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Is it acceptable to install switches and sockets at the same height as the originals (1930's house) in a 3 room new build extension ? Or do they have to conform to the 450mm & 1200mm height as in a complete new build ?

Perhaps someone can help. Probably being thick, but anyway..... 4mm SWA from MK split load CU, connected via 32A MCB on non RCD side. SWA teminates in a mini MK CU fitted with a 63A main CB with RCD protection, in the log cabin. 32A MCB for ring. 6A MCB for lights. Obviously, from the CU...

When calculating voltage drop for a ring circuit, do you divide the length of cable required in half?

Does anyone have a diagram (or know where one can be found) showing how to perform a test to determine the location of a fault within the damaged cable of a ring-main? For example: When carrying out an insulation resistance test between 'live' conductors of the socket outlet circuit, a short...