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3x 2.5mm in MCB

vantech

Hi,

Any issues with 3x 2.5mm cables in an MCB?

MCB feeds 3 socket radials. I don’t see any issue with loading etc, however is there any regulation / guide that prohibits this many single conductors in a single MCB?

I am sure spurs from MCBs on ring finals are allowed, so I am thinking this is fine as long as they are secured correctly.

Thanks. 

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  • 0

    Hello Vantech.

    3 x 2.5mm in one MCB terminal is fine, all things being equal re good workmanship etc. It's covered in Electrical Safety First "Guidance for Installers when Making Connections in Consumer Units," page 9.

    Regards,

                   Colin Jenkins.

  • 0 in reply to Colin Jenkins

    More important than E.S.F. is BS7671.  Appendix 15A, while only informative, states regarding ring circuits: 

    "An unfused spur may be connected to the origin of the circuit in the distribution box".

    Can that be done without having three conductors in an MCB?

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  • 0 in reply to Colin Jenkins

    More important than E.S.F. is BS7671.  Appendix 15A, while only informative, states regarding ring circuits: 

    "An unfused spur may be connected to the origin of the circuit in the distribution box".

    Can that be done without having three conductors in an MCB?

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