1. Explosion-proof luminaire housings shall be provided with a conspicuous permanent embossed or embossed logo "Ex". A nameplate must be placed on the outside of the casing. The warning signs shall be clearly visible and placed in the appropriate position. If the "open the cover after the power is turned off" warning sign must be placed near the opening cover. Explosion-proof lighting knowledge summary Aluminum Casting Led Lighting Parts Aluminum Casting Led Lighting Parts,Led Bulb Aluminum Housing,Led Aluminum Extrusion,Led Aluminum Profile NINGBO AIKEHAN METAL PRODUCT CO.,LTD , http://www.diecastingsupplier.com
1. Explosion-proof luminaire housings shall be provided with a conspicuous permanent embossed or embossed logo "Ex". A nameplate must be placed on the outside of the casing. The warning signs shall be clearly visible and placed in the appropriate position. If the "open the cover after the power is turned off" warning sign must be placed near the opening cover. 2. Because explosion hazardous areas are often accompanied by corrosive gases, the signs on the explosion-proof luminaire housing must be bronze, brass, stainless steel "target=_blank> stainless steel or resistant to a thickness of not less than 1mm (small luminaire thickness not less than 0.5mm). It is made of other materials with corrosiveness not lower than the above materials. It should be reliably fixed, not easy to be worn out or peeled off. 3. The method of checking the durability of the mark is: rubbing with a cloth soaked in water for 15s to be dried, then dipping After rubbing the cloth for 15s, the mark should be clear and not falling off. 4. The contents of the nameplate should include: A. Explosion-proof mark. B Basic mark: including product name, model name, manufacturer name, registered trademark, factory Date, etc. C performance safety signs: including rated voltage, current, nominal frequency, source power and quantity, allowable ambient temperature (this range is only -20 ~ +40 ° C when not marked), specific applicable environmental signs (such as Products that only use one type of explosive gas mixture shall be marked with the name or molecular formula of the flammable gas, and the classification mark (such as "number") of the luminaire. D explosion-proof certificate number, which proves that the product has been officially tested by the explosion-proof inspection station. Some products have an "x" symbol after the explosion-proof certificate number, which indicates that the product can only be used under certain special safe use conditions. The specified conditions should be clearly marked in the lamp housing or product manual. For example, some old-fashioned explosion-proof explosion-proof luminaires use high-intensity gas discharge light sources. The explosion-proof safety performance is only equivalent to the current non-sparking explosion-proof luminaires. It should be marked as “only applicable to Zone 2â€. For products that only apply to an explosive gas mixture, the name or formula of the flammable gas must be indicated. Explosion-proof luminaires that are only applicable to a certain ignition temperature shall be marked with the highest surface temperature. Explosion-proof luminaires that can only withstand low impact energy impact on the casing shall be marked as “only applicable to places where the risk of mechanical spoilage is lowâ€. There are many types of special safe use conditions. If the user has the “x†symbol after seeing the explosion-proof certificate number, you should pay attention to find out what special safety conditions are used for the product, so that it can be operated correctly during installation and use. To avoid danger. D additional instructions. In addition to the above markings, the detailed instructions necessary to ensure proper installation, use and maintenance shall be given on the luminaire, on the ballast built in, or in the manufacturer's product manual supplied with the luminaire. For example: The allowable working position of A explosion-proof luminaires, some explosion-proof luminaires can only be installed in a certain position or an angle range, because the change of the working tension, the heat distribution and the highest surface temperature of the explosion-proof luminaire surface will change. The main reason for the limitation of the working position of the explosion-proof lamps is that the maximum surface temperature is controlled so as not to exceed the temperature group marked by the explosion-proof lamps themselves, resulting in dangerous temperatures. In addition, changes in the working position will also affect the life and performance of some light sources, and will affect the insulation materials, electrical components, insulation properties, and life of the lamps. Therefore, explosion-proof luminaires that have restrictions on the location of installation must be clearly stated. B To reduce the maximum surface temperature of the explosion-proof lamps and reduce the product temperature grouping level, the explosion-proof lamps designed with special specification light sources must indicate the name, model, shape and size of the light source and the manufacturer. If not indicated, when the user switches to other bulbs of the same power, the maximum surface temperature of the explosion-proof luminaire may exceed the ignition temperature of the explosive gas mixture in the environment, posing an explosion hazard. C Under the most unfavorable conditions of normal operation, the insulation material of the power cable or wire is subjected to the highest temperature in the luminaire. If it exceeds 80t, it should be marked to match the corresponding cable and wire. When there are special requirements for the introduction of cables or wires, the specifications, models and applicable temperatures must be specified. D lamps with batteries shall state the type, nominal voltage and nominal capacity of the battery to avoid loss and danger. E For explosion-proof luminaires with concentrating and similar properties, the shortest distance from the object to be illuminated should be indicated to prevent the object being burned and burned. The rated maximum operating temperature tω(C) of the F ballast coil, the rated maximum operating temperature of the capacitor tc(C), wiring diagram 5 
Analysis of the line of explosion-proof electrical equipment 1. Location selection Electrical circuits should be laid at locations where the risk of explosion is small or remote from the source of release. 2, the choice of laying method Explosion hazardous environment in the electrical circuit mainly has explosion-proof steel pipe wiring and cable wiring. 3. Isolation seals The channels for laying electrical circuits and the protective pipes, cables or steel pipes should be tightly clogged with non-combustible materials when passing through partitions or floors between areas with different levels of explosion hazard. 4. Selection of wire materials Within the scope of explosion hazardous environment hazard level 1, the distribution line should be copper conductor or cable. In the case of severe vibration, a multi-strand copper core cable or a multi-strand copper core cable should be used. Aluminum core power cables shall not be used in coal mines. In the range of explosion hazard environment hazard level 2, the power line shall adopt aluminum core wire or cable with a cross-sectional area of ​​4mm2 and above, and the lighting circuit may adopt a cross-sectional area of ​​2.5 mm2. And above aluminum wire or cable. 5. Allowable current carrying capacity The selection of the insulated conductor section and the cable section of Zone 1 and Zone 2 shall not be less than 1.25 times of the rated current of the fuse and the setting current of the long-delay overcurrent tripper of the breaker. The allowable current carrying current to the branch of the low-voltage cage induction motor shall not be less than 1.25 times the rated current of the motor. 6. Connection of electrical lines The intermediate joints of the electrical lines of Zones 1 and 2 must be inside the explosion-proof junction box or splice box that is compatible with the hazardous environment. The explosion-proof junction box should be used in Zone 1, and the increased safety junction box can be used in Zone 2. If the aluminum line cable or wire is used in the electrical circuit of Zone 2, it must be reliable for the correct installation and maintenance of the user. Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn