I have been convinced that you can install a transformer (dry type) in a class 1 div 2 location but if you are coming out of a 480v panel into and out of the transformer and to a 208 panel; what seals are required and where? Both panels are above the classified location and the tranformer is on the floor between them.
75KVA transformer on floor of class i div 2 garage
- Thread starter lfloyd
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My opinion: barring de-calssification by ventilation, I would think if can keep yoir conduits and wiring above 18" you should have no problem. With a 75kva transformer, I would think that would be possible.
If not, boundary seal-offs would be required.
If not, boundary seal-offs would be required.
- Location
- Mission Viejo, CA
- Occupation
- Professional Electrical Engineer
Augie is catching on. 
I would have noted the seals, if needed, don't need to be explosionproof. My person opinion is that seals aren't needed at all in this application, but that wouldn't be "Code", so I?d install them anyway.
I would have noted the seals, if needed, don't need to be explosionproof. My person opinion is that seals aren't needed at all in this application, but that wouldn't be "Code", so I?d install them anyway.
BPoindexter
Inactive, Email Never Verified
- Location
- MT Vernon, WA
Brings up a question I have in regards to that. Have you or anyone else seen a seal that is not explosionproof and yet:
"Such seals shall not be required to be explosionproof but shall be identified for the purpose of minimizing passage of gases under normal operating conditions and shall be accessible."
Just wondering if there is a type of seal out there I have not seen?
- Location
- Mission Viejo, CA
- Occupation
- Professional Electrical Engineer
The key is recognizing that identified does not necessarily mean listed or labeled. See its definition in Art 100 and its commentary as applied to Classified locations in Section 500.8(A).
Augie is catching on.
Whew! When I saw you had replied to the OP it scared em to death.... I said "self, you have screwed up again on an XP question"
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
Taking into consideration what rbalex mentioned, I don't see why "duct seal" in the end(s) of raceways wouldn't work, as long as the duct seal will withstand whatever conditions it may be subjected to.
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