Sorry to bring up this old chestnut but just seeking clarification as it was in 2005 that it was first raised. I am now retired and my last update was C and G 2008
I have been asked to maintain a small sewage tank system for 6 houses. This consists of air pump and controls and lift pump.The pump controls are situated approx 200 metres from the incoming main and earthing / supply is an armoured cable with cpc which is connected to a TN C S (PME) at origin.
The only metalwork in the tank is a 25mm pipe from lift pump to outlet and internal blower pipework.
Is it allowed to export the PME system in this case or should it have been a TT system with RCD at origin ?
Many thanks FP