Kristian Laine asks about whether equipotential bonding is required for an electrical supply to a pumpset mounted on steelwork. His question 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 electrical installation.
The pump is connected to a 2000 litre tank and metal pipework. The whole installation is sat on metal girders and then - in turn - sat on a concrete base. The electrical supply is from a local distribution board. The MET is a very long way away in this case.
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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