ju
Member
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- New Jersey
Can I put a 45 KVA transformer in a plemum rated ceiling?
Transformer Article 450
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russ
Senior Member
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- Burbank IL
Re: Transformer Article 450
I'm reading 300.22(C)(1) Wiring Methods. The wiring methods for such other space shall be limited to totally enclosed, nonventilated, insulated busway having no provisions for plug in connections,..............
(2)Equipment Electrical equipment with a metal enclosure listed for the use.........
The quote from (1) may not fit a transformer, but most of them are vented.
Maybe a non vented would be ok, but I don't think a vented one would be.
Russ
[ June 21, 2003, 07:49 AM: Message edited by: russ ]
I'm reading 300.22(C)(1) Wiring Methods. The wiring methods for such other space shall be limited to totally enclosed, nonventilated, insulated busway having no provisions for plug in connections,..............
(2)Equipment Electrical equipment with a metal enclosure listed for the use.........
The quote from (1) may not fit a transformer, but most of them are vented.
Maybe a non vented would be ok, but I don't think a vented one would be.
Russ
[ June 21, 2003, 07:49 AM: Message edited by: russ ]
Re: Transformer Article 450
This practice of mounting transformers is plenum rated ceiling is done all the time and accepted by the AHJ, I would refer to the following code section:
450.13.B
Hollow Space Installations. Dry-type transformers 600 volts, nominal, or less and not exceeding 50 kVA shall be permitted in hollow spaces of buildings not permanently closed in by structure, provided they meet the ventilation requirements of 450.9 and separation from combustible materials requirements of 450.21(A). Transformers so installed shall not be required to be readily accessible.
This practice of mounting transformers is plenum rated ceiling is done all the time and accepted by the AHJ, I would refer to the following code section:
450.13.B
Hollow Space Installations. Dry-type transformers 600 volts, nominal, or less and not exceeding 50 kVA shall be permitted in hollow spaces of buildings not permanently closed in by structure, provided they meet the ventilation requirements of 450.9 and separation from combustible materials requirements of 450.21(A). Transformers so installed shall not be required to be readily accessible.
russ
Senior Member
- Location
- Burbank IL
Re: Transformer Article 450
bwyllie:
Your right right! I just looked in my 1999 handbook and found it.
"Section 450-13(b)continues to permit the installation of dry-type transformers rated 600 volts or less and not exceeding 50 kva in hollow spaces of hung ceiling areas, provided these spaces are fire resistant, ventilated, and accessible". It also goes on to say that it,s ok even if it,s used in a space used for enviromental air provided the transformer is in a metal enclosure.
Russ
[ June 21, 2003, 05:54 PM: Message edited by: russ ]
bwyllie:
Your right right! I just looked in my 1999 handbook and found it.
"Section 450-13(b)continues to permit the installation of dry-type transformers rated 600 volts or less and not exceeding 50 kva in hollow spaces of hung ceiling areas, provided these spaces are fire resistant, ventilated, and accessible". It also goes on to say that it,s ok even if it,s used in a space used for enviromental air provided the transformer is in a metal enclosure.
Russ
[ June 21, 2003, 05:54 PM: Message edited by: russ ]
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