What's This For?

well if the tanks are steel cuboids stood on sleepers or concrete blocks, as they are in more rural Hants, then the tank is neither solidly earthed nor electrically floating. It might be the intention that ensures something trips if a boiler or pump fault tries to make it live.

It may not be that useful in many cases with PME earthing, but round here the sort of rural places that burn oil are normally TT supplied on bare overhead singles installed in the 1950s, so  all additional electrodes capable of sinking multiples of 30mA will be gratefully received ;-) For the oilmen it was probably easier to fit one every time than to ask.

Mike

well if the tanks are steel cuboids stood on sleepers or concrete blocks, as they are in more rural Hants, then the tank is neither solidly earthed nor electrically floating. It might be the intention that ensures something trips if a boiler or pump fault tries to make it live.

It may not be that useful in many cases with PME earthing, but round here the sort of rural places that burn oil are normally TT supplied on bare overhead singles installed in the 1950s, so  all additional electrodes capable of sinking multiples of 30mA will be gratefully received ;-) For the oilmen it was probably easier to fit one every time than to ask.

Mike

The supply is P.M.E. and the boiler and pump will be effectively earthed Mike.

Z.

then it not that much use, but it is probably easier to always fit one, and PME+ rod is certainly not wrong.

M.