mcb

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  1. T

    Lock Off Device for Triple Pole Main switch & MCB

    Hi all. I am undertaking an assessment next week called SAFE ISOLATION OF SUPPLIES. It involves isolating and securely locking off a circuit to be worked on. The 4 items to be isolated is THE WHOLE INSTALLATION, A 3 PHASE CIRCUIT, SINGLE PHASE CIRCUIT & LOCAL ISOLATION (which is an isolator...
  2. T

    Type of MCB .........................

    In domestic when the Zs easily low enough why do we default to have type B instead of C curve MCB's/RCBO's
  3. R

    Sub panel: Underrated MCB?

    Hello all A quick question about an existing layout if I may. The layout consists of a main CU connected to a sub panel via a single 63 amp MCB. A Dorman Smith K1PC63 to be exact. Total potential load on the sub panel is 25Kw. Routinely all of that load is present on the sub panel...
  4. C

    Max zs on double pole mcb

    I am filling out test sheets and have a merlin gerin D32 C60 HD double.pole mcb. The rating on the mcb says 415V feeding 2 feeds to a canalis busbar. BS7671 States max zs for D32 0.4 secs is 0.34. Is this just for single pole MCB? I have also check my max zs value from manufacture stating...
  5. C

    Appliance tripped MCB after....

    Carried out an eicr and noticed x2 double sockets have reverse polarity that supply a frying machine at high level. (this was a return visit to correct the faults) After correcting the reverse polarity on the two sockets i plugged the fryer back in and the circuit MCB tripped out and the...
  6. R

    mcb and cable size help

    Hello all I've just developed a wiring fault on the only ring main, after spending a few days attempting to find it and being pretty appalled by my findings. I have decided to re-wire the house. I have just spent all my spare money on a cruise so I guess I will have to get "Me sen ltd" to do...

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