mcb

  1. A

    En suite lighting not going on .

    Guys looking for a bit of advice. Our Mcb on the consumer unit was tripping constant even though nothing was plugged in. Both bedroom lighting and en suite lighting come under this MCB. However until recent both bedroom lighting remain on and the mcb doesn’t trip but the en suite lighting won’t...
  2. D

    UK Radial Circuits Wired in 4mm and 32A MCB

    Guys needvadvice please I was asked to carry out an annual inspction of a DB recently There are 12 in number radial circuits suppling sockets wired in 4mm singles protected by 32A mcb the cables are enclosed in metal trunking and supply 13a socket outlets , are the mcbs now overated as the...
  3. newfutile

    3 phase SPD MCB size

    Does anyone know what size cable to use for a MCG type 2 SPD (3 phase) and what MCB.the manufacturers instructions don’t state any values! also should i use 3 x single phase or a 3 phase MCB?
  4. R

    What’s an alternative MCB that I could get off the shelf?

    Just wondering what alternative I could get for this Siemens mcb? (B16A 230v)
  5. timhoward

    Checking Crabtree MCB compatibility

    I'm working off a photo and haven't been there yet - I think these are Crabtree Polestar breakers in this old 3 phase board? Do the slightly newer design fit that CEF peddle fit? thanks.
  6. A

    Two 16amp ovens on 32amp mcb B supply

    Hi, I am replacing an old double oven with 2 new small ovens. The old oven is wired into a dedicated supply with a switch and the consumer board has a 32amp MCB B breaker. New oven 1 requires a 15 amp fuse and 2790W. link below. https://www.zanussi.co.uk/kitchen/cooking/ovens/oven/zohnx3x1/...
  7. Scott J Walker

    UK Post Smart Meter Main Breaker Tripping Intermittently

    My grandparents are having problems after the installation of a smart meter (against my advice) and now the circuit breaker trips intermittently during the Day part of Economy 7 with no other discernable pattern. Sometimes it will switch off after being toggled on again before a few minutes...
  8. A032701

    Series E MCB Compatibility

    Evening All, Anyone know which major manufactures are compatible with the old GE series E mcb style? Thanks in advance.
  9. deliveryguyuk

    UK Required MCB for Doorbell Transformer

    Hi guys, I’ve just looked in my consumer unit and I’ve got space for an extra MCB and a rail transformer for my ring doorbell. I’m planning on adding a matching mcb however I don’t know if I need a 3A, 6A or 10A version. The transformer is British General Fortress 8-24V AC 8VA Bell...
  10. Msitekkie

    OK to swap B MCB for Type C or does my C load have to go on it's own breaker?

    I have a customer who want's me to fit a 3Kw Patio heaterto a garage. - I believe this requires a Type C breaker. There is limited space in the board, so wanted to get peoples views on whether it's OK to swap an existing B type (used for sockets) for the C type, or whether the C type load needs...
  11. A

    40 amp MCB live when off? Faulty?

    I have a number of circuits in a not very old Hager sub CU, with split RCDs. All of the active circuits (8 used in a 12 slot dual RCD CU) test fine. RCDs tripping fine under test with Megger MFT. However, I have a MTN B140 (40 amp obvs) MCB in the board that has nothing connected to it. ie...
  12. K

    Which Type 2 SPD (preferably without the need for separate MCB) will Fit inti ClipSal CU

    Hello, I have a Clipsal consumer unit with two "ways" unused and blanked off and potentially a third available as the Proteus Geyer B16 MCB is labelled as "spare". This consumer unit only contains the main double pole isolator and MCB's. Please see the below photo. I am getting an EV charge...
  13. D

    Impact Driver Vs MCB

    Every big build I have had the pleasure to work on the last 10+ years I would say 99% of the sparks use their 18v impact to do the consumer unit connections Good practice as its fast and effective Or butchery and will lead to knackered switch gear
  14. D

    sizing up mcb and a contactor

    I have a servo drive that is rated 10AMP. It then has a second rating refered to as it's Peak current : 30AMP 1) Do you size a MCB using the Peak current rating or the standard rating? 2) Again when choosing a contactor would you go for one closest to it's peak current rating or standard...
  15. newfutile

    C2 or C3 ? Wrong brand of mcb

    Which code would you give to a Wylex board populated with Hagar mcbs ,Wylex main switch and Wylex rcd. Wylex once told me that nsb and nh breakers are not allowed on the same busbar !
  16. B

    Problems with Axiom MCBs

    Hi, does anybody know what other brands of MCB (if any) will fit an axiom consumer unit? I need a C32 breaker but i cannot source axiom C curve breakers anywhere. The initial problem is my Plasma cutter trips the B32 breaker as soon as I touch the trigger, and i cant think what else the problem...
  17. A

    Can multiple motors share 1 mcb.

    Hi, I am installing 24 No 2.2Kw 3Ph motors that will drive cooling fans. The plant room for the install is not what you would call spacious so trying to keep everything as tight as possible within reason. The motors are all controlled through an automated system which feeds back to an...
  18. A

    New 4 way CU being fed from 50A MCB on old CU

    HI, I ve briefly asked about this setup before but now asking about the load on 4 way...... is this Ok/Safe ? I have a plastic 10 way CU.....one of the 50A MCBs from this has been used to feed the new 4 WAY metal CU. The new 4 way METAL CU has an 80A main switch (30Ma) and 4 MCB's (50a,32a,32a...
  19. N

    MCB type not listed in drop down box

    as title says, just doing an EICR and cu has MK switchgear, the BS number is not available in NICEIC dropdown box and cant insert it manually either. any ideas ? picture attached
  20. B

    Main fuse blows before MCB.

    I wonder if anyone can suggest a scenario that could have made this happen. I did a full rewire on a two bed purpose-built flat a few weeks ago. TNCS, cut-out in cupboard at the stair-well, I ran the tails to a switched fuse inside the flat and on from there to the consumer unit. All tested...
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