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Spark123 - I think they were electronic ballasts. An IR test would not identify this would it ? That is if you can do An IR test on this type of circuit with electronic ballasts on ? Would the test method for this be to disonnect the whole circuit and then add 1 fitting at a time to the...

Thank u tonyelectric for the detailed explanation and the warm welcome :)

Spark123 they are as holmslaw has described them. Holmslaw - As this was actually a line - earth or neutral - earth fault the rcd was detecting the inbalance. is it correct to think this ? Maguire - For an insulation resistance test if done on this circuit at 250v with everything connected...

Thank u flameport for clearing that up for me. So because of the fault between line and earth or neutral and earth the rcd is picking this up and then is tripping out because of the imbalance. This has cleard things up for me alot. However with the cpc disconnected and if anybody had come in...

Hello people 1st post. I am a apprentice and I would like to clear up something. RCDs do they need cpc to operate ? As if there is no earth faulth path for the imbalance to flow down then an imbalance cant be detected ? The reason I ask this is because I went to a job with the person I worked...