Blind plugs in Explosion proof equipment

[fvbekkum]

Are there special requirement for blind plugs used to fill unused cable entries of explosion proof equipment, vs. the blind plugs used in threaded rigid metal conduit and IMC.
So, are different or can the same blind plugs be used?
If different plugs are to be used, how can I see a specific blind plug is 'listed'?
What are the specific requirements for either type?

 

[rbalex]

Depending on your NEC version, you should see Section 500.8(E) or 500.8(E) and 110.12(A).

Basically, you will need a listed, threaded plug with five full threads engaged.