MSB Fault

Our ground floor lighting MSB tripped the other day, but when flicking the circuit back on, the lights have not come back on - i would have expected the MSB to trip again if there was a problem, but it remains in the on position with no lights on.

I would be grateful for any ideas as to what may have happened?

you "spelt" it wrong so it is now offended

pablospamio said:

Our ground floor lighting MSB tripped the other day, but when flicking the circuit back on, the lights have not come back on - i would have expected the MSB to trip again if there was a problem, but it remains in the on position with no lights on.

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i would advise you call an electrician to come and install an MCB

These things are designed to trip even if you are holding the switch. So possibly if there is still a short on your lighting, then the mcb would have tripped again while you were trying to push it back on. This might have left it with the switch in the 'on' position, but actually switched off. I am told some mcb do this.

What was happening when it tripped? anything strange? did a bulb fail and cause it to trip? Anyone hammering in nails? mice eating wires?

Does it normally trip when a bulb goes? Again, was it a bulb failing which caused it to trip off. If it was, then concievably the mcb has worn out and just will not work. If there is no obvious explanation, then I would suspect the mcb is fine but you have a problem somewhere else.