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Sizing of RCBO

FusionControlEng

Hello All

I have been given the tasks of the sizing of an RCBO for 20 x 13A sockets, I am very new to electrical services design 

Obviously, the size of the RCBO will not be 260A  as this would assume all the sockets will be pulling 13A all at the same time which is very unlikely to happen

Is there a basic methodology for sizing an RCBO?

Many thanks

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  • 0

    The most common approach is to utilise a standard circuit. Very often a 32 amp circuit for a floor area of up to one hundred square meters, or sometimes a 20 amp circuit for a smaller area. Other arrangements are possible though.

    Cable sizes should be determined by a suitably experienced person and depend on a number of factors.

    Double check that the proposed RCBO is a true RCBO that provides both overload protection AND earth fault protection, an RCD that provides ONLY earth fault protection is NOT suitable unless used with a suitable fuse or MCB that provides overload protection.

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  • 0

    The most common approach is to utilise a standard circuit. Very often a 32 amp circuit for a floor area of up to one hundred square meters, or sometimes a 20 amp circuit for a smaller area. Other arrangements are possible though.

    Cable sizes should be determined by a suitably experienced person and depend on a number of factors.

    Double check that the proposed RCBO is a true RCBO that provides both overload protection AND earth fault protection, an RCD that provides ONLY earth fault protection is NOT suitable unless used with a suitable fuse or MCB that provides overload protection.

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