High integrity earthing | Page 3 | on ElectriciansForums

Discuss High integrity earthing in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

Yes the circuits do fail, they require a sheathed 2.5mm², or non-sheathed 4mm² conductor to be installed as a second CPC.
The combined value of 10mm², relates to the combined CSA of all the conductors (including live) of a multicore cable.
Yes you could have two separate 1.5mm² CPCs, if both are in conduit or trunking.
 

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