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  1. D

    Max Zs /ADS / shared CPC & N

    Hey Everyone. Whats your thoughts on using a 3core & earth to run x 2 final circuits? I have x1 three core & earth feeding contactors for emergency lighting. L1- fed from a 6A mcb is feeding a switched pole on a NO contactor, L2- fed from a different 6A mcb also feeding a pole on a NO...
  2. FatAlan

    Another..Replacing lost CPC?

    Ok, so there have been a number of threads on old lighting circuits with no CPC. Also noted that it’s a no no to borrow a route to earth from another circuit. In this scenario I have two lights atop of brick gate pillars. I have good continuity and sound IR between the two pillars along with a...
  3. B

    Broken CPC on Lighting Circuit

    First time posting so hope this is correct place? Been checking out a Customers Premises and all is good apart from 1 lighting circuit that feeds a bedroom and office. A CPC has been run but has been damaged/broken/cut somewhere en route to first light switch. (proved by using wander lead)...
  4. Sparky10

    Socket feeding DB

    Hi All, Visited a job today and was asked to supply and DB in a outbuilding via a Socket in the garden....:eek: i said i was not happy to do so and it wasn't possible. DB was suppose to feed 4 sockets 3 lights and a little plug in heater, Client claimed she was told by 3 previous electricians...
  5. HappyHippyDad

    Can I use the sheath of the SWA as the CPC in this example?

    Morning.. I have a garage fed by 4mm, 2 core SWA. It is a 25m run from the CU. Can I use the armour as the CPC? The Main house is TT. I have always used 3 core so have not come across this before. i am about to check my notes as I know I have information on this and will find the formula to...
  6. E

    Trunking CPC Continuity.

    Hi Guys, an old existing 25mm - TP & N SWA Supply cable is glanded (No Banjo) to a 3" Metal Trunking end cap, & the remainder of the circuit cables are contained in the same trunking forming the CPC back to the Distribution Board. With a method 2 continuity & an insulation test, can you be...
  7. D

    Volt reading across N and cpc

    I'm in a vineyard. There is a 300m buried SWA from the ccu direct to a 2 gang socket. I'm getting 247V across N and L at the ccu.... But at the socket I'm getting 100V across E and N and 147 across L and N. Continuity as a radial tested ok IR All over 500 M Please list possible issues here...
  8. B

    Testing pyro 2L2.5 cpc size

    When testing 2L2.5 & 2L4 pyro what size should be recorded for the cpc when using the outer sheath?
  9. Z

    Steel conduit used as CPC in flat, can’t find bonding, can’t find ring main CPC at C.U

    I’ve been asked to add a couple of extra points to the single ring main in a flat. Building fabric is concrete, all of the electrical installation is steel conduit buried in the concrete. I opened the consumer unit and could only see one CPC for a radial socket, as well as the main Earth. No...
  10. Simon-0116

    Moving db with no cpc in lighting

    Replaced a db on a tt system, but moved it about 1m. All circuits were required on rcbo. So I've extended cables. Now one lighting circuit has no earth. Obliviousy I know existing it's ok to have no earth if class 2 fittings, relevant sticker notices in place. BUT because I've worked on...
  11. Z

    Question regarding signing off 32a ring circuit with broken CPC ring continuity

    I installed a kitchen ring recently. Went back to test after the builders had finished and found that the CPC is broken somewhere inaccessible, everything else tests normal. I’ve got continuity on live conductors, and even with the broken CPC, each socket is connected to the CPC and tests with...
  12. S

    NO cpc lighting 18th edition

    Went to fit new light fittings in a loft conversion today. The existing ceramic half moon uplights were installed using 2 core flex buried in the plaster going I know not where! I've come across 2 core systems in old peabody trust estates that where complient as long as double insulated fittings...
  13. 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...
  14. 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
  15. 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...
  16. Wilko

    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...
  17. 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.
  18. 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...
  19. 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
  20. 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...

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