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The National Fire Protection Association (NFPA) began publishing the National Electric Code (NEC®) mu 1897.

In order to meet explosion-proof grade standards, the enclosure must be able to accommodate any explosions occurring within its enclosure and prevent sparks in its enclosure from igniting vapors, gases, dust or fibers in the surrounding air. Therefore, explosion protection does not mean that it can only withstand external explosions when it comes to electrical enclosures. This is the ability of the chassis to prevent internal sparks or explosions from causing a larger explosion.

The surface temperature or any parts of the electrical equipment that may be exposed to the hazardous atmosphere should be tested that it does not exceed 80% of the auto-ignition temperature of the specific gas or vapor in the area where the equipment is intended to be used.

Explosion-proof equipment

Definition: Electrical equipment that does not ignite the surrounding explosive atmosphere under specified conditions.

Divided into three categories:

Class I: underground electrical equipment in coal mines;

Class II: All other electrical equipment for explosive gas environment except coal mines and underground mines.

Class III: Electriacal equipment used in explosive dust environments other than coal mines

The product JWBT810 is IIC, Suitable for IIA, IIB explosive atmosphere. And JWBT810 is T6. The applicable environment is: hazardous dust and gas atmospheres, petrochemical industry,Tunnel, metro, railway, LRT, speedway, marine, ship,offshore, mine, power plant, bridge etc.