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Thread: Edison Circuit

  1. #1
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    Nov 2004
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    Edison Circuit

    What's the difference betwen an Edison Circuit and Mutlwire Branch circuit?

  2. #2
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    Re: Edison Circuit

    Name, I believe they are the same (that is a guess on my part).
    Charlie Eldridge, Indianapolis, Utility Power Guy
    Responses based on the 2011 NEC, unless stated otherwise.

  3. #3
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    Re: Edison Circuit

    The system was originally designed by Edison himself for his Direct Current systems. In those days, conductor costs were the primary factor for electrical installations and this "new" system provided a means for supplying two circuits using only three wires. This made for significant savings.

    This concept was borrowed by Tesla and Westinghouse during the developement of the alternating current system. It later became known as the multiwire branch circuit.

    On a side note, I believe the 3Ø wye multiwire systems were once called the "round robin circuit".
    Bryan P. Holland, MCP

  4. #4
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    Re: Edison Circuit

    how can you use a mutlwire branch circuit on DC?

  5. #5
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    Nov 2004
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    Re: Edison Circuit

    I was just asking because I did trim with a guy yesterday, and I was looking at the panel and there was some 3-conductor, and I asked him what it was going to, and he said it was a "edison circuit"...which when he explained it, seemed just like a Multiwire BC.

  6. #6
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    Re: Edison Circuit

    how can you use a mutlwire branch circuit on DC?
    I think it might be more productive to ask what the differences would be.

    Edit: I can't seem to stop misspelling

    [ December 21, 2004, 02:04 PM: Message edited by: physis ]
    Sam, San Francisco Bay Area

  7. #7
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    Re: Edison Circuit

    Originally posted by domnic:
    how can you use a mutlwire branch circuit on DC?
    The system is identical to a 3-wire AC system except that the loads are connected between two positive leads of a DC generator which both share a common negative lead.

    I believe Edison used 2-100V generators for his typical system.
    Bryan P. Holland, MCP

  8. #8
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    Re: Edison Circuit

    I never did see a DC circuit set up like the Edison AC system but I assumed the common would be a negative and a positive tied together? If you tied the positives or negatives together and used them as a common you wouldn't have the benefit of being able to balance it and have the same size common.

    Ronald

    [ December 21, 2004, 04:43 PM: Message edited by: ronaldrc ]

  9. #9
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    Apr 2003
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    Re: Edison Circuit

    I tried to find a link to something regarding DC Edison circuits but all I could find was a bunch of spooky stories of the dreaded AC version of the Edison circuit.

    From what's being said on the internet I think we should all start businesses that remove the dangerous and deadly multiwire circuits from innocent peoples homes.
    Sam, San Francisco Bay Area

  10. #10
    Join Date
    Nov 2004
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    284

    Re: Edison Circuit

    Yeah, the only few things I found were about how bad Multiwire Branch Circuits were when I did research.

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