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Join Date: Feb 2012
Posts: 11

MCB Rating for 13A Plug Point for Home

01/08/2013 9:01 AM

what is the suitable mcb rating for 13A plug point. I planned to make one 16A mcb for twin 13A socket. But it consume more cables. Or can i use 20A mcb for two twin 13A socket? since not all 4 point in a circuit use at one time!

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#1

Re: MCB Rating for 13A Plug Point for Home

01/08/2013 9:16 AM

It doesn''t depend on the number of sockets. MCB selection is a function of cable size, as that is what the MCB is designed to protect.

Follow British Standard 7671, latest edition. Generally, either a 16A or a 20A MCB feeding a radial 2.5mm2 twin-and-earth cable is an acceptable solution for feeding any number of sockets on the radial. Going to 32A MCB would require either a ring-main of 2.5mm2 feeding any number of sockets or a radial in 4mm2 cable feeding any number of sockets. If in doubt, consult a qualified local electrician, particularly if the proposed installation falls under Part P of the Building Regulations as regards notification, testing and certification when complete, otherwise insurmountable obstacles may be encountered later while attempting to change the freehold of the building. There is also the risk of loss adjustment by the building's insurers should the cause of the fire be traced back to an uncertificated electrical installation.

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