Reg:5220.127.116.11 gives a number of options for circuits been supplied with a protective conductor exceeding 10mA with (i) stating "A Single protective conductor having a CSA of not less than 10mm.
Is this additional to the CPC?
We are installing a piece of equipment that the manufacturer has advised has a standing leakage of between 36-49mA. The equipment is balanced 3 phase and already has a 25mm 4-core cable installed so I have suggested that we use the spare core for the earth as this also satisfies the above regulation but my colleagues say we still need to install an additional cable or use the SWA also.
Please could you help clear this one up.