main switch

main switch

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  1. LewisM

    Axiom main switch compatibly (temporary)

    Hello, I hope you are well, a friend has lost power and it's the main switch that has failed I've got a bunch of different brands in the garage, does anyone know one which is compatible till Monday? Fairly modern one looks like Wylex style
  2. tidytech

    Consumer unit feeding another consumer unit via Main switch

    Can a domestic consumer unit feed another consumer unit, via the Main Switch. Details are: domestic property with 100A single phase supply, TN-C-S incoming supply to Main Switch on DBU1 Output from the DBU1 Main Switch, also outputs two two wires, that connect to the input of another consumer...
  3. R

    How to conduct safe isolation on this main switch ?

    Hi all, if I cannot access the line side of a crabtree 100A DP main switch. Would someone enlighten me how to conduct safe isolation on this installation. Would the main fuse need to be removed ? Thankyou.
  4. J

    Wiring an MCB beetwen RCD and Main switch

    Good evening, I wondered how the MCB between RCD and the Main switch is wired while watching this video. Photo attached. I assume a busbar link is connected to the main switch and mcb. Do the line conductors and the busbar connected at the same terminal and then go to the RCDSs? Link to the...
  5. T

    Replacing MK Consumer Unit. Main switch position

    Hello mates. i have an MK CU to replace. As you may know, the main switch in MKs is on the left hand side. There's no way to replace the meter tails. Is there another manufacturer that has a left-hand main switch CU, or a flexible position option? Thanks muchly!
  6. cliffed

    Main switch & Rcbo’s

    Special location a Static caravan TT System, CU fitted Main Switch then RCBO’s any comments
  7. R

    Spd from main switch

    Hello all, i am fitting an Spd to an existing installation and looking through installation instructions and it has a diagram where the feed for an Spd located externally has come from the bottom of the main switch. Does not seem right to me. Just wondered what people’s thought were on this. I...
  8. C

    Hager 100A main switch replacement

    So just been out to replace a main switch that had burnt out, Sat afternoon so had to replace with a Wylex one that fitted no problem to at least give them power... Need to go back and replace the switch with a Hager one, its SB299U.. The only ones I seem to be able to find are SBN 290.. I...
  9. 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...
  10. I

    RCD or Main switch in garage board

    Hi this may be a simple answer to my question but I can't find the answer in the regs If im fitting a garage board from a consumer unit with RCD protection do I need to have RCD protection in the garage board? I'm guessing I don't need an RCD at the garage board but I can't find a definite...
  11. J

    Double pole or Single pole + Neutral for domestic extension supply?

    I've been carrying out quite a few domestic extension first fixes recently which involves providing a power supply installed from the properties mains. I have always just Henley blocked from the properties main consumer unit tails into a 63/80/100A BS-88 fuse Main switch board then from the...
  12. V

    Neutral Conductor Size - Main Switch to Neutral Bar

    Don't come across this very often - but I've had a CU delivered for a caravan job (not static btw), and it's been supplied with a neutral conductor from the main switch to the neutral bar! Definitely an oversight, but I've got plenty of singles cable in stock, so rather than send it back, I...
  13. N

    location of main switch in consumer unit

    hi there - i have a consumer unit where the main switch is located in the middle of the consumer unit. I usually see the main switch on either the right or the left and i wondered if it is acceptable from an EICR point of view having it in the middle ? I attach a picture Also i just wanted...
  14. eleanor jones

    Consumer unit left main switch ?

    Which consumer units have left main switch?
  15. Tronic

    Position of the Main switch debate.

    I have been having a discussion on site recently : In an industrial situation, in the main intake room which contains the metering equipment, there is a, 60947-3 switch fuse. This feeds a section board complete with MCCB's, which in turn feeds 10 sub boards dotted around the place. When...
  16. NICKYNUNN

    Main Switch twitch......

    Hi all. Is there any good reason why you shouldn't use an rcd as a main switch in a domestic installation thats tns/ tncs ?
  17. The apprentice

    300 mA RCD main switch agricultural (tripping)

    Hi there thank-you for taking the time to read this! I have a 300mA Rcd in a grain shed on a farm now every time I try reset it won’t stay on there are 3 phases that go into the main switch And it isolates all 3 bar the neutral so when wen everything is turned off mcb rcbo in the board it...
  18. F

    Where is reg for singular main switch

    Hope some more knowledgeable member can educate me as to where in the BS7671 regs demands that every installation has a singular "Main Switch" if suppling 2 CUs on the same domestic meter board. (Does the internal Main Switch in each CU meet reg 537.1.3? TIA
  19. SJD

    Code for main switch replaced with RCD

    On a test & inspection today, I came across an older Wylex split load board that had been modified to add RCD protection for all circuits (see photo). The main switch was replaced with an RCD (despite there being room to add the second RCD to the left of the main switch). So a fault (or RCD...
  20. M

    Adding a portable petrol backup generator to the main switch board.

    Hi, I want to add a change over switch so that a portable backup petrol generator can be used when grid power goes down. As it has in Victoria. On referring to AS/NZS 3010:2017 to connect a portable generator. Figure 4.3 on page 57 shows a 1 pole Circuit Breaker in the active wire between the...

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