ring main | Page 6

ring main

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  1. N

    fused spur of a fused spur from ring main

    Hi guys, whats the regs regarding fused spurs? Is it ok to have, from the ring main, a fcu, feeding another fcu, feeding another fcu etc or is it only one fcu per socket like a normal spur? I've got a fcu spur from the ring main for a fan in the bathroom. I need to fit in an electric...
  2. E

    No power to section of ring main.

    Hi all, I'm a newbie to site so please be gentle with me on this query! I attended a house recently to repair a damaged socket/back box on an upstairs ring main. However after isolating and repairing the socket in the bedroom concerned, the householder said that none of the sockets had worked in...
  3. T

    ring main a mess

    Hi guys been re -wiring a consumer unit which ive done and had a look behind sockets and ring main looks a mess seems to be spurs off spurs off spurs in some rooms anyone know what the best way forward is? Just put on 20amp breaker , i cant split in board and put on two 20amp mcbs can as they...
  4. R

    One ring main for whole house

    I have just bought a relatively new house (15 years old) and didn't expect to do any major electrical work only moving the odd socket. however i went to isolate a socket and realised the whole house was fed off a single ring on 32amp.(still cant believe it was wired like that!) I'm will be...
  5. L

    why a boiler on a ring main?

    I need this clarifyiing for a college exam(actually part of a plumbing course and why teachers cannot answer this) why can a boiler run off a ring main and not for example, a cooker or immersion.. they tell us that everything else needs a radial circuit, but why is a boiler so special?
  6. Pete999

    H.V. Ring Main

    I have been looking through all of my paperwork, something to do now I'm retired, and an interesting question came to mind regarding H.V. Ring Mains. I appreciate not every one would have worked on one but for those who have here is the question, When I was involved we always operated an open...
  7. S

    problen with ring main

    I have posted this before put dose not seem to of posted so sorry if is a repost I have added a few socket outlets to my ring main everything is working fine but for some reason when I have tested every socket with a socket tester some outlets read that L and N are swaped over only on a few...
  8. B

    Ring main Figure of 8.....

    Hi there wonder if anyone can help..... ive tested continuity on a new ring main circuit I installed the end to end were - R1:0.28 Rn:0.28 R2:0.40 seems ok The figure of 8 results I expect from that would be L/N = 0.14 & L/E = 0.17 roughly Although on some of the sockets the figure of 8...
  9. a-z electrics

    3 legged ring main

    Some advice please.. I am going to replace a 1361 fusebox, only 5 circuits, with a new consumer unit. However I have noticed that the ring 30A circuit is still energised after I pulled the circuit fuse. Further investigation revealed another 16A cct is connected and only once this fuse is pulled...
  10. A

    2.5mm2 ring main protected by 20amp breakers

    So an old colleague of mine stipulates that ring main should be protected by 20 amp breakers. Why you ask? Well he said because a piece of 2.5mm2 can only take circa 26 amps and if the ring main broke at any point it would effectively make it two radials, and it would be protected by a 32 amp...
  11. S

    Ring Main fault

    Had a call this Morning that her rcd keeps tripping. So i went round there First of all unplugged everything still tripping. Done a few tests L-E N-E L-N and end to end test all came back as 0 mohms. So i Separated the legs at both the board and the sockets found the fault leg. Reconnected...
  12. D

    Insulation Resistence on ring main

    Hi Guys, I am absolutely baffled at the moment as to why i cannot get the correct reading for insulation resistence when Im testing the line/neutral on the ring main. I have made sure everything is unplugged, disconnected the neutral from the bar and allgator clipped to my test lead. When I...
  13. D

    Fault on ring main

    My in laws recently returned from holiday to find that their downstairs ring main was off.when I looked the mcb for this circuit was in the odd position and on trying to switch on it tripped the main rcd switch for this set of circuits.after first unplugging any appliances and this not resolving...
  14. M

    Ring Main fed via Contactor

    I have a 13amp spur, fed by a 2.5mm cable, protected by a 16amp RCBO , supplying a contactor, which in turn has a ring main coming off it; this has roughly 30 sockets on it, for an IT suite. This is the the first time I have seen a Ring main wired like this; Is this up to regs and if so what...
  15. R

    Ring main IR question from todays EICR

    Hi All, While carrying out a commercial EICR today, I was doing IR testing on one of the ring mains an was getting 0.00M ohms between L/N - and the earth bar at 250V & 500V (cant distinguish what 2 earth wires belongs to the other 4 cores) I have continuity on both L & N legs which are...
  16. C

    rcd to ring main commercial building (offices) dado trunking

    taking some trunking off the walls and fitting dado trunking and adding few extra sockets in. Does this require the circuit to be rcd protected. the circuit is protected by a 32amp mcb . all sockets in dado.
  17. E

    Extending Ring Main

    Guy's can you confirm that if I extend an existing ring main for (one socket) the existing circuit has no RCD protection I can do so without adding RCD protection
  18. Mark.W

    Ring main help

    Hi I was wondering if someone could give me some guidance on a ring main please? The ring consists of 21 CCTV columns drawing 5A each. The total length of the ring will be 1600m. Is there a calculation I can use to calculate correct cable size and breaker rating? Many Thanks Mark
  19. D

    Ring Main R1+R2

    Hi, Just a quick question, Ring Main, ive done end to end on the neutral and line conductor, cant do end to end of the CPC due to the Steel Conduit being used as the CPC, does this mean that i cant do a R1+R2 test due to being unable to do the figure 8? Thanks
  20. driverman

    Volt drop calcs on ring main

    Hi Guys, I'm not into design etc and never have been really but how do you calculate volt drop on a distribution ring main circuit? Ring circuit say covering a large area supplying various loads/buildings. I was thinking split the ring and work it out as 2 x radial circuits, but 1 radial may...

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