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mcb

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  1. T

    Is what I've done any good/safe?

    Hi everyone, I've come here as a DIYer asking for professional advice/opinion. I have an 8.5KW shower on a 6mm cable and a 40amp MCB. The shower works fine........for about 8 minutes! It invariably trips out. Sometimes it lasts 6 minutes, sometimes it lasts 10. I was considering changing the...
  2. Q

    Short circuit bypasses mcb and trips submain mcb

    Good evening A cable was loose in a ceiling void causing a short circuit this didn't trip the 10 amp 6ka type b mcb but tripped the 50 amp type b 6ka mcb that supplied that board back at the mains. I am wondering why this occurred other than me thinking the local protection isn't very...
  3. T

    UK RCD TRIPS BUT MCB DOES NOT

    I have isolated the MCB feeding my garage when switched on trips the RCD. There is no load on the garage I have an internal switch in the garage that switches all circuits off. So the fault must be between the MCB and the garage switch. The armoured cable is under the patch so to dig up would be...
  4. F

    MCB TRIPPING WHEN TRYING TO OBTAIN ZS READING

    HAD AN ISSIUE WERE THE MCB WAS TRIPPING WHEN TRYING TO OBTAIN ZS READING TESTED METER ON OTHER CIRCUTS ALL OK TRIED DIFFERENT TESTER STILL TRIPPING MCB WHEN CARRYING OUT TEST CIRCUT IS ON AND ALL HEALTHY WITH MARTINDALE PLUG IN TESTER GOING TO SWAP MCD OVER IN MORNING ANYONE HAD SIMILAR
  5. I

    Radial circuit from 20A MCB

    Not sure if this is possible but just putting it out there... Current Situation Need to tidy up some of the mess in the garage from the previous owner of the house. Wires going all over the place. Additionally, all of the upstairs lights, the garage light and an external light are all radial...
  6. M

    RATE OF MCB

    Hello, Could you please help me, I would need to install Triton T40i Bath/Shower Mixer Booster Pump, this is a "booster shower" only and not an "electrical shower" whose specifications are as follows: Electrical Voltage: 240V Pump motor rating:73 Watt (nominal) Water Inlet connection ½” BSP...
  7. S

    UK Advice needed for garage power job

    Advice needed! Ive been to see a job for garage power, the previous electrician has taken a 4mm on a 32amp B MCB protected by a 30mA RCD. But hasnt done anything with, apart from the fact there is no protection and its T&E all straight forward. My ownly question is do i gland straight into a...
  8. Iain Stewart

    UK Inspection Report, Electric Shower, Merlin Gerin and Schneider MCBs

    Hello, We live in an old stone built ground floor flat, built in the 1880s. Obviously the consumer unit and cabling has been updated a number of times over the years by previous owners. One being the Local Authority who owned the property back in the 1960s -70s. We have lived here for 25 years...
  9. GBDamo

    Ramp testing an MCB

    Is there an over the counter device for this? Is it something that is done outside of a lab? Been asked a few times, how do you know it'll trip. Or when forced to use second hand MCBs it would be nice to check them.
  10. J

    2KW oven and 6KW hob on B32 MCB

    Can a 2kw (on a 1.5mm manufacturers flex) fitted oven and a 6kw hob (on a 2.5mm manufacturer's flex) be connected into a cooker outlet plate behind the cooker? The circuit is wired in 6mm t&e on B32 mcb. It has a 45A cooker switch with 13A socket in the kitchen (within a metre of the appliances)
  11. T

    Main RCD Tripping & Not MCB

    DIY expert tried changing his own Consumer unit from an old 3036 re-wireable CU to a 18th Edition (100A main switch / 63A 30mA RCD / 7x MCBs) I was called out because he couldn't get his sockets (ring main) back on - NEITHER CAN I, I HAVE TRIED EVERYTHING I THINK... The Lines are terminated...
  12. B

    UK Oven trip MCB

    Hi all, I’m hoping someone will be able to give me some advice on my oven. Tonight I had both ovens on (as has been done on several occasions). When I went into the kitchen about 10 minutes later I noticed the oven was off and had tripped the 32Amp MCB. I reset it at the CU and it came back on...
  13. B

    UK RCD vs MCB trip

    Evening everybody, I’m wondering if someone wouldn’t mind answering a question for me about RCDs. I had a water pipe burst behind my washing machine this evening, and once I’d isolated the leak I noticed the sockets had tripped. When I went to reset the breaker, I noticed that it was the RCD...
  14. J

    RCD vs MCB...

    Does an MCB protect against fault current in the same way as an RCD does? As in, both devices trip by way of detecting imbalance in the Line conductors and thus using magnetism to sprag the switch? I ask, because if so, I can’t get my head round why an RCD is better than an MCB. I know that it...
  15. L

    No end to end 2 Radials on one MCB

    Hello, I have tried to search the forum but have not found anything although this must have been asked a thousand times. When completing a board change for example and there is no end to end on the neutral does downgrading the mcb to a 20amp and effectively running two radials from the same MCB...
  16. N

    Tripping mcb and rccb

    Hi guys. Just want some advice or thoughts from the pro's. So I'm an engineer who works on espresso machines. Going back a few months ago now I got called out to a machine tripping the power, in my line of work this generally means one loop on the heating element has shorted to ground or one...
  17. N

    Why would spike lights trip an MCB as if a dead short is present ?

    Just finished installing 20 x spike lights in a customers front garden. 2.5mm SWA ran from existing junction box feeding existing fence lights. All pulling no where near 1A in total. When all connected and wiring tested, went to switch on MCB and it popped. Rendering the MCB useless as if L-N...
  18. J

    Electrician Jobs Looking for electrician to swap MCB in OL10 area.

    Hi. Im looking for electrician to swap mcb in my consumer unit for one suitable for single phase welder with max input current of 16A. In my consumer unit there is 32A type B mcb that was used with electric shower that is disconnected. I need it swapped for 16A type C (been told its a right...
  19. Z

    MCB trips ONLY when open in one go all lights together

    I have about 50 led spot lights + more light , all together is about 400w if I open them all in one go together, then the MCB [=6 am] trips immediately, but if I open them one by one I have no problems at all ! I tried to replace the MCB with another 6am and it did the same, but when i replace...
  20. 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...

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