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#94104 - 07/06/05 02:57 PM Transformer in plenum ceiling?
boggerbutt2454 Offline

Registered: 02/27/05
Posts: 44
Loc: Concord NC USA
Is this legal or not? I know you can install one above a suspended ceiling but can you if it is a plenum ceiling?

2014 / 2011 NEC & Related Books and Study Guides
#94105 - 07/07/05 01:05 PM Re: Transformer in plenum ceiling?
George Little Offline

Registered: 01/18/04
Posts: 1492
Loc: Michigan USA
I don't see a problem installing a transformer in a space above the ceiling as discribed in 300.22(C). If however, it is indeed a plenum as discribed in (B) you may have a problem. There are other considerations in Article 450 that need to be addressed also such as accessibility and size of transformer.
George Little

#94106 - 07/07/05 02:54 PM Re: Transformer in plenum ceiling?
boggerbutt2454 Offline

Registered: 02/27/05
Posts: 44
Loc: Concord NC USA
It is a 45 KVA transformer and it is vented.
I have never done this before as I was told it would have to be a sealed transformer or in an enclosure. It was explained that the dust and lint that is being sucked into the plenum could build up on the windings of a vented transformer and the heat from the transformer could ignite it. This installation would take place in a clothing store in a mall.


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