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277 to 120 transformer #130772
12/30/06 10:52 AM
12/30/06 10:52 AM
V
village-electric  Offline OP
Junior Member
Joined: Oct 2006
Posts: 4
Sedona, AZ
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

Tools for Electricians:
Re: 277 to 120 transformer #130773
12/30/06 12:59 PM
12/30/06 12:59 PM
I
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
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
Re: 277 to 120 transformer #130774
12/30/06 01:04 PM
12/30/06 01:04 PM
I
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
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
Re: 277 to 120 transformer #130775
01/21/07 04:22 PM
01/21/07 04:22 PM
T
Tesla  Offline
Member
Joined: Jun 2004
Posts: 1,273
Sacramento, CA
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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