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I have a simple one way lighting circuit that serves one fluroescent tube. there is a single jb up in the roof. now when tested here i get a reading of >1999 Mohms for the insulation resistance test on the individual cables. but when connecte together i get 376Mohms at the junction box and 30MOhms at the CCU all for the same circuit! i want to energise this but am a bt worried as i cant visually see anything wrong and the individual cables test fine ... any ideas ?