Bonding of pipework to the earthing system is important because of the rasie in earth potential during a fault but because of the low currents involved this bonding doesn't need to be very big (6mm ^ 2 in the UK).
Bonding of pipework to the earthing system is important, not because of the rise in earth potential during a fault but because of the low currents involved. This bonding does not need to be very big (6mm 2 in the UK).