wessex:
I can see having two cpc's per earth terminal could produce a weakness/reliability issue.
Agreed, if it were required by BS7671 to have a continuous earthing (and possibly live) conductor in radial circuits it would mitigate a failed termination causing loss of earthing in another accessory. The conductor is bent and looped into the terminal, thus maintaining continuity. It is a trickier wiring job, looping cables into accessory boxes without cutting the cable, leaving enough slack, but not too much. Note that this would not be allowed by 543.7.1.204 if there was a ring, since each end needs to be terminated in separate terminals, but would be allowed by it if there was a parallel "ladder" arrangement with two CPCs
wessex:
I can see having two cpc's per earth terminal could produce a weakness/reliability issue.
Agreed, if it were required by BS7671 to have a continuous earthing (and possibly live) conductor in radial circuits it would mitigate a failed termination causing loss of earthing in another accessory. The conductor is bent and looped into the terminal, thus maintaining continuity. It is a trickier wiring job, looping cables into accessory boxes without cutting the cable, leaving enough slack, but not too much. Note that this would not be allowed by 543.7.1.204 if there was a ring, since each end needs to be terminated in separate terminals, but would be allowed by it if there was a parallel "ladder" arrangement with two CPCs
