can mcb's fail

[gazandlucy]

Sorry should have been here (uk electrics!)

I was changing over kithchen lights and when i turned the mcb back on ...nothing. all wiring is correct but still no power ...no trip or rcd trip??

I checked the mcb connection which isfine an when the top red wire outlet from mcb connected to next 6amp mcb(smoke alarm) all lights work??!!

Can mcb's fail? why and is there an underlying problem.

Thanks for any help!

 

[ericmark]

Murphy's Law is an adage or epigram that is typically stated as: "Anything that can go wrong will go wrong."

So yes it can fail. However the normal MCB has a fail safe to stop it from being held in the "On" position and once triggered it needs to be switched off to reset. Have you tried that? One can normally "Feel" a faulty MCB the movement resistance changes and by comparing one can often feel when not resetting. Also resetting with power off where there is a fault with circuit again feels different.

 

[ColJack]

yes they can fail..
sometimes they can stick so give it a few up 'n' downs.. if that fails, change it..