mcb

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  1. Shafiq Azmi

    Why MCB and Fuse cant protect Voltage Surge?

    Hi Everyone, I got some Power Module damaged cause by Voltage Surge. My device protected by 25A MCB and Fuse. Why my device still damage although its already have the protection? Any other way to prevent this from happening again?
  2. Rarbur

    Lighting circuit trips RCD but not MCB, can’t find E-N fault

    Long shot but thought I’d try, have a lighting circuit that trips the RCD as soon as the neutral touches the neutral bar for said RCD. Bypass that and it works fine just on an MCB so would think earth-neutral fault, but doing an IR test between N and E shows as a pass (>99M ohm). So unsure of...
    • Rarbur
    • Thread
    • ausie elec circuit fault lighting lighting circuit mcb rcd trips
    • Replies: 6
    • Forum: Australia
  3. Dvyj123

    Hottub mcb selection

    The hottub is 8.1kw so will be 35A max output , I’m going to put it on 6mm 3core swa to an isolator then to the hottub. Would a 40a b type be sufficient for this ? Or would it be better to put it on a 40a c type mcb? Thanks
  4. D

    How to calculate an MCB size

    I am doing a campervan conversion and have a 16A/250V shore power connection coming into a consumer unit which has two breakers - one for the AC input into a Victron Multiplus inverter and the other to go to a plug socket for non inverter loads. I would like to know how to size the MCB for the...
  5. M

    UK RCD rating in Sub board less than suppy protection

    I have a 40amp RCD downstream of a 50a MCB (10mm csa cable) should the MCB be lowered to protect the RCD from overload? If so why does this not apply to RCD devices in Split Load boards
  6. R

    Smeg 19.5kw 53amp mcb

    Evening , got to wire in a smeg 19.5kw TR4110IGR Using diversity I work it out to : Total load 84.7 Diversity: 10amp 30% of 74.7= 25amp Total = 36 I would fit 40-45amp breaker on 10mm clipped direct. No insulation and no cooler socket ? Am I missing something with Smeg and why they want 53...
  7. Michaelwgroves

    Boiler circuit 16A MCB

    I'm following a spark who used an existing Panel Heater circuit, for new gas boiler circuit 6 months ago. The panel heaters were removed, so it's now a dedicated boiler circuit. I'm doing an EICR. I've found a number of faults; 1. No grommet in Consumer unit knock out, used for gas bonding (It's...
  8. archee

    2.5mm2 on with CPC cut off to 32amp mcb Is this normal ?

    Hi, A question to all the sparkles out there who could explain this mess to me please. Bought a house built in 2000’s found this 2.5mm2 cable running to loft for radial sockets via FSU ( they had 3 amp fuse in there lol ) connected to mcb 32a as you can see for some reason they decided...
  9. P

    UK Volex Mcb replacement

    Hi i have a volex Vcu14 consumer unit and need a couple of 32A mcb's but have been discontinued and I don't really want to buy a second hand one. Is there an alternative option or make I can use? Thanks in advance
  10. saucyjack

    Garo MCB equivalent?

    Hi people; could anyone tell me if there is a straight substitute for a Garo 3P (40A) MCB please? I appreciate the whole mixing manufacturers/not ideal situation, but needs must I'm afraid. Many thanks in advance!
  11. O

    SPD's need their own MCB?

    Hi, now everything is SPD's I've been told they need to be on their own MCB. So incoming line goes through the main switch then busbar then MCB and into the SPD, SPD neutral joins into the incoming top of the main switch, and earth attaches to the CPC busbar. I think. What stops the MCB...
  12. Raptor0014

    Compatible MCB for Crabtree Powerstar

    Does anyone know offhand which SP MCBs are compatible with Crabtree Powerstar 3Ph boards? I need to take a 60a supply from this board but I can only find used ones on eBay and the company don’t want to buy used stuff. I can’t seem to find them new anywhere (probably me not looking in the...
  13. O

    MCB size and wire size for an electric oven and induction hob

    Hello I have two new appliances Electric oven rated at 3.95 KW Induction hob rated at 7.2 KW total of 11.15 KW Currently it is on its own supply with a 10mm Twin and Earth and the MBC is 32amps Can you please advise if the following Cable size is sufficient ( behind plaster ) MCB Amp...
  14. D

    Dropped MCB onto tiled floor, damaged internally?

    Hi folks, quick question, I dropped a C16 MCB from 5 feet up, onto a tiled floor. No visible damage so I put it back with the others. Could it be damaged internally so as it would allow current to flow but fail to actuate in the event of over-current? Or is it a case of, if it's damaged, it...
  15. M

    Double pole mcb poles

    I've a C63 10kA DP MCB Is there usually protection on both poles or is 1 pole a switch?. I'm not seeing any markings to indicate either way. Cheers.
  16. A

    Can Wylex plug-in MCB be tripped by anything but overcurrent/short circuit?

    Hello, I have an old 16A Wylex SK type B plug-in breaker in the fuse box in my garage which keeps tripping, and every time (and only at that time) the 32A one of the same type supplying the whole garage in my home's main box also trips. It isn't happening fast, sometimes it takes days to happen...
  17. G

    Can I use a mcb as main switch? And also RCD protection? Read

    So as the title says can I use a mcb as the main switch. Basically to keep it short I’ve took a 25mm sub main to power an outbuilding. Mains coming in will be Henley blocked and new tails will go into enclosure with b63a mcb which then feeds 25mm swa to outhouse which contains its own c/u which...
  18. u2v2w2

    Isolation sliders getting stuck on 3 phase distribution board to the point of partially braking off

    Anyone else had the same issue? Since this company keeps replacing machinery very often the MCB's get changed a lot so over time the slider contacts doesn't engage properly anymore.
  19. LewisM

    Help with finding MCB

    So a friend of mine has a new build (2020) typical new build lashed in. Hes getting an electric car soon however fitting a charger will be a pain in the backside as the meter cupboard is in passage on the side of the house the fuse board is fed by a sub main and is in the toilet under the stairs...
  20. T

    two SPD's in CU , one for zappi MCB and one for the rest of circuits.

    hi guys please help 1. i want to install zappi into existing CU with a type2 SPD should i also protect 32A MCB for zappi with an SPD? 2. i have CU(hager VML410AH) with type A RCCB incomer only is it ok to fit SPD onto it? thanks

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