Summary: Electrical earthing: Learn how to earth and bond earth wires to copper pipes.
Because metal objects and plumbing pipes in a bathroom will be in close proximity to water as well as electricity, you must ensure that they are earthed. If you can touch an electrical appliance or switch at the same time as touching ANYTHING with metal on it, then the object or pipe must be connected to the main earthing cable. Objects like radiators, tap tails and airing cupboard pipes are easily forgotten - so be thorough.
You can either connect to the earth terminal in a socket, or to a pipe that has already been earthed and has an unbroken connection to the earth terminal in the consumer unit. If you connect to earthed pipes, make sure they are accessible to be inspected by making a hatch in the floor or panelling.
An earth terminal block in the consumer unit.
Main bonding conductors must be connected to terminals on the earthing block and to gas, oil and water pipesn at the other.
Airing cupboard pipes should be linked to ensure an unbroken metal earth route.
Use 4mm2 earth cable to bridge metal pipe to metal pipe around a plastic water tank.
Link non-electrical metal fittings with 4mm2 earth cable.
Author: C J Mills Google+
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