cpc

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  1. Q

    How to test a circuits in steel conduit as the cpc

    Good evening I am currently a training to become an electrician. I do hold both initial verification and periodic testing qualifications however this is an issue I have never personally had to deal with and was never mentioned on any of my courses as often seems to be the case. Basically I am...
  2. cliffed

    Eicr no cpc continuity

    Remedials On Eicr,no cpc continuity,checked all sockets,still no luck. Gotta be a junction box,but near impossible to know where. Any ideas
  3. J

    CPC Terminal in plastic surface mounted back boxes...

    Hoping someone can help me clarify something. For plastic surface mounted back boxes, why do some have a small metal terminal for connecting the CPC, whereas others don't? Is it just a differemce in quality, or would you generally use the ones with the terminal for sockets, and the ones without...
  4. W

    Vintage Lamp CPC suggestions please

    Hi - been to fix a lamp today with a loose connection in the lovely terminal blocks. Then I noticed there's a brass lamp holder with no earth terminal and the earth is cut back in the wall. There's 4 of these fittings (8 lamps) in the room and they're probably all the same. Any suggestions for a...
    • Wilko
    • Thread
    • cpc lamp please suggestions vintage
    • Replies: 7
    • Forum: Lighting Forum
  5. Adam_92

    1.5mm2 fp200 cpc size?

    probably a daft question to most of you, but in an 1.5mm fp200 is the cpc the same size or is it 1mm because my supervisor has told me it is the same as t&e but I’m pretty sure it is the same size :/ I’m trying to find it in the on-site guide.. Thanks Adam.
  6. D

    Bathroom downlight insulation coverable + exisiting CPC cut

    Pleased to find this forum, my 1st post! I will get an electrician in for this to make sure it's safe and tested but I want to understand what's right before getting a quote/posting a job. Previous owners had downlights installed in the bathroom but a later test certificate identified the CPCs...
  7. C

    Adiabatic Equation - why only for CPC?

    Why adiabatic equation is used only for sizing of CPC? Why not for phase conductors too?; As the fault current also flows through the phase conductors
  8. C

    Calculating the correct cpc size

    Good evening all, Some help with following would be much appreciated. A 20 Amp rcbo in a CU supplies an adaptable box on the outside wall of a house via 2.5mm2 T & E. From the adapatable box a short lenght of SWA supplies a couple of sockets and light in a shed. My question is does the 1.5mm2...
  9. happysteve

    Low IR to earth (with no CPC)

    Here's an interesting one... :) Amongst other things, was asked to replace a 1G exterior socket with a 2G. Did some basic checks before I started, including IR (L+N to E) on the RCBO-protected socket RFC. ~0.26MΩ, uh oh. Sigh theatrically, ponders a day of unplugging everything then splitting...
  10. A

    Double insulated down lights cpc

    whats classes as the correct method of terminating an earth cable when you have double insulated fittings? You can see on the picture I can’t get a wage inside nor a normal connector block it’s just too tight. I have seen in the past the cpc being bent over and also snipped off which isn’t...
  11. HappyHippyDad

    Understanding minimum CPC requirements?

    My assessor said that the minimum CSA for a Main earthing conductor for a TT was 16mm. I questioned this as I thought it was 4mm. Regulation 542.3.1 states every earthing conductor shall comply with section 543. Section 543 refers mainly to the adiabatic (reg 543.1.3) or reg 543.1.4 (table...
  12. M

    Plastic Light fitting with metal trim & no CPC

    I have a couple of lights on a circuit that does not have a CPC. The light fittings are plastic but they have a metal trim that screws into the plastic body. I wonder if anyone can advise me if these are deemed as safe considering the main body of the light fitting is plastic and the metal trim...
  13. K

    Using cpc as neutral

    is it dangerous to use the cpc in a twin / earth cable? I know it's not safe in case someone else thinks it's still an earth but is that the only reason?
  14. J

    Code 3 for usign Sheath of MICC as CPC

    This has probably come up before but I cant seem to find it. I have been presented with an EICR produced by another company where they have put a code 3 down for using the sheath of mineral insulated cables as the CPC. No further explanation on the observations and recomendations sheet. No...
  15. captaincaveman

    neutral live and cpc used as neutral

    Damn this heat. I just can't think straight! Been called to an installation where the ceiling was sparking near a light. All the lights were working ok. The spark was coming from a loose earth wire from the light fitting which was touching a metal ceiling frame. I checked the light switches and...
  16. J

    10mm t&e submain cpc

    I know there’s the adiabatic equation to work earth size but generally if you install a twin and earth cable for distribution, do you need to worry about the smaller cpc size My situation is 20 metre 10mm t and e run and not using it to provide earth bonding. Will the 4mm cpc be adequate. 50A...
  17. M

    No cpc on lighting and no neutral continuity on kitchen ring

    Hi All, I recently replaced an old rewirable fuse board for metal split load rcd board. However on testing prior to replacement I noted that one of the lighting circuits doesn’t have a cpc. I’ve put this in the EIC for the new board that no cpc for lights, advised client that needs rewiring and...
  18. dnjr

    Swa as cpc what size ?

    Dear all Testing a garage that is fed in 2 core swa using the swa as cpc Live and neutral are 2.5mm. I know the swa is fine as a cpc but I’m unsure what size to put on certificate for it Seen a table that says it’s equivalent to 17mm but in the back of my mind I remember you need to divide by...
  19. S

    CPC used as interconnect on smoke detectors

    We all know this is wrong and breaches regulations and manufacturers instructions. Good tread on this: https://talk.electriciansforums.co.uk/topic/23387-cpc-as-interlink-on-smoke-alarm-circuitwhat-would-you-do/ However the question is does it warrant a C2 over C3? My recommendation is going to...
  20. snipersmith87

    SWA cables - fly leading armour as cpc??

    Just after A bit of advice regarding a load of swa cables into dist board. What's people's preferred methods / good practice regarding banjos fly leads etc. Banjos inside?? If multiple cables are using armour as cpc is it considered bad practice to use 1 fly lead between the two Banjos??? Is it...

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