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cpc

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  1. J

    Calculate the min size of cpc giving consideration to disconnection times and thermal

    Hi everyone, On the drawing it says the system's TN-C-S with declared Ze = 0,008 Ω and prospective fault current declared as 50kA When I calculate If = Uo / Zs = 230 / 0,716 = 321 A . With this value there's no way to match with 10A curve at fig. 3A6 (appendix 3) But if I calculate the...
  2. M

    cpc

    Hi guys. Correct me if I'm wrong your cpc and earthing conductor should be no less than half the size of your line conductor.
  3. M

    15v on cpc

    Hi all I'm struggling to get my head round while I'm getting 15v on the ring main cpc, but when I turn the lighting circuit off it drops to 0v can any1 else work this out.
  4. B

    Equivelent CPC sizes for metal trunking

    Hi Im looking for a table that gived the equivelent cpc that a metal trunking would provide. many thanks,
  5. TaffyDuck

    Voltage on CPC from PV Array.

    Hi Guys I wonder if someone with more experience of PV might be able to give me some advise. Was called out today to a domestic building with a remote barn on which a 4kW PV array is sited. The Inverter is in the barn and a long (50m) 2.5mm twin and earth in pipe (historic) feed back to the...
  6. W

    No cpc to lighting circuits

    Went to change a light for a local estate agent today, No cpcs to the lighting circuit would i right right if i said the circuits would have to be rewired?
  7. B

    Final ring circuits with radial CPC

    Have justed looked at a job to replace the consumer unit and it appears that both the final ring circuits ( Kitchen and the rest of the Flat ) have Radial CPC's. The flat is wired in multicore Singles and Plastic Conduit , has anyone come across this type of design before. Both "ring circuits"...
  8. Rockingit

    6mm integrated CPC of 16mm 6242Y used for main earth

    My adiabatic maths says that for a 16mm main conductor, assumed Ze of 0.2, 80A 88:3 CPD, k as 115.... the earth only needs to be 3.16mm therefore the 6mm in a 6242YH 16mm is more than sufficient. Anyone disagree?
  9. S

    Consumer Unit Change - No CPC on lights - Borrowed earth

    Been asked to change a consumer unit On inspection found out that customer had done much of the work himself - approx 20 years ago Currently has old Wylex NN Board Ring Mains & Kitchen appear OK - T&E Lights have no cpc, except for a couple with metal fittings. The lights with metal...
  10. B

    Insulation resistance testing with no cpc

    When doing a CU change and lights have no cpc. Every room has class 2 dimmers and lights. ceilings are like 20 foot tall. How would you guys go about Insulation testing? L&n to cpc ain't an option and removing all lights and bypassing dimmers is consequently going to take some time... What would...
  11. B

    Extending cpc ?

    Is permissable to extend the earth conductor in t/e by soldering? I have a job where all the earths in a small extension have been cut off (lighting only) . Not really enough cable to get a through crimp on and rewire is out of the question.
  12. B

    missing cpc sticker

    Does anyone know where I can purchase x 1 "missing cpc sticker" yellow
  13. K

    No CPC in submains cable

    Hi all just done pre site survey on a job found the following (never come across this before) 2 ccu's in the property 1 located next to the incoming head (A) and the other (B) is located approx 15 meters away Both CCu's are feed via henley block. (A) tails are 25mm however the cable feeding...

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