mcb

  1. J

    Selection of MCB for SPD protection

    Hello, I need to install a type 1+2 SPD into the main panel of a small business building, which needs lightning protection. The main breaker in the main panel is a 4 poles 40A MCB. I was looking for a SPD and I found this: Schneider A9L16634. In the technical specification sheet it says...
  2. buzzlightyear

    need max for old mcb

    any body got the max ohms for old dorma smith mcbs , I asked dorma smith years ago sent me max ohms for old load masters .
  3. F

    C50 MCB

    Does anyone know where I can get an old Crabtree C50 type MCB from?
  4. M

    Intermittent mcb trip electric gate

    Hi, just registered, I qualified in 1973 and and not done much electical work for the past 30 odd years but I obviously have grasp of the theory. I have an intermittent mcb tripping on my electric gate, which I installed. (All electric no hydraulics) The mcb will trip in any weather...
  5. newfutile

    6mm T&E on 40 amp mcb

    while doing EICRs i often find this combination, if its clipped direct it dont worry me however many times i have no idea how the cable is routed im just wondering how others would code this?
  6. K

    Need a different mcb

    Hi al it’s not. DIY job I’m aware of that. But I have just purchased an electric range cooker. Had an electrician out to extend cooker cable and he told me the instructions Manila of the cooker required a 40amp MCB. I’m not really in the market as of yet to be changing the consumer unit and I...
  7. Ashley-Joseph

    Spur from 32MCB

    Just wondering if I got this right but is it ok to take a 2.5mm spur from a 32MCB ring main Or should I use 4mm cable.
  8. coolsparx

    Old Crabtree Starbeaker MCB Compatibility

    Does anyone know if the current Crabtree 61/B32 Starbreaker 32A SP 6kA Type B MCB will fit the old board pictured?
  9. Sparked Out

    Spur off a spur.... make safe with 16A MCB from ring?

    Just recently has some work done on a conservatory, and in the process discovered that the 2 double sockets are not part of a ring main... looks like one is a spur off the back of a ring socket in the main house, and the second is a spur off of that :eek: So, question is, if I replace the ring...
  10. J

    Wylex Stotz PSB 63A MCB

    Does anybody know where I can source an old style Wylex PSB 63A SP MCB? It's to fit an existing 3 Phase Distribution Board with fork style busbar. Thanks in advance.
  11. A

    Oven won’t work...unsure issue.

    Hello, My cooker (LOGIK LFTC60W16 oven with grill and 4 hobs had it maybe just over 2 years) stopped working about 2 weeks ago. I found out we have no cooker switch on the kitchen wall so checked the Circuit Breaker box. Everything was on. With no other option I left the cooker MCB switch in the...
  12. The Flyinhos

    Cheap MCB lockout devices

    Had these arrive today, thought it was quite a bargain. 10x lockouts for £9.00 including VAT and delivery. Thought they maybe cheap n nasty, but pleasantly surprised. Can't knock em for the money. https://www.amazon.co.uk/dp/B07FDZNTG2?ref_=pe_3187911_264767211_E_301_dt_1
  13. W

    Body’s resistance with mcb only

    If there’s 230v and the body’s resistance is high .. Meaning the current will be very low but enough to kill you. Can we get electrocuted without having a 30ma rcd to stop this as the 6amp breaker will not have tripped ?
  14. Marcus Vaughan

    Type C MCB needed for EV Charging?

    Hi all, I've not a lot of experience with EV but was called to a local job to investigate a loss of power to a 32amp 7.2KW EV charger. It turned out the 32A MCB (Type B) had failed, and would not even operate when completely removed from the board. I happened to have a matching Contactum B32...
  15. T

    Lock Off Device for Triple Pole Main switch & MCB

    Hi all. I am undertaking an assessment next week called SAFE ISOLATION OF SUPPLIES. It involves isolating and securely locking off a circuit to be worked on. The 4 items to be isolated is THE WHOLE INSTALLATION, A 3 PHASE CIRCUIT, SINGLE PHASE CIRCUIT & LOCAL ISOLATION (which is an isolator...
  16. T

    Type of MCB .........................

    In domestic when the Zs easily low enough why do we default to have type B instead of C curve MCB's/RCBO's
  17. R

    Sub panel: Underrated MCB?

    Hello all A quick question about an existing layout if I may. The layout consists of a main CU connected to a sub panel via a single 63 amp MCB. A Dorman Smith K1PC63 to be exact. Total potential load on the sub panel is 25Kw. Routinely all of that load is present on the sub panel...
  18. C

    Max zs on double pole mcb

    I am filling out test sheets and have a merlin gerin D32 C60 HD double.pole mcb. The rating on the mcb says 415V feeding 2 feeds to a canalis busbar. BS7671 States max zs for D32 0.4 secs is 0.34. Is this just for single pole MCB? I have also check my max zs value from manufacture stating...
  19. C

    Appliance tripped MCB after....

    Carried out an eicr and noticed x2 double sockets have reverse polarity that supply a frying machine at high level. (this was a return visit to correct the faults) After correcting the reverse polarity on the two sockets i plugged the fryer back in and the circuit MCB tripped out and the...
  20. R

    mcb and cable size help

    Hello all I've just developed a wiring fault on the only ring main, after spending a few days attempting to find it and being pretty appalled by my findings. I have decided to re-wire the house. I have just spent all my spare money on a cruise so I guess I will have to get "Me sen ltd" to do...

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