I have an explosion proof enclosure with a relief valve located on top. Why would this enclosure have a relief valve?
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Relief Valve on EXP Enclosure
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It looks like a valve, I believe it is called a "drain and breather", the one I am referring to is on top so it is a breather. These do not compromise the ability to contain an explosion?Time is of the essence, and I am low on essence. ~ Graham Hill
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This is a typical manufacturer's application diagram.
They do practically guarantee that flammable gases/vapors will enter an explosionproof enclosure. Then again, the flammable gases/vapors will enter through any threaded connection anyway, with or without a drain/breather, which is why I usually avoid them.
That said, a drain/breather identified for Class I does not usually "compromise" the enclosure. The exception is salt-air applications where residue build up may (only may) defeat the spring. Personally, I've never had that happen."Bob"
Robert B. Alexander, P.E.
Answers based on 2017 NEC unless otherwise noted.
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