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here we do the loop into the lights...im guessing you would leave the cables disconnected from  the consumer unit end safely and then go to each switch on the circuit doing an insulation test until you get a rubbish reading and it will tell you that the fault is likely to be on the bit of cable...

wouldnt you remove the cables for that circuit so that no other circuits can affect the results and use the croc clips to test with ? so that  needs investigating as its below 2 megaohms and it  would show that there is an earth fault somewhere on the circuit which means there may be a break or...

ahh yeah i was thinking about the mcb ...  well i have a fluke multi-fuctional tester so it would go onto the insulation setting at 500volts and would be measured in megaohms.... then measure between the l-n, n-e, l-e..... the perfect reading would be ≥500 so the higher reading the better

possibly a short circuit? wouldnt this be picked up on an insulation resistance test? it could be picked up on a continuity test however as its a short circuit there may be an alternative return path ... or have i got that mixed up? 

I am currently doing a level 3 electrical course. we are having to do a portfolio as we go along. the electrician i have been put wit isn't very helpful. i have done most of it but i am struggling with the fault finding. i just wondered whether anyone could help me with examples of electrical...