Cooker switch 45a and MCB 32a

Discussion in 'Electricians' Talk' started by Victor Lek, Oct 13, 2021.

  1. Victor Lek

    Victor Lek Member

    From CU there is a 6mm cable running into the kitchen. Cooker cannot be directly connected, it needs an isolator switch. I’ve checked and most of cooker switches are 45a and the MCB controlling the 6mm cable is 32a which seems to be also the standard config…. 32a MCB and 45a cooker switch.
    Could you please explain me why this is correct. It does not make sense to me.. if overload happens the it would be the MCB tripping first. Shouldn’t it be the other way around and the cooker switch fuse before the MCB trips?
    Please note I’m not a spark and probably this is very basic but would like to understand the functional process.
    Thanks a lot
  2. jonathanc

    jonathanc Screwfix Select

    The cooker switch has no fuse. It is rates for 45a so the weakest part of the circuit is the MCB as it should be
    terrymac likes this.
  3. Victor Lek

    Victor Lek Member

    Oh. Ok I thought it was fused. Make sense now

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