mcb

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  1. old man sparky

    Here we go again, 6mm cable x 10kw shower x whack a 40A mcb in.

    Just been to another one of those !! Plumber replaces shower for upgraded version. 40A mcb replaces 32A. No problem mate !! that will work fine. So 12 months later the owners girlfriend moves in with him. So that poor old 6mm that was just starting to break a sweat for 12 months, suddenly...
  2. S

    Strange MCB trip

    Hi all, Had my downstairs ring final circuit trip the B32 MCB today. The missus was in the kitchen cooking and had apparently put the kettle on and as it was close to boiling the MCB tripped. I therefore assumed it would be due to the kettle so I checked the 13A fuse in the kettle plug but it...
  3. M

    Intermittent tripping MCB

    I’ve a fuseboard as pictured, which has been nuisance tripping on the downstairs ring final circuit. It started off with 32a breaker tripping which is RCD protected, and now it’s tripping the Main RCD switch. This is a relative's property and he’s already had an electrician in, who’s ran a...
  4. I

    32a mcb on a 2.5m radial

    Is the above OK, its feeding a fused spur downstream with a combi boiler attached to the spur. Cheers
  5. Rockingit

    Where to find Moeller MCB?

    Anyone know if Moeller parts are still around? And if so which wholesaler to try first - need a couple of 1p MCBs
  6. D

    Calculate 3 Phase MCB size

    Hi..I should probably know this but don't do too much 3 Phase stuff!! Can anyone give the formula for working out the size of a 3 phase MCB? I have a 12kw 3 Phase fryer to install. Cheers
  7. C

    Just installed a new 9.5kw shower, and sat the mcb on the bus barr, and there doesn't seem to be enough power to turn on the shower,

    Should I wire it straight to the live cable and not use the bussbarr
  8. A

    Wylex 6A plugin MCB

    Evening all. My neighbour just got me out the shower as he has no lighting. He's got an old wylex consumer unit with retro fit MCB, the one with the red button to trip. Anyway after removing the cover found nothing between L-N and L-CPC out going on both lighting circuits, but power on the...
  9. I

    Second radial line to 16a MCB

    Hello I am new on this website and first want to say hello to everyone. We moved to a house with old night storage heaters. We had to replace one in our bedroom this winter. The new electric radiator is 1,1kw with a plug. Night storage were hard wired 2,5mm cable with 16a mcb on night economy 7...
  10. S

    My MCB is ON but no current.

    Hello, In my kitchen, I make multiple sockets that are controlled by one MCB. For some weeks, I don't know why the MCB used to trip and I used to turn it back ON. One day the MCB didn't go to the off position but all those sockets stopped working. I pressed the test button on the particular MCB...
  11. W

    More than 1 circuit on mcb

    Hi, recently carried out an eicr at a rented property. There were 5x 1mm in a 6amp mcb for lighting.. my question is what code should I be looking at for this?? I am sure I have heard someone mention or read somewhere about overpopulating an mcb should be a code 2... but then i have also heard...
  12. E

    MCB operation & cable length

    I'm currently just at the start of my electrical training so please excuse what may be a dumb question. It's a few weeks till I'm back at college and so not able to ask the question there. I want to understand a bit more about cable length. If you're using an MCB as overcurrent and fault...
  13. A

    13A BS1363 socket-outlets on a 40A MCB

    Hi. I found a radial power circuit on an EICR yesterday wired in 6mm2 flat twin PVC cable and have some concerns. I know that the MCB is designed to protect the cable but what about the terminals of the sockets? 13A socket-outlets are rated to 20A max and I am not sure they are designed to have...
  14. HappyHippyDad

    Oven and hob on same MCB and diversity.

    I've just spent an hour getting bogged down with the maths trying to work out diversity for 2 cooking appliances on the same circuit (32A MCB) and same isolation switch, I thought I would give my workings so others can use it as I wonder if some just assume you can still use the 15kW maximum...
  15. B

    BS 3871 mcb on EICR

    Hi all, Do you know when BS 3871 Type 2 MCB's where not allowed to be fitted to a new circuit? How should they be recorded on a EICR, as a BS 3871 Type 2 or BS 60898 Type B? On the EICR they have been recorded as the latter. Many thanks B
  16. D

    Can a 50a MCB be fitted into that space ?

  17. C

    Lighting MCB intermittently tripping

    Lighting MCB started tripping over Christmas. Sometimes you can reset right away, and sometimes maybe the next day, which makes me think dampness due to snow etc. It can trip in the mddle of the the night , when no lights are on It always takes out RCD, but isolating the lighting circuit means...
  18. G

    How do you wire your EM lights? Brown and Black cores in MCB

    Evening gents. Level 3 trainee here so forgive a maybe stupid question but I came across this today. EM lighting circuit, two cores from 4 core SWA into MCB. Brown core switched live off to two way switching, black perm to EM maintaince keyswitch. Maintained colours throughout circuit. Seemed...
  19. Pretty Mouth

    Series arcing causing MCB to trip

    I recently fixed a fault on a lighting circuit. The fault became apparent after some work I had carried out - I rewired part of the circuit for an ensuite refit, plus some additions to other circuits supplied by the same CU. I needed to provide RCD protection to the circuits that I had worked...
  20. J

    MCB sizing

    Is there any issues in having 10amp breaker if the circuit is pulling just under 6 amps? I know the breakers there to protect the cable and the cable is 2.5 3 core armour. Just curious.

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