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Central Heating protected by B10 10a breaker

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  • 13-03-2017 6:30pm
    #1
    Andy From Sligo
    Registered Users Posts: 11,718 ✭✭✭✭


    Our oil central heating system in our house is protected only by a B10 10a MCB breaker in the CU only .. no spur with a 3a fuse in it anywhere not near the time clock or anywhere in the system ....

    Should i be concerned? - everything on the system like clock/roomstat boiler ect says "protect with a 3amp Fuse"
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    #2
    K.Flyer
    Registered Users Posts: 8,565 ✭✭✭K.Flyer


    Is there no spur beside the time clock?


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    #3
    Andy From Sligo
    Registered Users Posts: 11,718 ✭✭✭✭Andy From Sligo


    K.Flyer wrote: »
    Is there no spur beside the time clock?

    nope


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    #4
    Andy From Sligo
    Registered Users Posts: 11,718 ✭✭✭✭Andy From Sligo


    so are we talking something like over 2400w to trip that 10a breaker? - even at 3amp that will not blow until its over 720w basing if the voltage is 240v - i think i have that right. I timesed the amperage by 240


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    #5
    Andy From Sligo
    Registered Users Posts: 11,718 ✭✭✭✭Andy From Sligo


    easiest thing to do would be to swap out the B10 in the CU for a B3 3amp breaker wouldnt it, but I am not allowed to do that as a consumer am I?

    Even then the breaker would only be single pole 3a - arent you supposed to have 3amp DP switch?


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    #6
    TPM
    Registered Users Posts: 871 ✭✭✭TPM


    the purpose of the circuit breaker in the consumer board is to protect the wiring not what is connected to it.
    The correct solution is to get the proper protection/fuses fitted


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    #7
    Andy From Sligo
    Registered Users Posts: 11,718 ✭✭✭✭Andy From Sligo


    TPM wrote: »
    the purpose of the circuit breaker in the consumer board is to protect the wiring not what is connected to it.
    The correct solution is to get the proper protection/fuses fitted

    .. ok, so should I be concerned that the low power items are connected to a 10a breaker?


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    #8
    Tom44
    Registered Users Posts: 948 ✭✭✭Tom44


    Andy From Sligo wrote: »
    .. ok, so should I be concerned that the low power items are connected to a 10a breaker?

    Only if you're been electrocuted.


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    #9
    Andy From Sligo
    Registered Users Posts: 11,718 ✭✭✭✭Andy From Sligo


    Tom44 wrote: »
    Only if you're been electrocuted.

    You would still be electrocuted the same because its an mcb breaker not an RCD/rccb/rcbo.

    So looking at it logically you more than likely have a 0.5mm or 0.75mm light duty flex running through the heating system (wiring to time switches, roomstats , zone valves etc) and if its protected by a heavier 10a breaker then could that mean if there is a short or malfunction on the heating system could the wiring overheat and possibly catch fire before tripping the 10amp MCB? Its a possibility isn't it?


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