The_Trician
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Try disconnecting the lighting circuit cpc from the board, the switch on and turn on the lights. Measure the voltage from the disconnected cpc and the main earth termianl in the board. If you get anything above around 50v you have an earth fault between the live and the cpc. If so, then the circuit is obviously not meeting the disconnection time and tripping out or fusing as it should under fault conditions.
Don't forget that during an IR test, you have to switch the 2 way switches over and test both ways to fully check the circuit.
TT
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