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hi bongos No. I have a split CU. On the left of the busbar are 2 MCBs fed from an RCD to the right of them. These feed outside circuits. In the middle are about 6 MCBs to interior circuits. On the right of the busbar is the twin pole master switch which switches power to the middle MCBs...

Chri5 outside lights were only 60 watts each .. small incandescents again. they are now removed. Kitchen lights are two 60 watt spots. Total load of both circuits is well under 6 amps I think. MCB trips even with nothing switched on anyway. Also, I didn't mention - I swapped the MCB...

Cheers for your advice johnd 1) OK - but cable ends are outside - how do I waterproof them? Those traditional circular brittle-plastic boxes are not waterproof. Should I use one of those new soft plastic squarish boxes with chocolate block connector inside? (as featured in dragon's den)...

First post so please be gentle. :) I am no sparks but am ok with basic wiring. Looked through forum but can't find exact problem we have. Have a 6 amp MCB in the CU feeding 2 lighting circuits - kitchen and utility room. The MCB trips after 10 minutes or so. Until then all lights work...