Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 9 replies
  • Subscribers 39 subscribers
  • Views 1282 views
  • Users 0 members are here
Options
You may also be interested in
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

M.C.B. Failure number two. A B6.

Zoomup

After an old hot filament G.U.10 lamp blew, the lighting B6 M.C.B. would not reset.  After testing the lighting circuit and replacing the M.C.B. all was well. Is this acceptable that a breaker can be damaged in such a way, or are they all now of very low quality? The make was an Alto brand.

Z.

Parents
  • 0

    What is the pfc in the premises, and perhaps more relevant, at the GU10. Occasionally, considering consumer units and similar, if the fault exceeds the breaker max prospective fault current rating (say 6 kA), but not the assembly conditional rating (say 16 kA), the breaker itself may be inoperable after a short circuit fault operation.

    Alternatively, products can just fail after a period of time. Fortunately in this case, whether it's a mechanical failure or not, the product didn't fail dangerously. I would accept that fuses are, in all probability, less prone to not work when you need them, but they are a one-shot device.

Reply
  • 0

    What is the pfc in the premises, and perhaps more relevant, at the GU10. Occasionally, considering consumer units and similar, if the fault exceeds the breaker max prospective fault current rating (say 6 kA), but not the assembly conditional rating (say 16 kA), the breaker itself may be inoperable after a short circuit fault operation.

    Alternatively, products can just fail after a period of time. Fortunately in this case, whether it's a mechanical failure or not, the product didn't fail dangerously. I would accept that fuses are, in all probability, less prone to not work when you need them, but they are a one-shot device.

Children
  • 0 in reply to gkenyon

    2 little taps with an 8oz hammer to the top of the alto or merlin geraim mcb got me out of trouble many a tIme when on councill peace rate call-outs, same with the very old Wyler rccb main switches when they lost the spring strength within.

Community Rules & Guidelines