main switch

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  1. Andy C

    TT earth, Dual RCD or RCBO and Main Switch

    I have a replacement consumer unit coming upon which is currently off a TT system with a nice low reading on the earth. There is no chance of the DNO converting to TNCS. No SPD or AFDD as per client. I intend fitting a new Dual RCD consumer unit. I have researched this site and there was talk...
  2. B

    200A or 250A main switch

    This switch, 250A or 200A? I’m saying 200A but go online and put that XT3N 250 and all it comes up is 250A?
  3. 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...
  4. C

    Electrician Jobs 3 phase RCD main switch on Dis board

    Hi guys My friends are selling a house in France and they had an electrical survey which said they need to fit a RCD main switch on the dis board, the supplier has fitted an RCD at the main in coming cables but it’s about 20 yards away from the house and the survey said the dis board must be...
    • Cribby
    • Thread
    • 3 phase board main main switch phase rcd rcd main switch switch
    • Replies: 5
    • Forum: Electricians Jobs
  5. S

    Microwave dead after electrical main switch reset

    Hi everyone, I hope this is an appropriate forum to post my issue on. If not, I apologise. I've got a combi microwave/oven that's 7 years old. Never had any issues. Yesterday I had to do some work on the electrical wiring in the house, so I turned off the main switch. I had to do this multiple...
    • Spir4
    • Thread
    • after dead electrical issue main main switch microwave reset switch
    • Replies: 9
    • Forum: UK Electrical Forum
  6. Ian1981

    Mccb used as main switch isolator

    A question regarding the use of a mccb as a 3 phase main isolation switch to a DB. Is it a necessity? Current set up is I have a 3 phase 70mm supply feeding a DB. The origin of this supply is unknown, hence I’m getting northern power out to investigate as the main cut out earthing arrangement...
  7. M

    Using a MCB as a main switch

    My boss has just took over a new site and I went to look the layout. Some boards are damaged some cables need replacing and am sure some other stuff. The site has a old busbar with isolators feed various boards and of her isolators. It also has a board connected directly on to the busbar . The...
  8. B

    Main switch help please

    Hi is this a normal MCCB or MCCB with RCD I’m unsure cause of the earth leakage relay thanks don’t really know the settings on relay I’m apprentice thanks
  9. Tontoe

    Anyone know the BS number for Memera 21 board Main Switch

    I've searched the Forum for this, but not getting any hits. Doing an EICR and need the BS number. Any help gratefully received :)
    • Tontoe
    • Thread
    • anyone board knowledge main main switch memera number switch
    • Replies: 17
    • Forum: UK Electrical Forum
  10. andysparkfree

    100ma 100amp 3phase main switch on TT system and rcd protection on the rest of the circuits question

    Hi all , my question for your brilliant minds is (ill first set the scene) 35mm 4 core swa coming from an external supply, 16mm earth ran out to an earth rod(ze at the distribution board main switch 0.35ohms) now this is quite a large installation with a 3phase distribution board in the...
    • andysparkfree
    • Thread
    • 100amp 100ma circuits main main switch protection question rcd switch system tt system
    • Replies: 3
    • Forum: UK Electrical Forum
  11. B

    Calculating main switch size

    My friend, a plumber is at a job with a 63A 3 phase main switch, and the board has a few 20a circuits, a few 10a, and a few 32a. Hes replacing the 20a double pole breaker from the old water heater to a 3 phase 40a breaker, to suit the new heater. What is the formula/calculation to determine the...
  12. Marcus Vaughan

    80amp cut out, 63amp main switch....

    Hi all, I recently carried out an EICR on a two up two down terrace. The cut out out has a sticker on it saying 80 amp. The main switch of the consumer unit is rated at 63 amp. Cleared all the C2 faults but stuck with this. No - I didn't break the seals to check! I did, however, phone the...
  13. P

    New to the forum, 100a main switch problem

    Hi all, Just dropping in first time on this forum, currently in my last year at college studying electrical installation. I have a quick question for anyone who maybe able to help. I have installed a consumer unit today at a new house I have bought, modified the exsisting ring a added 2 new...
  14. A

    Converting split load CU to Main Switch (RCBOs)

    Hi folks, i have a 16 way British General CU which was configured as split load. I'm converting to all RCBOs which is fine apart from one small detail, i don't have a single neutral bar long enough. The earth bar is fine - plenty of ways for CPC doubled with RCBO functional earth. The neutral...
  15. nazyv

    Help with identifing main switch type. New to periodic testing

    Hello can anyone please help as im new to this but always researching to better my knowledge. Im trying to identify the BS info for the msin switch. I know the fuses are BS 3036. Any help would be appreciated. Thanks
  16. Soulsurfer

    Main switch in CU 60947-3 or 61439-3 ?

    Hey all before I try looking next visit to one of the sites I'm working at present, anyone know if DP main isolator for consumer units would be 61439-3 now or still 60947-3 ? Think 61439 is newer standard. Thanks
  17. P

    RCD being used as a main switch

    Is it against the regs to use and RCD as a main switch ? I have been told it is but Im struggling to see anything that confirms so. Im looking at 314.1 in the regs book but that doesn't say anything about an RCD being used as a main. Any feedback would be greatly appreciated.
  18. bigspark17

    Reg no for main switch on tnc-s

    Should main switch on tncs isolate all poles.? Switch in the pic only isolates the three phase conductors! Reg no?
  19. grumpyjohn01

    (Another!) Main switch tripping...

    Called out to elderly couple's house today - no power. All 3 lighting circuit breakers are tripped and mainswitch is off. Quick check reveals PIR lightswitch faulty and 1 lamp failed. Replaced the PIR switch for standard 1G2W switch and reset everything, seems fine now. Question is, how did...
  20. M

    CU Main Switch fault

    Hello all, I've got an unusual fault on a cu main switch in a Wylex split load board. I was called to a property with no power. The main switch was in the off position and both rcds and all breakers were in the on position. There was a leak on the toilet but no water through the electrics...

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