Kristian Laine asks this question, which concerns the possible need for an electric pump set installation to be bonded to a distant MET. It has been answered by the NICEIC (Theme – Regulations & Legislation):
Question: We are installing a 16A 230V electrical supply to a small motor/pump set that is part of external installation. The pump is connected to a 2000 litre tank and metal pipework. The whole installation sits upon metal girders and then - in turn - rests on a concrete base. The supply is from a local distribution board. Note that the MET is a very long way away.
Does this installation need main equipotential bonding back to the MET?
Answer: If the tank and pipework meet the conditions as an extraneous conductive part, i.e. introduce earth potential and simultaneously accessible with conductive parts, then it must be bonded to the MET.
I would suggest that bonding is required in this case.
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