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Thread: Electrical cable size

  1. #1
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    Electrical cable size

    Greetings to everyone.

    I need some advice from experienced electricians please.

    A 15m electrical cable (underground) needs to be connected from an existing DB to a mini sub DB (63A earth leakage,20A breakers x2 and 10A light circuit)

    On mini sub DB there are 2 plug points, 1 x 2ft double fluorescent light.... 9000btu aircon will be installed on later stage using one of the 20A breakers.

    This place is just a storeroom nothing will be connected on the plugs.

    My question is what cable size and 'outt building' breaker would be sufficient for this installation?

  2. #2
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    a 30 amp circuit breaker with a 4mm cable should be plenty.







    Quote Originally Posted by Tsg View Post
    Greetings to everyone.

    I need some advice from experienced electricians please.

    A 15m electrical cable (underground) needs to be connected from an existing DB to a mini sub DB (63A earth leakage,20A breakers x2 and 10A light circuit)

    On mini sub DB there are 2 plug points, 1 x 2ft double fluorescent light.... 9000btu aircon will be installed on later stage using one of the 20A breakers.

    This place is just a storeroom nothing will be connected on the plugs.

    My question is what cable size and 'outt building' breaker would be sufficient for this installation?

  3. #3
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    Thanks Bergie,was thinking about 16mm and 40A.

    Thanks again ����

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