mcb

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  1. 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
  2. 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
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. 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
  11. D

    Can a 50a MCB be fitted into that space ?

  12. 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...
  13. 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...
  14. 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.
  15. P

    Cable and MCB size for oven and hob

    Good afternoon. I'm fitting a new kitchen with a new hob and oven. I hope to use just 1 isolation switch for both appliances. Together the wattage size is almost 11kW. Do I need 10mm cable with a 50A MCB? Is that right? Thanks.
  16. D

    Which is better BS1361 or BS88?

    Was wondering why was BS1361 replaced by BS88 even though BS1361 tends to have a larger breaking capacity according to the on-site guide if I'm reading it right, however, I maybe wrong. For example BS1361 breaking capacity can be 16.5kA to 33kA depending on what type you get, where BS88 is 16kA...
    • David345
    • Thread
    • 1361 18th edition amendment 1 amp amps better breaking capacity bs1361 bs88 cartridge cartridge fuse fuse fuse box fuseboard fused fuses mcb
    • Replies: 6
    • Forum: UK Electrical Forum
  17. V

    10A MCB protecting a Radial in a Garage.

    This should have been a straight forward install, and maybe it should be and I'm just being an a***, so be interested to know what you would have done if presented with the same thing. Got called out to quote for an Outdoor Double Socket to go on the back of a garage. The house is reasonably...
  18. sajeel

    transformer tripping mcb

    Evening peeps, Got a question i need help with a friend of mine has an american food processor the unit is 1000w 110v i purchased a 3000 w 230 to 110v step down and stepup transformer have set to 240v on input and using 110v output. I am finding due to surge sometimes on start up the...
  19. HappyHippyDad

    Is a Chint MCB identical to a control gear direct MCB (or lewden)?

    I was carrying out an EICR today. The consumer unit was a Control gear direct board. It had one chint MCB in it which had been put in recently. It looked absolutely identical to all the cgd MCB's. Is Chint in any way affiliated with CGD/Lewden or is this just a coincidence?
  20. M

    UK MCB screw won’t undo - what would you do?

    Curious what you would do Screw holding ring final circuits live wires in MCB wont unscrew , it’s literally a ground out circle from what was originally a Philips head screw Therefore couldn’t do end to end continuity I did end to end from socket instead, MCB probably needs to be changed...
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