ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
dsk 13
Admin 8
doc 3
Recent Posts
Bathroom electrical
by doc. 08/19/17 06:53 AM
electircal ageing test on IPC
by SIAME. 08/15/17 02:43 AM
electrical aging test on IPC
by gfretwell. 08/15/17 12:27 AM
"Line level" audio on Cat 5?
by gfretwell. 08/08/17 10:39 PM
Fire alarm phone lines and color coding
by gfretwell. 08/08/17 10:26 PM
New in the Gallery:
Gallery Test
Popular Topics(Views)
239,983 Are you busy
175,581 Re: Forum
167,831 Need opinion
Who's Online Now
0 registered members (), 61 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#130772 - 12/30/06 11:52 AM 277 to 120 transformer  
village-electric  Offline
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:

#130773 - 12/30/06 01:59 PM Re: 277 to 120 transformer  
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

#130774 - 12/30/06 02:04 PM Re: 277 to 120 transformer  
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

#130775 - 01/21/07 05:22 PM Re: 277 to 120 transformer  
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


Member Spotlight
mersadrad
mersadrad
Montreal, Quebec, Canada
Posts: 28
Joined: March 2011
Show All Member Profiles 
Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.010s Queries: 14 (0.002s) Memory: 0.7599 MB (Peak: 0.8915 MB) Zlib enabled. Server Time: 2017-08-20 15:41:38 UTC