BigDog,
If the enclosure is an explosionproof enclosure, then you can use standard blocks, however I expect that you have sealed contacts and an enclosure that is not explosionproof. Can you post the part numbers, so that we can see what you have?
If the contacts are sealed and you are in Class 1 Div 2 areas, the enclosure does not have to be explosionproof and conduit seals are not required at the enclosure.
Don(resqcapt19)
