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cpc

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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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?
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. 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...
  13. D

    Mains distribution upgrade work, 3 phase,old isolators, steel conduit & trunking providing CPC

    Hello everyone I'm picking up some remedial works from an EICR fail in a commercial property. Its a 3 phase supply with old steel conduits , trunking & coupled metal equipment, that provides the earth to the various locations. At present the earthing is insufficient, every earth in the...
  14. Michaelwgroves

    Using adiabatic equation for CPC on SWA

    I want to use the armour as my CPC but need to check it complies. The cable will be run from a SP Distribution panel to CU. As per Selection and Erection Guidance Note 1 table D10a I can see a 10mm XLPE SWA requires a 31.1mm csa to comply, but only has 26mm on 2-core. 20171231_114229828_iOS.jpg...
  15. J

    tapping into conduit wiring with no singles cpc

    Afternoon guys Got a job my builder wants me to do in nice block of flats up town solid concrete ceilings/walls/floors unfortunately! lighting is just staying as is- but them want extra sockets added and a new 5amp socket circuit for lights the existing sockets are wired in single in tube in...
  16. O

    No CPC on lighting circuit ............

    OK, lets have a decent discussion about this as I'm sure there will be a number of opinions! Have done an EICR on a 40 + year old flat. The lighting circuit is wired in singles and utilises the steel conduit as the CPC. Out of the 6 lights and using my R2 wander lead, only 2 have an acceptable...
  17. T

    No cpc to lighting circuit, no rcd protection 50 year old wiring

    Hi just thought I'd throw this out here for a bit of light entertainment after the @Marvo thread (phew!) So brother in law asked me to look at EICR which returned unsatisfactory. I have not looked at the installation to ascertain as to Class 1 or 2 fittings in the premises are installed. The...
  18. S

    CPC size of SWA Armouring

    Evening, Just joined upto this forum after a search online for some info, hopefully someone can help me? I have taken over a job from another contractor who has run in a 50mm 4 core swa from a substation to a TP&N DB roughly 100m away. My concern is that it appears they have not run a separate...
  19. D

    Metal Light Switch + Plastic Back Box with no earth terminal

    I've tried to find a solution on here to this exact scenario but had no such luck. Could somebody please advise on where I should place the earth wire on a plastic back box with no earth terminal when adding a new metal face plate? The face plate has an earth terminal on it and was probably...
  20. T

    Adding to existing lighting with no CPC

    Hi everyone, I am currently installing an additional 4 way CU which is to serve a new extension on the customers house. They have also asked me to alter one of their existing 2 way stairs lighting so that they can have an intermediate switch incorporated (a switch at either end of the upstairs...

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