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cpc

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  1. A

    Sharing a CPC

    Hello all, I have been ask to run power to a couple of AC units in armoured cable clipped along the outside of a new building. It is going to require 2 separate 20amp circuits so was wondering whether I could run a 4 core armoured cable, giving me 2 lives and 2 neutrals then using the armour as...
  2. rustynails

    no cpc customer wants metal fittings etc....

    This has been posted about a lot but I wanted to ask a really stupid question. I can only run 4mm single g/y to each metal fitting from the board which is dual rcd 30ma. I cannot touch the drops, stipulated by the landlord. Is it acceptable to issue a mwc for this, write a safety letter and...
  3. W

    Help required on separate or non separate CPC for 200A 3P supply

    Hi guys, Im banging my head off the wall on this one. I have to run in a new 200A per phase supply. The cable length is 35M. Ambient temp is 20C. I am looking at table 4D4A in BGB and as it's to be on tray so Im thinking a 70mm CSA 4core as it has a Current carrying capacity of 207A (I am...
  4. N

    Sizing of CPC and bonding conductor

    Hi Guys I have been asked to quote to install a MET for a TN-C-S system and I could do with some advice please I can't get into determine the size of the conductors as I cant switch the power off to open up the main panel What I did was measure the circumference of the SWA it was 214mmm I...
  5. Midwest

    Voltage on CPC

    Went to a job the other day, where the client wanted a light fitting put up instead of the ceiling rose. In conversation they mentioned having problems with their electrics, and had had a new CU fitted. I decide to measure ZS & RCD at the said ceiling rose. However, my tester (Megger1730)...
  6. N

    T&E CPC Estimated 12% Undersize...?

    Testing 2.5+1.5 socket ring, got r1 0.75ohm, rn 0.76ohm, r2 1.38ohm. Expected r2 is 1.25ohm (=0.75*2.5/1.5)...bit of a deviation. All CPC connections inspected appeared fine. Had a micrometer to hand (not calibrated admittedly) so measured conductors, live = 1.77mm dia, CPC=1.30mm which gives...
  7. P

    recorded cpc size

    on a schedule of circuit details for a installation certificate, under the circuit conductors cpc size in mm², what should be recorded when a SWA cable has been used but one of the inner conductors is used as the cpc (say single phase circuit supplied by 2.5mm² 3 core, 1 x phase, 1 x neutral, 1...
  8. uksparks

    Using CPC as live conductor.... ok i know, but...

    Hi, Had to change a bathroom fan at the weekend for someone and they wanted it to be on a timer, but couldnt as the cable was buried in the wall and wouldn't move etc.. the cable that fed it was a three core flex, I the earth was not being used anyway due to the load on the end etc. I know...
  9. jibjob

    What size your CPC

    Hi Guys, I have been asked to install a some lighting & sockets in a lean too come garage come workshop type of thing. I was going to do it in PVC conduit & make a proper job of it rather than surface clip T&E all over the place. I haven't done much in the way of circuit installation using this...
  10. S

    bizzare Line to CPC fault on lighting circuit

    Hi people Maybe somone can give me some pointers, Generally with faults i'm pretty good but this one has got me stumped! I was working in an old house that the owner required some modernising, so we did a kitchen and moved and added few lights and switches around as you do. The board was an old...
  11. M

    Lighting CPC

    Excuse what may be an obvious question here fellas, so I apologise, but I'm having a real brain fade after a bit of a trying couple of weeks at work (other work, not 'here')......A customer has requested that I install 3 x 12v downlight fittings to a small ensuite. My question is that as that...
  12. B

    conduit used as cpc

    Hi all again I'm doing another condition report for a property, no cpc for sockets, cooker lighting, what's the best way to test continuity, I'm thinking of doing the same way as R1+ R2 line to earth terminal, also would you record results in r2 box or R1+ R2 box, I'm having a bad day
  13. NDG Elecs

    Link between N - CPC on fluorescent... what is it?

    Hello folks, I hope the picture shows ok. If it does not show, then basically there is a blue disc approx 25mm in diameter that may have a resistor or something in it. It is approx 4mm ' thick'. The blue disc is linking between neutral and earth on the fitting. Never noticed these before...
  14. spud1

    Voltage on a CPC?

    Hi everyone, Hopefully someone can help me with this?! I am in the throws of finishing a domestic rewire in an empty house this week and yesterday was re-sleeving some CPC's in pendant light fitting that my apprentice had sleeved poorly. Rather naughtily I was doing this while the pendant was...
  15. L

    no cpc / earth connection available on lights

    and here's how it was overcome................... this was found AFTER rewire when the ceiling was dropped....................no certificates funnily enough!
  16. M

    Seperate CPC out to garage - duct or not to duct?

    Hello there. I'm forever looking over these forums looking for advice, and typically I always find an answer, except it seems in this one instance - which is what brings me on my merry way to here today. I was thinking of running a new supply to the garage. Problem is it has a water pipe (only...
  17. W

    swa and seperate cpc problem

    Is it a requirement of 17th edition to run a seperate Cpc with a 4core 3phase supply ? ?
  18. D

    connections of cpc

    hi, Testing a job at the moment and a couple of DB have all there CPC connected in the trunking instead of the DB. There is a earh bar within the metal trunking but due to the trunking full of cables, unabale to gain access to the CPC. Due poor access to the CPC ive made a report on that but...
  19. M

    RCD operation with no lighting circuit cpc

    Can someone tell me if an RCD or RCBO, 30ma, will trip on earth leakage if a fault occures from live to the metal case of a switch where no cpc is present ? I think it will as the RCD is looking for an imbalance between line & neutral and this will occure if a person touches the metal switch and...
  20. P

    120v between cpc and earth bar !

    I was carrying out an r1+r2 today and when disconnecting the cpc out of the earth bar to link worth the line it sparked on removal from the earth bar.... I tested between the cpc and the earth bar and got 120v Tncs earthing arrangement I've carried out insulation resistance test and that was...

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