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Main to out building

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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

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    If the armour is protected by the PME earth, then you could have the RCD at the load end if you prefer.

    Is it credible that a person can be in good contact with terra-firma earth and the TNCs supply derived one at the same time?


    Even if so , it is an acceptable risk to do so if this is only occurring occasionally, so perhaps consider if  this is any more frequent than say contact with a lamp post, or a light fitting in a metal frame bus stop, on a PME supply - which is acceptable.

    Something like a milking parlour or a building site has regular hand and feet contact time - I suspect this is not the case here.


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  • 0
    If the armour is protected by the PME earth, then you could have the RCD at the load end if you prefer.

    Is it credible that a person can be in good contact with terra-firma earth and the TNCs supply derived one at the same time?


    Even if so , it is an acceptable risk to do so if this is only occurring occasionally, so perhaps consider if  this is any more frequent than say contact with a lamp post, or a light fitting in a metal frame bus stop, on a PME supply - which is acceptable.

    Something like a milking parlour or a building site has regular hand and feet contact time - I suspect this is not the case here.


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