View Full Version : Lighting
dispatch43130
Nov 2, 2012, 06:56 PM
How to run 120 volt incandescent from 277 volt circuit?
*Threads Merged*
stanfortyman
Nov 2, 2012, 07:59 PM
You can't.
shuntripper
Nov 3, 2012, 05:12 AM
You can't.
OP may have asked the wrong question?
What is the panel voltage? Is it 120/277 or 277/480? Can you pull new wire? Or is the entire circuit one that can be changed to 120V operation?
dispatch43130
Nov 3, 2012, 11:54 AM
Let me rephrase my question. The house panel is 277/480 and the lighting circuit is 277 v. I want to add some 120 chandeliers. I'm hearing that you can purchase 120/277 magnetic transformers for this situation but they only go to 300 VA, is this possible?
shuntripper
Nov 3, 2012, 02:05 PM
Here's a 5KVA , 277V primary/120V secondary general purpose transformer
http://www.acmepowerdist.com/datasheets/Section%201/1-phase/T-2-79744-S.pdf
Selected from this page (group VII)
Acme Electric (http://www.acmepowerdist.com/energy-efficient-transformers-single-phase.htm)
Have an electrician install it for you.
dispatch43130
Nov 3, 2012, 02:35 PM
I'm asking about a lighting transformer. The type that you install on a 4 square j box. I can only find 300 volt amp for $60
shuntripper
Nov 3, 2012, 02:53 PM
I'm asking about a lighting transformer. The type that you install on a 4 square j box. I can only find 300 volt amp for $60
You said "chandeliers" without specifying the load and asked for more. Chandeliers can be huge...
http://www.lightinguniverse.com/chandeliers/american-brass-ch-9614-9600-series-40-light-fortylight-chateau-chandelier_g296430.html?isku=2792114&linkloc=cataLogProductItemsImage
stanfortyman
Nov 3, 2012, 03:26 PM
The house panel is 277/480 and the lighting circuit is 277 v.This is obviously a commercial setting so your only option is to call an electrician.
Any place that has a 277/480V service must also have an on site transformer with 120/240v or 120/208v panels. This is to get you standard 120v receptacles.
dispatch43130
Nov 3, 2012, 03:39 PM
This is obviously a commercial setting so your only option is to call an electrician.
Any place that has a 277/480V service must also have an on site transformer with 120/240v or 120/208v panels. This is to get you standard 120v receptacles. There is 120/208 panels also but they are maxed out. Can I get lighting transformers for less than $60 or higher than 300 VA?
stanfortyman
Nov 3, 2012, 03:44 PM
Can I get lighting transformers for less than $60 or higher than 300 VA? HaHaHa... Not likely.
Call an electrician and see what your options are.
shuntripper
Nov 3, 2012, 06:25 PM
There is 120/208 panels also but they are maxed out. Can I get lighting transformers for less than $60 or higher than 300 VA?
What brand panels and type of breakers? I'm guessing bolt on breakers, tell me the letter designation
For example Siemens BL or Square D BOQ or CutlerHammer BL, It will be a paper tag on each breaker you have to remove the deadfront to read the teeny tiny print.
tkrussell
Nov 4, 2012, 05:15 AM
Adding small transformers for lighting, unless it is only one fixture, is a bandaid approach. How many 120 volt fixtures are you planning to add?