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    rctf1's Avatar
    rctf1 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Oct 23, 2010, 10:09 AM
    What size wire do I need for a 60 amp breaker running 50' to power a plasma cutter?
    I am running a cable wire with no conduit 50 feet from the panel box. I have heard some say 6 gauge is OK where I want to buy the cable they are telling me 4 gauge.
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Oct 23, 2010, 06:18 PM
    Need #4 copper if a cable, such as Romex ,or SE.
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
    Electrical & Lighting Expert
    		  
    #3

    Oct 23, 2010, 07:05 PM

    Just curious, TK is rarely incorrect on things, so I am wondering about the thinking behind #4cu.

    #6cu in NM or SE cable must use the 60 deg C column in 310.16.
    In this column #6 is rated for 55A. Since there is no 55A breaker we can round up to 60A.
    Unless the actual full load is 56-60A I would say #6cu is fine.
    creahands's Avatar
    creahands Posts: 2,854, Reputation: 195
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    #4

    Oct 23, 2010, 09:16 PM

    If manufacturer is recommending a 60 amp breaker, I would assume unit takes more then 50 amps to start and run.

    I am not an electrician, but agree with TK. Use #4 copper.

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

    Oct 24, 2010, 05:12 AM
    Sorry. I hit the agree button instead of the quote button. No big deal.


    Quote Originally Posted by creahands View Post
    If manufacturer is recommending a 60 amp breaker, I would assume unit takes more then 50 amps to start and run.

    I am not an electrician, but agree with TK. Use #4 copper.

    Chuck
    This is fine, but what do you base it on?
    Even if it takes 90A to start, this is figured into the equation. Like I said, if the running amps are under 56 than #6 will be fine. At only 50' the distance is not at a consideration.

    Knowing that TK certainly knows what he is talking about I was just curious as to why he suggests #4.
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