Do all fixed water appliances: boilers, cyinders with pumps on them and the likes of, require a separate earth wire from the appliance back to the meter earth terminal bar? Or will a wire from an earth tag to the switch be enough? What if the appliance has mainly plastic piping connected to it?
TIA
no
yes, unless in a bathroom or other location where equipotential bonding is required
it still has to be earthed in accordance with the manufacturers' instructions.
Flow of electric current only needs 1 path - doesn't matter how many "plastic paths" there are!
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