Tell us about your faults!

[Richard Burns]

What was the voltage between the two line busbars when the RCD is off and the main switch on and all breakers off?
If 0 then busbars are connected, if 230 then they are not.

 

[Kate]

didnt test between both busbars, only did one busbar at a time to E or N
Main switch on and RCD off:
left busbar 230v to E or N
right busbar 0V to E or N

 

[Richard Burns]

Your continuity test was done with both RCD and main switch off?

- - - Updated - - -

Though the bus bars do look like they are in contact

 

[Kate]

yes, my tester has a panic attack if i do continuity on a live source
they look in contact, continuity proves they are.
Yet no voltage?!? thats why im confused

 

[Richard Burns]

Sorry I assume the supply was off, just trying to get to the source of the differing readings, obviously if the RCD was on then you would get 0 ohms continuity.

 

[Kate]

My tester wont do continuity on a live source. RCD was off for all tests, Main switch off for continuity, on for voltage checks.

 

[Bij Lee]

Went to a friends house to replace a switch. Couldn't isolate the circuit via MCBs on the CU. There were about 10 MCBs on a split board, both RCD protected. Switched off all MCBs but still couldn't isolate power. Had to use main switch.

 

[HandySparks]

Went to a friends house to replace a switch. Couldn't isolate the circuit via MCBs on the CU. There were about 10 MCBs on a split board, both RCD protected. Switched off all MCBs but still couldn't isolate power. Had to use main switch.

Did you not bother to investigate why?

Could either be fed direct off the main switch (unlikely) or, if you only tried one breaker at a time, the lighting could be fed off two breakers in parallel. Either way this needs sorting.

 

[sparkybob1]

After replacement db fitted the rcd was tripping when powered up. After investigation found a shared neutral on the stairs lighting. Was easy enough to rectify by altering wiring. What is your opinion on putting both lighting circuits on the same rcd?

 

[Bobster]

After replacement db fitted the rcd was tripping when powered up. After investigation found a shared neutral on the stairs lighting. Was easy enough to rectify by altering wiring. What is your opinion on putting both lighting circuits on the same rcd?

Simple tests would have shown this up before the board change.

I take it by easy fix you've just shoved both circuits on the same Rcd? So the lighting circuits still have a borrowed neutral?