pme earthing

[hodaire]

just been to have a look at some electrical work on a house, underneath the main fuse there is a trafolite label saying PME system but the supply authority haven't supplied an earth, someone has clipped a 6mm cable down the side of the house and buried the end in the ground (stripped a foot of the end of the cable) ze is 300 ohms.

do i just need to get onto the supplier to provide an earth and if so why wasn't one provided in the first place

 

[nickblake]

PME is protective multiple earth ,TNCS today the earth and neutral are connected at the suppliers cut out , on the side of the supplier cut out there should be an earthing block the earth should be conneted there

 

[hodaire]

there is an earth block, the only earth going to it is from under the floor outside, the supplier has not provided an earth, should i tell the customer to get onto the suppliers

 

[Sintra]

Isolate supply and disconnect 6mm cable out of earth block test Ze at earth block (not cable) if you get a reading of less than 0.35 ohms then you have a TNC-S. If this is the case you can connect into the earth block without involving the supplier.

You stated you had a Ze of over 300 ohms i take it this was an Ra reading on the cable.

 

[hodaire]

but with the earth wire connected the reading is over 300 ohms

surely the supplier should provide the customer with an earth?

 

[Sintra]

There is no requirement for the supplier to supply an earth.

You will have to phone them and check or install an electrode and keep system as a TT.

 

[ezzzekiel]

possibly pme inside the service head, but no earth connected to met

 

[nickblake]

sintra i asked Bill an NIC representitve at a conferance regarding the suppliers Earth according to him they now have to supply the earth

 

[chris gray]

our dno wanted £154 last time we rang them to supply one