Hi quick question. Was pre testing today with a view to changing cu in a day or so. Did a IR test from a socket on the downstairs ring results being L-N 1.67 M ohms L-E 1.54 M ohms and N-E dead short. I repeated the test at the cu with the results being L-N 196. M ohms N-E 201. M ohms and the L-E being 1.84 M ohms. Ive been round to every socket on the lower ground and nothing plugged in. Knowing that from the cu that the results are a pass as they're over 1 meg but require investigation, the question is why have a got a dead short from the socket I tested? (also from another socket). Thanks
Did you test end to end of the ring in CU? Maybe there's a N-E fault somewhere within the ring but the cpc has been disconnected somewhere before it gets back to the CU?
So if the main switch was turned on the neutral and earth were connected together hence your s/c result.
Just put L+N together and test against E at the CU. There are is probably something plugged in that you don't know about.
All kitchen ripped out along with dinning room every outlet exposed, living room, hallway all sockets checked nothing plugged in.
Well just test L+N against E and if there really is a N-E fault that will also show as 0.00Mohms. You need to disconnect the L, N and E from the CU else you will be testing N and E of all the other circuits.
Leaving the N and E connected at CU is going to cause you issues with even the main switch open. The N is common to other circuits via the CU. Perhaps another circuit has a fault you're picking up. Always test IR at the CU, disconnecting the neutral of the circuit, and opening the MCB. Leave the earths connected.
Sometimes a faceplate screw can graze a neutral wire stuffed into a metal backbox, may be worth unscrewing the sockets one by one if all else fails?
With the readings i'm getting from the circuit at the cu is the low reading from the L-E likely to cause any problems when the new split load board is fitted?
It is not wrong it doesn't make any difference whether you leave the cpc connected or disconnect it. Disconnecting it means you are testing only the wire under investigation. What was the word in asterisks? Mine was a rs e
You always leave the earth connected. What if the L or N is faulty through something else such as an earthed immersion tank, a metal clad socket fixed to a steel purlin etc? What if a joint is full of water and has a low ins res to true mother earth? How woud you pick this up if you're disconnecting the earth from the earth bar? It's wrong. It's in to guidance notes. It's practiced by all normal sparkies. Disconnecting the earth is not helpful, it's a hinderance. Quite worried with your obsession with my ar se. My asterisked word? Can't really remember, but several fit.
Reg 612.3.1 However, having established that there may be a fault it is then a fault finding test not a verification test is it! I knew you would eventually **** me off.
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