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    linejoc's Avatar
    linejoc Posts: 8, Reputation: 1
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    #1

    Dec 31, 2010, 08:51 AM
    What is the maximum size 3 wire copper can go in 3 inch pvc
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
    Electrical & Lighting Expert
     
    #2

    Dec 31, 2010, 09:16 AM

    26 in Sch80
    30 in Sch40


    I have to say, this is an extremely odd request. Is it for a test or homework or something?
    Anyone really needing to know this would have a copy of the NEC and would know exactly where to look.

    May I ask why you are asking this?
    linejoc's Avatar
    linejoc Posts: 8, Reputation: 1
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    #3

    Dec 31, 2010, 09:38 AM
    Comment on stanfortyman's post
    We have an under sized generator and have to upgrade it to a 100 kw and the feed from the generator now is 4/0-2/0 AL in 3 in conduit 250 feet from the house
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
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    #4

    Dec 31, 2010, 10:03 AM

    OH!! You asked how large of a 3-wire. Not how many #3 conductors. Sorry.

    You would NOT run a "3-wire" cable in conduit. You would run 3 or 4 individual conductors.

    I have to say, anyone who does this for you will know what to do.

    You really need a 100kW(!? ) genset for a house? For real? Sounds like a real mansion, not even a McMansion.
    linejoc's Avatar
    linejoc Posts: 8, Reputation: 1
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    #5

    Dec 31, 2010, 10:12 AM
    Comment on stanfortyman's post
    Believe me it is the 48kw is to small keeps tripping out we are pulling close to 300 A right now
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
    Electrical & Lighting Expert
     
    #6

    Dec 31, 2010, 10:19 AM

    10,000+ sq/ft?

    What could you POSSIBLY be running that you are tripping a 48kW genset??
    Are you familiar with the idea that you do not have to run everything in your house during emergencies?
    linejoc's Avatar
    linejoc Posts: 8, Reputation: 1
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    #7

    Dec 31, 2010, 10:41 AM
    Comment on stanfortyman's post
    I said it is a mansion all the floors are radient heat etc.
    linejoc's Avatar
    linejoc Posts: 8, Reputation: 1
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    #8

    Dec 31, 2010, 10:49 AM
    Comment on stanfortyman's post
    That is 300A on each leg we are looking to upgrade to a 800A service
    linejoc's Avatar
    linejoc Posts: 8, Reputation: 1
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    #9

    Dec 31, 2010, 10:51 AM
    Comment on stanfortyman's post
    That is for the main house the guest house also runs off the genset it is only a 200A service
    linejoc's Avatar
    linejoc Posts: 8, Reputation: 1
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    #10

    Dec 31, 2010, 11:18 AM
    Comment on stanfortyman's post
    I know I need 3 individual conductors what is the largest copper I can put in 3 in PVC I need to know if I have to upgrade the conduit
    aguywithfeet's Avatar
    aguywithfeet Posts: 29, Reputation: 3
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    #11

    Jan 4, 2011, 04:10 PM
    If the PVC is schedule 40 (thinner stuff) and the wire is THHN which is most common. You can put 3 700 MCM(kCM). You may need a ground too though which will be considered in the pipe fill. This was installed by a licensed electrician right? If so one would hope it was done right. It is overlooked by a lot of home owners though. And good for you for having a gigantic house.
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
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    #12

    Jan 4, 2011, 04:14 PM
    Quote Originally Posted by aguywithfeet View Post
    And good for you for having a gigantic house.
    :rolleyes:

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