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Your most pressing National Electrical Code (NEC) questions answered
I have a 30amp explosion proof disconnect (enclosure) for my class1 division 2 HVAC equipment. The HVAC equipment has a sealed off explosion proof enclosure that contains all the spark causing components. There is less than 18" between the (2) enclosures. I have always chosen to error on the side of safety and use a seal off at both enclosures. But I have been told by our Electrical manager (I'm an HVAC manager) that it is allowable to use the single seal off at the HVAC and run 16" of seal tite to the top of the 30amp disconnect. I have nothing but 25 years of industrial HVAC experience and what I think is an accurate understanding of NFPA 496. Would someone please help me put this to rest once in for all? I need a clear conscience so I can ship this building.
Thanks in advace for anyones help,
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