The building regs has a zone of protection that is 6 inches from and wall, floor or ceiling and in line vertically and horizontally with any fixed outlet and these are the only acceptable places to run buried cables and they must be covered by an RCD.
I don't think the Building Regulations concern themselves with such things BUT if they have reproduced the electrical regulations somewhere and included 6 inches from the floor, then THEY ARE WRONG.
Capping be it metal or plastic isn’t designed to protect cables from drilling, it’s designed as a fixing for cables and at most protect the cables from a plasterers float and it doesn’t need bonding to earth.
I stand mildly corrected, it’s an electrical regulation and it doesn’t include the bottom of a wall where skirting would run but it is 150mm everywhere else I said.
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