main switch

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  1. B

    Blank before Main Switch

    Hi all just a question regarding a consumer unit that I noticed on a job while carrying out a light fitting change. Would this be acceptable. It’s a proteus consumer unit. The tails come In from the bottom of the consumer unit and bend up to the right HS of the surge protection and into the...
  2. Gavin John Hyde

    Old install 100mA RCD main switch but no 30mA

    Have to replace this old board for a elderly relative of my soon to be wife, British Gas have been along and used soem of the special triangle stickers to say it is unsafe - but still fitted the new boielr anyway with a FCU from the socket circuit in kitchen, as always money is the priority for...
  3. D

    Fused main switch - tails over 3m

    A quick question regarding tails and the 3m length. I need to move a consumer unit, however it will be around 5m from the DNO cutout. Is it acceptable to install a REC2 isolator at the meter cabinet, 3m tail length to an accessible position and then a fused main switch, followed by around 2m of...
  4. J

    MCB as a Main Switch in Garage Panel?

    Hello and thanks for checking this out. I have a garage with its own consumer unit and at this point I'm trying to get some feedback on the pros and cons whether its best to install a "double pole mcb" or "main switch" in the garage panel before going to the individual mcb's. so whats your...
  5. C

    RCD Main switch on TT system

    Hello everyone, Does an RCD as main switch in a TT system a must or not? My question is can you use an isolator and then RCDs for the rest of the distribution board? Thank you
  6. KeenPensioner

    Main switch position on CU

    As I've said many times I'm not an electrician but still learning at 73 years old. I watch a lot of YouTube videos on electrical topics, just for the sake of it. I've just watched a video by Artisan Electrics where he was fitting a new CU and had a problem when the length of the existing tails...
  7. mak

    Schneider board main switch TP-N and 4-pole

    What's the difference between the two, one isolates N the other does not, got me confused when I was testing continuity between E-N, then I realized N was not isolated.
    • mak
    • Thread
    • board isolate main main switch schneider switch switches
    • Replies: 8
    • Forum: UK Electrical Forum
  8. L

    RCBO Neutral Leads bunched with Main Neutral in Main switch - C3 or C2?

    Hi all, Engineer carried out EICR and marked the above as a C2, I agree, the smaller cables could come loose easily as the terminal is mainly clamping the 16mm tail. Client said C3....
  9. S

    Main switch to RCD cable

    I was putting additional sockets on a ring final circuit for a client - all done, pretty simple job. BUT!! When doing the testing, found the main switch and live feed to main RCD had serious overheating damage!! Needless to say needs replacing! All the circuits are in good condition. its an...
  10. L

    UK Are surge protection devices fitted before or after the main switch

    Are surge protection devices fitted before or after the main switch
    • L1Jay1
    • Thread
    • after before devices fitted main main switch protection surge surge protection switch
    • Replies: 30
    • Forum: UK Electrical Forum
  11. gazdkw82

    Linked main switch

    I'm just going through the schedule of inspections in preparation for my testing day tomorrow for my AM2. I'm stuck with "presence of a linked main switch" is that a switch that disconnects line and neutral? Or a switch that disconnects more than one pole? So, would a 3 pole (3 phase) isolator...
  12. polo1

    BS number MK 3 phase main switch

    Anyone advise the BS number of this main switch...
  13. spud1

    Overall main switch where the installtion has off peak heating ?

    What is everyone's general procedure for provision of an overall installation main switch isolator where an installation has two DB's - one off peak, one on peak? Is it crucial a linked 4 pole main switch be installed to isolate both sets of tails or can a dispensation be made with some clear...
  14. T

    Removed these from a mains change today

    Evening all Picked out these bad boys from a few board changes the other day. Not sure if they are worth keeping?
    • TJC1
    • Thread
    • change collection crabtree main switch mains removed these today
    • Replies: 2
    • Forum: UK Electrical Forum
  15. C

    What Cert got fitting main switch

    Hi I have been asked to fit a main switch / isolator by my client as they have no means of isolating the full installation by a single means. So I'm planing on fitting a Wylex isolator like the ones meter people fit but my question is what Cert should I be I fill out at the end a minor works or...
  16. Steve93

    4mm cable into the bottom of main switch.

    Eicr today had a 4mm T+E connected into the bottom of a main switch which went to a separate dB with 1 20amp rcbo. Then swa to a hot tub. That part is fine. What I’m unsure about is the reg I can say that the cables are not ok in the bottom of the main switch. The other dB is only about a ft...
  17. B

    Rating of CU main switch

    Hi all, I noticed on my consumer unit that the main switch is rated for 100Amps, however the total load of all the MCBs is over 150Amps! I appreciate that diversity COULD (?) be applied in that not every circuit would be simultaneously running at full capacity, but is the installation...
  18. T

    Selecting a 3 or 4 pole main switch

    Evening all Pricing up a consumer unit change in a large industrial unit When it comes to selecting a 3Pole main switch for a 24 way distribution board, are there any factors that will change the decision between a 125A 3pole or 4pole main switch?
  19. S

    CHINT RCD MAIN SWITCH MALFUNCTION AFTER TEST

    Installed a new radial circuit in a garage from an existing CHINT garage unit. All functioning well (tests fine) until after the RCD test. Then everything, lights etc stops working. On investigation, while I've got 244V at the incoming side of the main switch I'm getting a reading of...
  20. T

    Correct Lock Off Device for 4 Pole Main Switch

    Hi all & thanks in advance for any feedback. Could anyone tell me the correct Lock off device used to safely isolate a 4 pole main switch? I'm not 100% sure if the isolation device with the prongs is the correct device to be used or if another lock off device is necessary. Pics attached...

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