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Ring Circuit - 2 x 2.5mm Live Conductors but the CPC has two different leg sizes - 1st leg is 1.5mm and 2nd leg is 2.5mm

ElectricalCuriousity

Hello

On an EICR carried out, I found the following below.

Line Conductors - 2.5mm

CPC Conductors - 1st Leg = 1.5mm, 2nd Leg = 2.5mm.

Although it isn't best practice, is there actually anything wrong/non compliant with the reduced CPC on one of the legs? I can't seem to find any issues with this in the regs.

Thank you in advance.

Parents
  • +1

    you can use the adiabatic equation to determine the minimum CPC size

    1.5mm CPC in twin and earth has been acceptable for a good while now.

    So your 2.5mm is probably oversized.

    I have heard of same size cpc in Irish twin and earth, with i think insulated 2.5mm CPC. Not sure whether it is recognized by BS7671 though. No disrespect whatsover to the Irish of course.

Reply
  • +1

    you can use the adiabatic equation to determine the minimum CPC size

    1.5mm CPC in twin and earth has been acceptable for a good while now.

    So your 2.5mm is probably oversized.

    I have heard of same size cpc in Irish twin and earth, with i think insulated 2.5mm CPC. Not sure whether it is recognized by BS7671 though. No disrespect whatsover to the Irish of course.

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