ring main

  1. D

    Ring Main Screeded in floor

    Can someone please advise me on the best way to terminate cables that are screeded into a floor ? A socket's being removed as part of a wall removal and the cables are screeded into the floor so can't simply be pulled back. Any advice greatfully accepted.
  2. B

    Too large a ring main

    I recently tested a new build (mostly new build) and found 45 sockets on a large ring main in an office environment. My r1 was 1.6 ohms rn 1.6 ohms and r2 was 2.7 ohms which made my r1+r2 1 ohm roughly my zs on the circuit was also 1 ohm although I didn't test all of them. the protective...
  3. B

    Ring main size

    Does anyone know the maximum size ring main in an office I'm don't meters I mean r1 + r2 size The ring I have tested has a r1 and rn of both 1.6 and the r2 is 2.4 does this comply?? anyone know
  4. T

    Spur to an outdoor light, from a ring main

    Can I wire a outdoor light that is connected to the exterior wall, from a ring main, via a fused connection unit, is this to the 17th edition. Thanks
    • tomma
    • Thread
    • light main outdoor ring ring main spur
    • Replies: 15
    • Forum: UK Electrical Forum
  5. R

    Lighting circuit taken off ring main somewhere

    evening guys, ive come across lighting in one room of domestic premises that has been supplied from the ring main at some point. the cable coming from the ring is 1,5mm which goes through the switch then on to the 2 x 12V down lights. This is on an EICR I`m doing. There is no chance at all of...
    • Ross1
    • Thread
    • being cable circuit david lighting lighting circuit main point ring ring main somewhere taken under
    • Replies: 67
    • Forum: UK Electrical Forum
  6. I

    adding of multiple sockets to different rooms on ring main

    hi guys need some advice as to which seems the best way to go. have a customer wants 4 sockets and a shaver point (via 3amp switched fuse spur) adding to existing ring main. Each new socket is located in a seperate room of the bungalowe (spread evenly accross the ring). No current rcd...
    • ianphilip007
    • Thread
    • adding break cable different enclosure main multiple ring ring main rooms socket sockets where
    • Replies: 9
    • Forum: UK Electrical Forum
  7. S

    Ring main question

    Guys, looking for a little advice from someone with more experience regarding wiring this ring main. I am re-wiring a full house, which has a new extension built onto the back of it. The extension has two rooms, a Livingston and bedroom. So, I have wired the old part of the house in 2.5mm for...
  8. N

    Lighting on ring main...

    Hi all, I changed a light pendant at a friends house and found his lighting circuit in the extension (2 lights) is wired off the ring main!! I have looked everywhere and cannot find a FCU, so can only assume it is in a junction box under the floor! Carpets have recently been fitted so bit of...
    • Newbie90
    • Thread
    • lighting main ring ring main
    • Replies: 14
    • Forum: UK Electrical Forum
  9. N

    Cooker on ring main....

    Hi all, A friend of mine is looking at replacing his existing built in oven (not cooker as stated in title :D) with a new one. The existing one is on a plug top and is connected to a standard single 13a socket on the house ring main. There is no isolator either. The new one is 3.5 kW. The...
  10. C

    Fusebox being fed by a ring main

    Hi guys turned up to a residential property today to add a few double socket outlets only to find the fuse box in the area was being fed by a ring main on the main switch. Is this allowed ?
  11. S

    Ring main design calc

    Going through a ring main design calc for a course I’m on to determine c.s.a of ring final conductors. As we don’t know the load current for circuit we assume this to be the rating of the overcurrent protection device. I.e 32a. Only correction factor I need is grouping factor which is 0.45. 32 /...
  12. T

    Wiring a double socket spur from a ring main socket

    Hi all, I am new to this site and would firstly like to say hello :) I am planning on wiring a double socket from a ring main socket (has 2 x live/neutral/earth) My question however is what size wire should I be using; 2.5mm squared or 4.0mm squared? The length of wire will be approx 0.5m as...
    • tommatt90
    • Thread
    • circuit double electrician first main ring ring main socket spur wiring
    • Replies: 21
    • Forum: UK Electrical Forum
  13. dez0178

    Can anyone explain the best way to fault find on a ring main.

    Hi, Can anyone help please. I am doing an assignment for college level 3. I am trying too understand how to find a fault on a ring main circuit. I have read about splitting the ring, finding which end has the fault test again until the fault is found. But could anyone explain step by step on how...
  14. C

    Max floor area of a ring main?

    I always thought that you were allowed "unlimited socket outlets within 100m Sq." I got told today that if the floor area was above 75m Sq it required an addittonal ring and this was the "new Regs" . Is this correct?
  15. M

    Volt drop from radial spurred from ring main.

    I'm installing a gate supply at the end of a customers garden. My plan is to spur off internal ring main and run a radial roughly 100m to end of garden. Providing the long run cable is of adequate size to sustain 230v to the end of the garden am I right in thinking that I can tee off again at...
  16. E

    Ring main

    Testing a consumer unit with horizontal trunking above it. On investigation trunking has been used to extend the cables into CU. The cables are block connected in the trunking to extend them. Testing the ring continuity, r1, end to end I discover a dead short. 2 legs leave CU to be...
  17. F

    Calculating Voltage Drop on a Ring main

    Hi Guys, I'm fairly new to the industry and have sat and passed all the relevant exams to become a Domestic installer. I'm a little stuck with one of my pieces to be assessed by NICEIC. I'm doing a full rewire at my dads house and would like to check that I'm calculating the cable volt drop...
    • fire8789
    • Thread
    • calculating correct length main please ring ring main voltage voltage drop volts
    • Replies: 9
    • Forum: UK Electrical Forum
  18. Clark3169

    No earth on ring main.

    Hi guys I am re-wiring a bathroom. I have done first fix for fan, down-lights and switches on the lighting circuit. I had to pick an earth up from some old conduit and will of course test this for continuity. Now when I have taken a front plate off of a single socket I have found there to be no...
  19. D

    One ring main covering a brand new 3 bed house

    Today my sister moved into a brand new 3 bed property. I looked at the distribution board and found that it had one ring main serving the kitchen, GF and 1st floor protected by a 32 amp mcb and a 80A 30mA RCD. I know that you can theoretically have unlimited sockets on a circuit but is this...
  20. G

    Ring main spurs and replacement of lighting fittings

    Hello, i am new to the electrical world and have been asked to add a few extra sockets in a house, and also fit a new exterior light where there is already and old and broken one. What are the regulations involved with doing this? its an old 16th edition fuse board with no RCD's just a main...

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