What is the explosion proof ?

To understand what is meant by explosion proof, it must look at the context of the expression and organization that defined it. The National Fire Protection Association (NFPA) began publishing the National Electrical Code (NEC®) in 1897. The NEC® is also known as NFPA 70 and ANSI / NFPA 70 of its inclusion in the body of NFPA codes.

The NEC® contains definitions of several types of acceptable protection techniques in the design of products for use in hazardous locations (classified): Explosion proof, dust ignition proof, dust-proof, purged / Intrinsically Safe Pressure , and sealed. These set the criteria that must be met by all components installed in hazardous locations (classified).

To meet the criteria for protection against explosions, a speaker must be able to contain any explosion from inside the enclosure and prevent sparks from inside his ignition box vapors, gases, dust or fibers in the air surrounding it. Therefore, evidence of the explosion, referring to electrical boxes, does not mean it is able to withstand an external explosion. Instead, it is the ability of the speaker to prevent internal spark or explosion causing a much larger explosion.

In addition, the NEC declares that the equipment must meet the temperature requirements of the specific application in which it is installed. This means that the engine operating temperature (and speaker) or another component can not be higher than the lowest temperature of ignition / combustion gases or dust into the atmosphere, where the component must be installed.

All components are marked on their plate with the separate classification in which they have been tested and approved for installation.



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