Situation.
Double domestic garage. Inside at the rear is a large steel heating oil tank on blocks off a concrete floor at high level. A copper oil pipe runs down and underground across a passageway to the oil boiler in the house. Garage sockets and light TT earthed via a garage unit with a 30mA R.C.D. The garage earth electrode is about 1.5m from the buried copper oil pipe in the passage outside.
The house earthing system is TN-C-S. The copper oil pipe is main bonded at the house.
Are there any potential safety issues here?
Z.
