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Fault on external lighting roughly 12 lights around a building, RCBO tripping, my tester only goes to 200 Megger Ohms
L-N is 0 Megger
N-E is greater than 200 Megger
L-E is greater than 200 Megger
LN-E is 150 Megger

Now tested insulation from board and roughly found the middle light with 1 cable so must be joint boxes somewhere I can’t find, went to a light further and found a joint box and tested each leg and was getting near to no Megger Ohms on each side, any further ideas?
 
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