cpc

  1. codger

    Missing cpc in domestic lighting circuit

    Morning. A friend and I have been carrying out some EICRs on properties in our area. Recently, my mate has come across two houses in which the lighting circuits do not have any earthing at all. They have been run in twin and earth but the earths have all been snipped off at lighting points...
  2. J

    Shock overcurrent ignored in recommendations?

    It is my reading that doing impedance tests we like a nice low resistance in theory overall and especially for earth , both Ze and R1 or both R1 and/or R2. This makes a high potential fault current Uo/Ze, way above the allowed fuse sizes for a light circuit or many power too. So do wires really...
    • jimny
    • Thread
    • cpc learning overcurrent question recommendations shock
    • Replies: 10
    • Forum: The Welcome Forum
  3. akwoody2

    Sharing Cpc - Two Lighting Circuits

    Hi Chaps, Carried out a condition report today and found two lighting circuits using the same CPC, 4mm single. Seems the lighting never had a CPC and someone has added the 4mm at a later date. From what i understand the 4mm is ok but is it ok for two circuits to share the same CPC? Thanks in...
    • akwoody2
    • Thread
    • circuit circuits conduit cpc lighting share sharing system
    • Replies: 9
    • Forum: Lighting Forum
  4. S

    Swa Cpc

    Sintra submitted a new resource: SWA CPC - SWA CPC Read more about this resource...
  5. bigspark17

    Submain 16mm t&e cpc chopped

    EICR.. 80 switch fuse in meter cupbord, 16mm t&e to cu with 6mm cpc chopped both ends and 16mm earth ran along side submain. zdb/pefc/pscc fine. bonding from db fine. i would never do this but struggling to find a reg number aggainst it :/ opinions appreachiated
  6. rustynails

    CPC outisde junction box

    Why was it so popular to joint the CPC's outside junction box back in the day, answers on the back of a postcard please? I guess they never made junction boxes with enough terminals.
  7. charlie76

    No CPC in lighting circuit

    Evening all. I have been asked to quote a landlord for a replacement bathroom light as the old ones bayonet fitting was broken, new pull cord as it was one from 1702 which had finally given up and replace the hallway light fitting as it was hanging off the ceiling. On inspection there are no...
    • charlie76
    • Thread
    • circuit class cpc fitting landlord lighting lighting circuit no cpc situation
    • Replies: 42
    • Forum: UK Electrical Forum
  8. P

    SWA seperate CPC

    Hi guys, how would you code a SWA cable which feeds a DB within a commercial unit with no seperate CPC so only realying on the SWA strands as means of CPC
  9. G

    12v deck lights with cpc

    Hi all. Been asked to fit some decking lights, customer has bought 20 of the from ebay. 0.75 flex, three core. Initially i thought these were 230v, but upon connecting 12v across live and neutral they light. Are these just 12v but wired in flex with a LNE? Cheers.
  10. N

    Cpc

    Does the Cpc in circuit need to be the same size as the line conductor when using singles any help thanks
  11. F

    Calculating minimun sized CPC

    Hi all, just working through an assignment at the moment, got everything done other than two questions worded "select an appropriate minimum sized CPC and confirm your selection by calculation". I've already calculated my tabulated current, volt drop and live conductor size for each question...
  12. uksparks

    No CPC in bathroom - class 2

    Hi, just looking for for a bit of advice i changed a board yesterday for a house I have been working on in their kitchen. i came to test the bathroom lights in the downstairs room bolted on the back of the house with flat roof to discover that there is no CPC at the light or pull switch, they...
  13. L

    Singles in PVC conduit, all insulated accessories, do you need a CPC??

    Only reason I can see is if accessories might be changed to those with metallic enclosures in the future and then you'd need to pull a CPC in which would be a big hassle? No sockets, just lights which are supplied with 2 core flex, Ansell 50w led floods.....linked by PVC conduit, fully enclosed...
    • Lazlo
    • Thread
    • accessories conduit cpc fully insulated metal pvc singles
    • Replies: 4
    • Forum: UK Electrical Forum
  14. A

    Continuity of cpc on 2 core SWA cable

    Hello I was wondering if anyone could help me on what is the most appropriate method to test continuity of cpc on a 2 core steel wire armoured cable to a distribution board.
  15. P

    Cooker circuit fault. Live cpc!

    Hi guys. We have been brought into a domestic installation to complete remedial works. The previous electrician who worked for a builder was not very competent in his work and also could not sign off any of his work. He wired a new extension which included a kitchen. The council has been...
    • phil333
    • Thread
    • circuit cooker cpc fault live
    • Replies: 20
    • Forum: UK Electrical Forum
  16. R

    CPC Calculation

    Hey all, To calculate the resistance of the CPC you end up with an equation with (R2 + RN) / 4 = R1 where R1 is the line conductors resistance, R2 is the CPC resistance and RN is the resistance of the neutral wire. My question, Is this method below also an acceptable way of doing it (if the...
  17. B

    Lighting cpc

    Good evening We have recently replaced a class 1 light. The cpc was provided via aa separate cable. I have found this evening that the separate cpc cable has been spliced into the main equipotential bonding cable (10mm2). Doesnt this mean that the lights are now connected directly to the...
  18. A

    4 submains with one common CPC

    I have a query. 4 distribution boards, each fed by 25mm2 double insulated tails (approx 30m away) in a roof void. Only 1 16mm2 earthing conductor for all 4 submains. The earthing conductor is then connected at the first board and looped to the other three boards. Is this acceptable? I thought BS...
    • atm84
    • Thread
    • common conductor cpc earthing mains separate supplied tails
    • Replies: 40
    • Forum: UK Electrical Forum
  19. Z

    Verifying SWA CPC suitability disconnection times / adiabatic equation

    As you may know looking at some of my posts I've been thrown back in the deep end recently – and don’t have much experience with complicated calculations. As this is the first time I've used SWA to go from the main supply to the primary CCU, and as I'm using the steel armour as my CPC, rather...
    • ZEDEZ
    • Thread
    • adiabatic cpc disconnection disconnection times equation swa times
    • Replies: 9
    • Forum: UK Electrical Forum
  20. uksparks

    Separate CPC

    Hi, im doing a partial reword for someone at the moment, some of it was going to stay but have convinced them otherwise. some of it that was going to stay is wired as below, I've ripped all of it now, but it was wired with grey twin cable no CPC then a separate un sheathed earth as per...
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