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circuit-breaker allegedly "getting more sensitive"

Former Community Member
Former Community Member
OK, usual caravan park issues with more pitches than incoming supply, so client has acknowledged this by installing 10 A circuit-breakers for each 16 A outlet. With 24 pitches on a presumed 80 A single-phase cut-out, he has got away with it..... so far, but he doesn't close for winter....


He has a few regulars that complain about the 10 A circuit-breaker being too sensitive so client believes them and has fitted new 10 A circuit-breakers ready for this weekend.


Considering that a 10 A circuit-breaker will run at 11.3 A continuously and 16 A for about 10 minutes, I'm more inclined to think that the "shed puller's" use of the 2 kW built in heater, 2 kW supplementary fan heater, fridge and domestic 3 kW kettle plus entertainment equipment are more likely....


But, has anyone carried out any tests on circuit-breakers to prove/disprove the alleged reduced rating? Or links to any such reports?


Regards


BOD
Parents
  • 0
    perspicacious:
    ....we recommend a 60% diversity factor is applied  to  the  MCB  nominal  rated  current  where  it is

    intended  to load the MCB' s continuously  (in excess of 1 hour).

    ...

    Hmm, so a EICR carried out on my dwelling with a 16 A circuit-breaker on my 3 kW immersion heater in a 210 litre cylinder would result in what code? ...


    Well reading the rest of the advice, it only applies to close packed breakers,  so no code if the breakers on either side were lightly loaded, or its suggests you should fit a 20A one  if they are.

    Perhaps they think we should fit 40A breakers to 32A rings to avoid stressing the breakers. I'd disagree.

    I suggest  that like the total demand diversity calculations themselves, where we see breakers totally 200-300A on a 100A company fuse with no issues , this is so much cobblers.

    regards

    Mike.


Reply
  • 0
    perspicacious:
    ....we recommend a 60% diversity factor is applied  to  the  MCB  nominal  rated  current  where  it is

    intended  to load the MCB' s continuously  (in excess of 1 hour).

    ...

    Hmm, so a EICR carried out on my dwelling with a 16 A circuit-breaker on my 3 kW immersion heater in a 210 litre cylinder would result in what code? ...


    Well reading the rest of the advice, it only applies to close packed breakers,  so no code if the breakers on either side were lightly loaded, or its suggests you should fit a 20A one  if they are.

    Perhaps they think we should fit 40A breakers to 32A rings to avoid stressing the breakers. I'd disagree.

    I suggest  that like the total demand diversity calculations themselves, where we see breakers totally 200-300A on a 100A company fuse with no issues , this is so much cobblers.

    regards

    Mike.


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