mcb

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  1. C

    Deta 20a mcb

    Help! Does anyone have a deta 20a mcb 6 or 10k. I’ve got a faulty 20a mcb that I’d like to replace so I don’t have to do anything more involved to split a ring main with open neutral end to end continuity. It’s an old er version where the switch is black and the busbar splits around the bottom...
  2. L

    Type B MCB tripping at higher current rate than cable capacity

    Can someone please explain me how type B MCB can protect a cable if it only trips when current is 3-5 times maximum load? Let's say, 2.5mm radial circuit is protected by 16A type B MCB. Prysmian 2.5mm T&E current rating is 27A. How will 16A MCB protect the cable from overheating and burning if...
    • Luka
    • Thread
    • cable capacity current higher mcb tripping type type b
    • Replies: 9
    • Forum: UK Electrical Forum
  3. S

    MCB in an 85x85x45 box

    Does anyone know of a plate that accepts an MCB?
  4. R

    Spd supplied of exsisting mcb

    Evening , been to look a job this evening for an additional socket in kitchen . When checking out board an spd has been fitted but the supply is is coming off an 20amp mcb that looks like it is feeding a small radial circuit . Is this a total no no . I think it is and I have explained to...
  5. S

    Immersion fuse or MCB?

    An immersion heater 3kW, say off a final ring. A number of points. Is is best have a 13A double pole FCU switch or a double pole 13A type C MCB? A fuse is one-shot. If it blows the danger is eliminated until seen to. The MCB in a local enclosure doubles as switch but can be switched back on by...
  6. S

    Consumer unit MCB selection

    Hi , looking for some advise please . So we had new house house rewired a year ago and had foresight to ask sparky to add MCB for garage with wire terminated in enclosure on outside of house in anticipation of extending it to detached garage at a later date once the internal renovation was...
  7. clanky

    UK MCB's vs Cartridge fuses

    Hi all, need to pick the collective brains as im concerned about a recent problem. We have a few freezers here on our small holding and one of them started playing silly buggers. Eventually the 20A MCB kept tripping so to make sure it was the freezer i put it on a different circuit with a 16A...
  8. M

    UK changing or swapping a MCB

    Hi, I have a garden studio that is fed from the main consumer unit in the house. It is wired into a B6 MCB on a radial circuit which is fine but occasionally, if I use something that draws too much power the MCB trips. I use power tools which work fine as I only use one at a time obviously, but...
    • mmichael stath
    • Thread
    • changing consumer unit mcb wiring
    • Replies: 13
    • Forum: UK Electrical Forum
  9. D

    Disconnected neutral wire from shower MCB in CU

    Good evening! Recently, after a friend’s shower stopped working, an electrician allegedly disconnected the neutral wire inside the CU, to make the shower safe and isolate the circuit. Subsequently another electrician on visiting the house, unaware of this method (if it even exists!?) concluded...
  10. O

    Does a SPD need a dedicated MCB?

    Does a SPD need a dedicated way? I need an extra way in this unit for a 3 phase car charger As you can see its a small unit with no extra ways, the building is rented and the tenant is adamant that the board is not to be changed as he has been told no major alterations. We have already...
  11. J

    Is it possible to put a 16mm swa on a 40a mcb protected by an rcd

    Is it possible to put a 16mm swa on a 40a mcb protected by an rcd
  12. strider6

    EVSE and RCD Questions.

    I'm obviously still new and learning about what I can and cannot do, but essentially I want to install an EVSE at my own house for an electric van, I intend to run a 6mm T&E in surface trunking/clipped direct, through a drilled hole in the wall and then out a wiska box through some flexible...
  13. TheArcMan

    UK Selectivity, mcb vs fuse...

    Hi all, Been browsing these forums for a while, always great to learn a new way to skin the same cat. Anyway, cut a long story short, was an apprentice for a top spark, he packed it in for a new 7 figure income career. I then took a break thinking I should do the same, then I realised not...
  14. M

    Trip MCB at times RCD too intervals days or hours; test if faulty appliance

    Hi I am asking for help as a novice and 1st time user of this forum. Recently started to experience tripping of MCB & sometimes with the RCD at random times, intervals can be days after resets or several hours. Could an appliance or appliances be overloading the circuit? How can I test an...
  15. cliffed

    comply to Regs to install a MCB for the Sub Main to the 1st Floor DB

    Replacing DB’s with all singing all dancing RCBO’s Problem’s we have now…Existing installation consisted of DB Grd Floor.. DB 1st Floor…Grd Floor DB supplies 1st Floor DB…16mm T&E installed IN fabric of building. DB 1st Floor supplies Remote Garage Block 16mm T&E With the Sub Main to DB 1st...
  16. A

    MCB WYLEX b6 6 amp are they repairable?

    Have 2 of the wylex MCB b6 6 amp breakers that I've had blow, are these repairable ?
  17. W

    Can you feed a RCBO with a MCB

    So here is the thing Rhere is an old MEMSHIELD TPN+E Board that is pretty mich obsolete. The only place that sells their breakers would be Ebay right. After having EICR done on it it's been flagged that It requires RCBO/RCD for sockets right. So here is where we are at It's not really...
  18. M

    hi all what is BSEN number for wylex nsb mcb is it 60898 ?

    hi all NSB 32 wylex mcb what is the bsen number is it 60898 ?
  19. N

    40a MCB to 2 gang socket - want to spur off to FCU at 13a for freezer over winter

    Hello everyone, We had an electrician over, who fitted a 40a MCB in the house consumer unit to supply a new build garage. It's underground SWA, in conduit also. He temporarily fitted a 2 gang socket so we could use power tools whilst we complete a fitout internally, although in that use case...
  20. L

    Ceiling rose connection tripping MCB?

    Hi guys, I have recently encountered that my circuit breaker for the upstairs lights keeps tripping. I flick it back on and immediately it trips off again. I think the issue is coming from the bathroom light. So I have had a look at the ceiling rose and the picture shows what is going on. Note...
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