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Question about MCB rating?

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  • 29-10-2020 7:50am
    #1
    Ninja1000
    Registered Users Posts: 9 ✭


    Morning guys and girls :)

    What is the biggest MCB that you are permitted to use with a 10sq cable?


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    #2
    Lenar3556
    Registered Users Posts: 1,463 ✭✭✭Lenar3556


    Ninja1000 wrote: »
    Morning guys and girls :)

    What is the biggest MCB that you are permitted to use with a 10sq cable?

    It depends on a number of factors but 40A would typically be comfortable.


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    #3
    Risteard81
    Registered Users Posts: 2,567 ✭✭✭Risteard81


    Lenar3556 wrote: »
    It depends on a number of factors but 40A would typically be comfortable.
    Indeed. And quite often 50A would be fine.

    As above it depends on how it is installed, ambient temperature, grouping and other derating factors etc. and also the maximum temperature for the switchgear and terminals it is connected to (generally 70 degrees C).


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