cpc

  1. bigspark17

    Using old 2.5mm t&e with 1mm cpc

    Can i add additional sockets off a cirvuit that uses 1mm cpc within a 2.5t&e cable please? Or can i use it to feed a switch spur then 2 x sockets?
  2. D

    50v on CPC on front plate.

    So, I'm stuck. There is a metal light switch, which has a noticeable vibration to it when you touch. Like a humming on your finger. It is a 2 way at the bottom of the stairs. The 50V is only present when the lights are switched on. I tried changing the switch, no effect. I haven't a clue...
  3. N

    Ferrule for triple solid core CPC in socket w/metal back box

    Ancillary to my other post, I wanted to check if something was up to standard in part of the installation I'm doing. We have a metal back box in this case. I've got a fly lead going to the face plate, which has the two other CPC cables going to it also. I've not been happy with how sturdy the...
  4. A

    Marginally high CPC end to end readings

    Sure this has come up before but yesterday testing after adding a spur and end to end readings on CPC come out about 0.2ohm over expected reading (was expecting about 1ohm from LL & NN (0.65) Checked all sockets I could see (some were very old so suspect the sockets themselves might be a...
  5. R

    25mm swa armour for cpc

    Hi all, Just planning a sub main to an outbuilding . It will be 80 metre run, buried direct on a 63amp fuse . So I am thinking of running 25mm swa but just been doing my calcs on whether I can use armour as Cpc. The outbuilding is going to be TT so no need of a bonding conductor on the...
  6. J

    What am I looking at? Steel CPC?

    Hi all, This is found behind a single socket, house probably wired 1970. Can you tell me about the steel wire earth? Why does this differ to the copper cpc throughout the house? Thanks
  7. M

    EICR Code - Socket Radial - No CPC

    Hi guys Completed an EICR yesterday. One of the Sockets Radials had no CPC so R1+R2 plus Zs could not be not be completed. Does anyone know the Regulation supporting this Code 1/2? I can see 411.3.1.1 but this relates to Lighting. If anyone could assist Id appreciate it, I know its a fault but...
  8. cliffed

    Cpc no continuity on pendants

    EICR picked up no continuity on cpc on 3 pendants fittings in a grd Floor Flat. Zs measured @ other pendants & complies. Different opinions on the coding personally a C2 for me..but others are saying C3 mainly because of the code guidance in code breakers. I think this statement relates to no...
  9. Marvo

    Flat twin cable with sheathed CPC.

    I see they're introducing a new type of flat twin cable with a sheathed CPC. In my location there's no requirement to sleeve CPC/bonding conductors and you never see it done. We just install and arrange wiring in enclosures or DB's in such a way that there's no realistic chance of the...
  10. S

    UK Amtech/Trimble - Excessive Earth Loop Impedance on SWA cables

    Hi All, I'm new to Amtech/Trimble and I've been asked to review a model. I'm looking at circuits that are SWA cables using the armour and an internal conductor as the CPC. There are various earth loop impedance errors listed where the Zs at the load end is too high, but what I can tell, Amtech...
    • Steve W
    • Thread
    • cables cpc earth earth fault loop impedance impedance loop loop impedance swa
    • Replies: 4
    • Forum: UK Electrical Forum
  11. S

    UK TNCS CPC not used

    Hi All, As mentioned, I’ve got what looks like a TNCS system but CPC is coming via an earth rod???? Not tested TNCS system yet to see if earthing is acceptable
  12. 2

    16mm T&E cable on distrubution circuits - The 6mm CPCs are a limiting factor no?

    Hello all, I wonder if I can get some opinion on my deliberations on an old TPN installation with numerous 1P sub-boards wired up with 16mm T&E cables from a TPN distribution board. It's getting well beyond it's time for the wiring but the client (commercial) needs to eek things out for...
  13. W

    CPC break - share another?

    Hi! DIYer here. I have an MCB running to a cooker isolator switch. The RCD connected to this set of MCBs is tripping and isolating the cooker MCB is the only way to stop it. So, clearly a fault on this line. I‘ve disconnected the cooker and the same fault exists. I’ve tested the cable for...
  14. Antares

    Dead test circuit with 2 cpc

    Hello everyone, I saw in the hospital every circuit has 2 separate cpc, same size, sometimes different. I'm wondering. How we can do the dead test in this case? R1+R2 whith 2 cpc combine, but IR test 2 cpc separate? what result will be sign in test sheets?What in case if there are 2 different...
  15. F

    SWA and separate conductor as CPC

    Evening all, Having a debate with a colleague about using the SWA armouring and a separate conductor both as CPC's for a circuit. So in theory bringing down the Zs of a circuit due to using both as CPC's. I'm swaying to thinking this is wrong however, I'm struggling to find any regs to express...
  16. P

    No CPC at light switches in plastic trunking

    Not the usual per-1966 sort of "no CPC in wiring issue" but plastic light switches in plastic back-boxes in trunking wired in singles. The lights have CPCs and measured Zs, RCBO trip-time, etc, all good. However, the actual switches lack a CPC. Now I could run in a CPC to meet the last...
    • pc1966
    • Thread
    • cpc light no cpc plastic plastic trunking switches trunking
    • Replies: 3
    • Forum: UK Electrical Forum
  17. HappyHippyDad

    Solution to a C2 - No CPC on lighting circuit

    I've tried to research and form a plan without asking on here, but I'm just going around in circles. Just completed an EICR. The wiring ranges from new metric colours to old imperial cable. There are 2 lighting circuits, both containing class 1 fittings. Most of the fittings have a CPC, but...
  18. P

    Using conduit as a CPC

    A recent discussion on conduit choice wandered over to pros and cons of the 'conlok' style and a link was posted to one of the Efixx videos in this post: https://www.electriciansforums.net/threads/which-conduit-holders-for-metal-conduit.206954/page-4#post-1821665 The related video showing them...
  19. J

    SWA as cpc to submain-Suitability, & PC's on RCD's.

    Been looking at a CU change in a small office and would appreciate comments on the following. Office is supplied from the mains intake in the warehouse via a 2 core 16mm SWA buried under concrete with the SWA used as cpc (60A BS88 is the protection). Mains intake in the warehouse is a 3 phase...
  20. archee

    2.5mm2 on with CPC cut off to 32amp mcb Is this normal ?

    Hi, A question to all the sparkles out there who could explain this mess to me please. Bought a house built in 2000’s found this 2.5mm2 cable running to loft for radial sockets via FSU ( they had 3 amp fuse in there lol ) connected to mcb 32a as you can see for some reason they decided...
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