ã€ï¼’ä¸ä¸¾ä¾‹è¿›è¡Œäº†è¯´æ˜Žï¼šå¦‚凸凹纹，用é’é“œã€é»„é’¢ã€ä¸é”ˆé’¢ç‰ï¼Œä¹Ÿå¯ç”¨å…¶ä»–方法，以设备通过å„项试验åŽä»æ¸…æ™°ã€ä¸è„±è½ä¸ºåˆæ ¼ã€‚æ ‡å¿—æ料的厚度未åšé™åˆ¶ï¼Œæ ‡å¿—åº”æ ‡å‡ºï¼¥ï½˜ã€é˜²çˆ†åž‹å¼ã€ç±»åˆ«ã€æ¸©åº¦ç»„别。
æœ¬æ ‡å‡†å¯¹é˜²çˆ†åˆæ ¼è¯çš„ç¼–å·æ–¹æ³•ä¹Ÿè¿›è¡Œäº†è§„定。
３５.附录Ａ 检验程åºï¼ˆæ ‡å‡†çš„附录） 
ï¼©ï¼¥ï¼£æ ‡å‡†æ— æ¤è§„定，其é€æ£€è¦æ±‚å¦æœ‰æ¡ä¾‹ã€‚æ ¹æ®æˆ‘å›½æƒ…å†µï¼ŒåŽŸæ ‡å‡†çš„é€æ£€ç¨‹åºå„åˆ¶é€ åŽ‚å·²ç†Ÿæ‚‰ï¼ŒçŽ°å‚照国外惯例è¦æ±‚进行必è¦çš„修改，使其既适åˆæˆ‘国国情åˆç¬¦åˆå›½å¤–一般惯例。
修改的内容如下：
（1） é€æ£€çš„技术文件ä¸ï¼Œäº§å“图纸åªè¦æ±‚é€ä¸Žé˜²çˆ†æ€§èƒ½æœ‰å…³çš„å›¾çº¸ã€‚ä¸Žé˜²çˆ†æ€§èƒ½æ— å…³çš„å›¾çº¸å¯ä¸é€æ£€ï¼Œä»¥ä¾¿æ›´å¥½åœ°ä¿æŠ¤åˆ¶é€ 厂的技术秘密。
（2） åŽŸæ ‡å‡†â€œå¿…è¦çš„计算资料和说明â€ä¿®æ”¹ä¸ºâ€œä¸ºç¡®ä¿ç”µæ°”设备安全性必è¦çš„其他资料â€ã€‚
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