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New tool
by SMOKEYBOB - 02/15/21 04:59 PM
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 277 to 120 transformer
#130772
12/30/06 10:52 AM
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Joined: Oct 2006
Posts: 4
OP
Junior Member
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Hi,
I have a customer in a medical center office wanting to light up some art work.
We spoke of a 4' track and 4-5 heads.
Anyone have a source for transformer for this application?
Thanks Steve
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Re: 277 to 120 transformer
#130773
12/30/06 12:59 PM
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Joined: Jan 2003
Posts: 4,391
Moderator
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Assuming one 20 amp circuit I would use a 3.O KVA 277 to 120 transformer.
This should be a shelf item at a major supply house.
Square D, GE, Jefferson and many others make them.
Than you need to go to 250.30 for grounding this transformer and Article 450 for overcurrent protection of it.
Bob Badger
Construction & Maintenance Electrician
Massachusetts
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Re: 277 to 120 transformer
#130774
12/30/06 01:04 PM
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Joined: Jan 2003
Posts: 4,391
Moderator
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By the way, I assume it must be really difficult to run a new 120 volt circuit to this location?
In my opinion doing a 'legal' transformer install for this will cost quite a bit.
I would tap a receptacle circuit to run this one track.
Bob Badger
Construction & Maintenance Electrician
Massachusetts
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Re: 277 to 120 transformer
#130775
01/21/07 04:22 PM
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Joined: Jun 2004
Posts: 1,273
Member
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Consider Low Voltage spot lamps.
Order 277 to 12VAC transformers -- as against the typical 120 to 12VAC transformers.
These are listed equipment that you'd place at each 4' section.
The last ones I touched were on pendant rails.
Not cheap to buy or install. But very classy. And that's the whole point of the display, anyway.
Tesla
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