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    dispatch43130's Avatar
    dispatch43130 Posts: 4, Reputation: 1
    New Member
    		  
    #1

    Nov 2, 2012, 06:56 PM
    Lighting
    How to run 120 volt incandescent from 277 volt circuit?






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    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
    Electrical & Lighting Expert
    		  
    #2

    Nov 2, 2012, 07:59 PM
    You can't.
    shuntripper's Avatar
    shuntripper Posts: 180, Reputation: 8
    Junior Member
    		  
    #3

    Nov 3, 2012, 05:12 AM
    Quote Originally Posted by stanfortyman View Post
    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's Avatar
    dispatch43130 Posts: 4, Reputation: 1
    New Member
    		  
    #4

    Nov 3, 2012, 11:54 AM
    Lighting
    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's Avatar
    shuntripper Posts: 180, Reputation: 8
    Junior Member
    		  
    #5

    Nov 3, 2012, 02:05 PM
    Here's a 5KVA , 277V primary/120V secondary general purpose transformer

    http://www.acmepowerdist.com/datashe...-2-79744-S.pdf

    Selected from this page (group VII)

    Acme Electric

    Have an electrician install it for you.
    dispatch43130's Avatar
    dispatch43130 Posts: 4, Reputation: 1
    New Member
    		  
    #6

    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's Avatar
    shuntripper Posts: 180, Reputation: 8
    Junior Member
    		  
    #7

    Nov 3, 2012, 02:53 PM
    Quote Originally Posted by dispatch43130 View Post
    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/chan...ductItemsImage
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
    Electrical & Lighting Expert
    		  
    #8

    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's Avatar
    dispatch43130 Posts: 4, Reputation: 1
    New Member
    		  
    #9

    Nov 3, 2012, 03:39 PM
    Quote Originally Posted by stanfortyman View Post
    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's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
    Electrical & Lighting Expert
    		  
    #10

    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's Avatar
    shuntripper Posts: 180, Reputation: 8
    Junior Member
    		  
    #11

    Nov 3, 2012, 06:25 PM
    Quote Originally Posted by dispatch43130 View Post
    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's Avatar
    tkrussell Posts: 9,659, Reputation: 725
    Uber Member
    		  
    #12

    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?
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