Lighting circuit trips both RCD's | on ElectriciansForums

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adam.h

Looking at some kitching lights, there are two downlights and 4 under cupboard lights on one switch.
Found it to be linked in the switch to the other lights so assumed it had a shared neutral.
After removing the downlights with then go on to connect to two under cupboard lights the first two work fine.
Even removed the neutral and borrowed one from the nearest light to see if ti made a difference. alas, no change.

The line that went to these last few lights was swithing on with the switch so was working fine. But I added a single load to it and it tripped. So when a load was added it tripped both RCDs.
anyone know what it may be? Unfortunatly I didnt have a tester so couldnt do any IR testing. (just had a standard dmm.
thanks
 

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