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  1. N

    RING MAIN CONFUSION

    Hi guys. Having a weird problem in a house that has suddenly happened. One half of the ring main has 240ish volts (fluctuates of course), and the other half is dropping to 210v - This is when I test L-N and L-E…. N-E shows nothing. Whenever I plug a table lamp in the the faulty side of the...
  2. K

    2 x Main Switches in on consumer unit

    I wondered if it is OK to have 2 x Main Switches in the same consumer unit. One feeding the RCBOs in the House and one feeding the CU in a garage, so that the outbuilding stuff can be isolated from the House CU?
  3. S

    Attic sockets in ring main uk

    Hi all I would like to put some sockets in the attic and keep them on the main house ring main. Am I right in saying I can pull one of the legs from the bedroom socket and create my ring of sockets and the last socket connect it back to the bedroom socket
  4. 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...
  5. C

    Help with spurs from ring main

    Good evening. Currently sorting out my girlfriend’s flat for rent. I’ve found all sorts of bad electrical work. Can anyone advise if this is an acceptable way of connecting 2 spurs to the ring main? It will all be connected in a double back box behind a blank plate on a wall using 32amp rated...
  6. I

    Is the main fuse big enough?

    Hello Shop with a 100A main fuse LED lights few amps max, cash tills, cash machine, roller shutter, auto door, nothing pulling much power but there are 5 motors totalling 80.5A FLA Realistically what sort of power would this site be pulling constantly? Slightly conecerned that it may be...
  7. L

    Very high Zs on ring main.

    What would be the fault with a very high Zs at all sockets on a ring main, the sockets are an average of 68.10 . The lights are.67 and the is a socket radial circuit which is at .51 .
  8. cliffed

    comply to Regs to install a MCB for the Sub Main to the 1st Floor DB

    Replacing DB’s with all singing all dancing RCBO’s Problem’s we have now…Existing installation consisted of DB Grd Floor.. DB 1st Floor…Grd Floor DB supplies 1st Floor DB…16mm T&E installed IN fabric of building. DB 1st Floor supplies Remote Garage Block 16mm T&E With the Sub Main to DB 1st...
  9. P

    UK Shared income supply main fuse

    Hello, my incoming supply has one main fuse that feeds the next door naghbour it leaves my house to go next door as shown in picture..it's the single cables going through the hoteCan this be split, and how would be responsible for any changes.Thanks Paul
  10. A

    Bus bar chamber with no main isolator

    Evening, I've been asked to install a supply to a sprinkler system in a new installation that must be separate to the building electrical services. I.e if you isolate the building to work on the electrical services then the supply to the sprinkler pumps must remain live. The only way I can see...
  11. BodgeJob

    Does a main protective bonding conductor require UV protection when run outside?

    Hi there, Just a quick question. Does a main protective bonding conductor require UV protection when run outside? I am under the impression that this is not a requirement as such, but if possible, it should be considered. Especially if installing a smaller sized conductor. I am running a main...
  12. M

    Changing main RCD AC-type to A-type

    Hi, I'm back in the electrical game after 9 years break so feeling a little rusty! I'm adding an additional socket to a circuit but the main RCD feeding all the circuits in the consumer unit is AC type. Based on this, I believe I have to change this to an A type which is fine but the question...
  13. N

    SUB MAIN QUESTIONS. ADVICE NEEDED

    Hi all. I have been asked to take over a job an electrician has started, and has moved abroad. The house is a big mansion, with a 3PH supply, with 100A fuse on each Phase. The electrician has ran 2 25mm 3core armours to another 2 DB’s in the mansion, and there has to be a DB fitted where the...
  14. ionionascu

    UK Seal wall holes with main cables

    Hi. I live in an older house and I have old white twin and earth cables going through walls in large white pipes. Unfortunately, some mice managed to squeeze through these pipes so I want to seal all the gaps. Can you please recommend a sealant that can be used for this? I read that fire rated...
  15. 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.
  16. G

    Moving a ring main socket further along a wall

    Hi all, I'm planning to remove a stud wall seperating my dining room and kitchen. On the dining room side of the stud wall, there is a double socket which I want to move about 2 feet approximately along, and onto the back wall. The wires will be coming down from the ceiling as they all do on...
  17. J

    C40 rcbo on ring main changes to b32 causing nuisance tripping

    Ring main was on a c40 rcbo so I tested the circuit everything was fine and dropped down onto a b32, It’s quite a long circuit but only serves about 10 sockets.The rcbo stays on but the client says trips frequently, I’ve been back and the rcbo stayed on the whole time, I then left and over the...
  18. L

    Anyone know more about these OLD BNO main isolators ?

    Ive mentioned it in another thread but thought I would make a specific post !! From a quick look its a "piston type " affair .The leaver lifts up and pulls out the rod in the middle .A bar has to be inserted to the rod that then allows the lever to roll upwards pulling etc . I'm old...
  19. D

    Adding to an existing ring main, but no spare ways in the C/Unit

    Hi guys I am looking to add 4 additional sockets for a room that is being converted for a bed ridden person. The room at present has no sockets in it, would it be possible to add to the existing ring main in the consumer unit (this is in the room). The load would be very minimal couple of...
  20. michaelw6

    Outside socket spurred from the ring main. query! (I am a long Serving electrician)

    Ok i may get slated for this one but here goes; A bit of background info first. Its been a while since ive looked at my iee regs, and ive not done my 18th edition but get the updates. i no longer practice much electrical due to a career change. But for friends, family old customers when i get...
    • michaelw6
    • Thread
    • electrician long main outside outside socket query ring ring main socket spurred
    • Replies: 12
    • Forum: UK Electrical Forum
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