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Thread: Wire size

  1. #27
    timebuilder's Avatar
    timebuilder is offline AOP Committee/Professional Member*
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    Quote Originally Posted by acts238 View Post
    We called an electrician out for this customer. They ran #6 wire all the way to the unit. New 50 amp breaker, new disconnect, real fine job.
    This is a REAL suggestion.

    Ask your electrician friend why he didn't wire the outdoor unit according to article 430 of the NEC.

    Please post his answer back here.
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    2 Tim 3:16-17

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  2. #28
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    Jan 2010
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    Van Buren Arkansas
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    wire size

    Quote Originally Posted by timebuilder View Post
    This is a REAL suggestion.

    Ask your electrician friend why he didn't wire the outdoor unit according to article 430 of the NEC.

    Please post his answer back here.
    which part of article 430 NEC, are we looking at.

  3. #29
    Join Date
    Jun 2003
    Location
    Chicago, IL
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    4,321
    If the unit ran fine for 10 years on the 30 amp breaker, I suspect something else is up.

    2 weeks ago i got a no A/C call.

    Found this
    12 year old 4 ton trane
    40 amp breaker
    8 awg wire throughout
    25 amp fuses in the disconnect (looked original)

    MCA 40 amps
    MOP 50 amps

    cleaned the extremely dirty condenser, installed 30 amp time delay fuses (biggest that would fit in that disconnect), and tested compressor ohms and amp draw.

    everything was good.

    Two days later the compressor shorted to ground.

    I suspect the compressor was on its way out and thats what blew the fuses the first time.

  4. #30
    Join Date
    Sep 2011
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    7
    Quote Originally Posted by acts238 View Post
    When I discovered the 30 amp tripped breaker, and checked the nameplate on the 50 amp min. unit. I quickly realized, someone made a mistake.
    a 50amp is a #6 thhn,all day long

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