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110V 16A sockets in a ring arrangement

Tom D

I am planning to make a 110v circuit containing up to 10 x 16A 110V single sockets. The circuit is up to 100m long. Is 32A MCB type C and H07 4mm2 will be ok for it or I need to take into consideration of using RCBO instead and calculate voltage drop to size required cable properly?

  • 0 in reply to Tom D

    the transformer is 5kVA and protection device they use for this circuit is 32A MCB type C

    Is that MCB on the primary or secondary? (i.e, 230V side or 110V side?) - it seems a bit small for 5kVA at 110V and if on the primary might suggest they're expecting >>32A to be available to the 110V sockets in total (so maybe not a 32A ring then...)

       - Andy.

  • 0 in reply to AJJewsbury

    if its on the primary side, and a real (24 hour rated) 5000 watt unit, the first thing it will probably do if the transformer is half decent is to trip on the inrush when the mains is switched on as the inrush will probably be of order ~ 300 amps

    ref.

    If so will either need surgegard type current limiting arresters in series or maybe a D type breaker.

    Mike.

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