As described above, the explosion proof motor enclosure is constructed will all the right clearance, thickness and components so as to withstand the explosion pressure with the prescribed factor of safety. This makes the overall construction very robust.
There is no one single standard universally followed for explosion proof certification. In fact, the list is more than shown above - CSA, ANZex, AUSEx, UL and FM are the other explosion proof standards, each having its own set of compliance requirements, though subscribing to a similar broad category of rules. To which standard to comply?
As motors operate at high voltage, explosion proof is the only protection mechanism, not intrinsic safety. Intrinsic safety allows the use of conventional instrumentation cables to wire from the safe area to the hazardous area.
This document does not pertain to low voltage oil-filled or direct current (DC) power capacitors. 4.1 Capacitor internal design and construction Description of internal materials, dielectric, insulation, metallization, winding methodology and filling agent.
Explosion proofing is very much a mechanical engineering design. Common techniques for implementing explosion proofing are explained below. This method is based on the concept of explosion containment. The ignition source is permitted to come in contact with the hazardous air/gas mixture.
Explosion proof/intrinsic safety are two technologies which guarantee that under no circumstances will equipment emit energy to cause an explosion. The objective of this document is to describe how to do the mechanical and electronic design for electrical/electronic equipment deployed in a hazardous environment.