What is Explosion Proof?
Engineers are constantly working to improve existing standards to make machines not only more efficient, but also safer to operate, both in regular and emergency situations.Get more news about
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To help engineers and technicians around the world achieve this goal, The National Fire Protection Association (NFPA) started publishing the National Electric Code (NEC) in 1897.
The code, also known as NFPA 70 and ANSI/NFPA 70, defines various standards related to protection techniques that must be used when designing products intended for use in hazardous locations.
In order to be deployed in such environments, products typically need to also satisfy safety protocols established by the ATEX Directive and IECEx, an international system for certification of equipment for use in explosive atmospheres created by the International Electrotechnical Commission (IEC).
Components designed following these rules must be dust ignition proof, dust-tight, purged and pressurized, intrinsically safe, hermetically sealed and explosion-proof.
Explosion-Proof Standards
To satisfy the explosion-proof standards set out by the NEC and IEC, an enclosure must be able to contain possible explosions originating within its housing, as well as preventing sparks from the inside to ignite vapors, gases, dust, or fibers in the air surrounding it.
Explosion-proof then refers not to the ability of the enclosure to withstand an external explosion, but to contain an internal one, thus preventing internal damages to affect surrounding machinery and people.
The NEC also states that explosion-proof equipment must meet the temperature requirements of the specific application in which it is to be installed.
In other words, the operating temperature of a given device must not be greater than the lowest ignition temperature of the dust or gases in the atmosphere where the component is to be installed.
Products listed as explosion-proof according to NEC are divided into use for use in Class I, Division 1 or 2 locations. Generally speaking, the equipment listed for a higher classification surpasses the requirements for lower classifications.
According to the NEC, products identified for a Division 1 location are permitted in a Division 2 location belonging to the same class, group, and temperature class.
