How good are you at telling the difference?
How good are you at telling the difference?
Wow since when did the simple act of earthing get so complicated! I don't think it was always so things really need simplifying. Any how that first picture can't be a real installation surely if the supply people left me with something like that ide be very dis chuffed. In my road we have earthing to the outer lead sheath of the PÌLC cable except for in a recently rewired flat above a shop which has PME ie the neutral and earth are joined in the meter cabinet, also the earth is joined to the water pipe and the gas pipe so fairly standard. The water pipe is metallic all the way down to the ground. So what would you call the overall system? There are at least two places where they've added a copper rod laid in the ground and tied to neutral. So is it PME PNB TNS or what. I found by chance that I can get a continuity reading between earth and neutral there's no link in my supply so it's a bit of an odd one.
recently rewired flat above a shop which has PME ie the neutral and earth are joined in the meter cabinet
I found by chance that I can get a continuity reading between earth and neutral there's no link in my supply so it's a bit of an odd one.
Even with TN-S there is continuity. The impedance should be approximately the same as Ze. If you start adding more N-E links, the value will fall. Parallel paths.
There are at least two places where they've added a copper rod laid in the ground and tied to neutral. So is it PME PNB TNS or what.
If they've multiply earthed the neutral it's PME (TN-C-S).
- Andy.
There are at least two places where they've added a copper rod laid in the ground and tied to neutral. So is it PME PNB TNS or what.
If they've multiply earthed the neutral it's PME (TN-C-S).
- Andy.
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