Various guidance shows running an additional cpc as a ring. What are the implications of running two cpc’s, but terminate them as the radial, each cpc being terminated in a separate terminal within a twin earth accessory. Each circuit cpc then terminated separately back at the DB. This would do away with usual steal link on the accessory. Amount of terminations would be the same.
says it should comply with 543.7.1 and 543.7.1.204 says connections should be made at all points throughout the circuit, so a ring would not be allowed, more like two ladders. There seems to be a contradiction here
543.7.1.204 says:
543.7.1.204 Where two protective conductors are used in accordance with Regulation 543.7.1.203(iii), the ends of the protective conductors shall be terminated independently of each other at all connection points throughout the circuit, e.g. the distribution board, junction boxes and socket-outlets. This requires an accessory to be provided with two separate earth terminals.
I'd don't read that as requiring both runs of c.p.c.s to visit every connection point in the same order - as long as there are two independent c.p.c. paths back to the DB, one may be 'clockwise' around a ring and the other can be 'anticlockwise' as it were.
Likewise two PE terminals should suffice even when there are more than two c.p.c.s present. E.g. on a spur from a ring the two c.p.c.s from the spur may connector (one each) to the two PE terminals at the back of a socket on the ring along with the two c.p.c.s of the main ring. I see the basic requirement as nothing looses earthing if one terminal comes completely apart or one wire snaps.
says it should comply with 543.7.1 and 543.7.1.204 says connections should be made at all points throughout the circuit, so a ring would not be allowed, more like two ladders. There seems to be a contradiction here
543.7.1.204 says:
543.7.1.204 Where two protective conductors are used in accordance with Regulation 543.7.1.203(iii), the ends of the protective conductors shall be terminated independently of each other at all connection points throughout the circuit, e.g. the distribution board, junction boxes and socket-outlets. This requires an accessory to be provided with two separate earth terminals.
I'd don't read that as requiring both runs of c.p.c.s to visit every connection point in the same order - as long as there are two independent c.p.c. paths back to the DB, one may be 'clockwise' around a ring and the other can be 'anticlockwise' as it were.
Likewise two PE terminals should suffice even when there are more than two c.p.c.s present. E.g. on a spur from a ring the two c.p.c.s from the spur may connector (one each) to the two PE terminals at the back of a socket on the ring along with the two c.p.c.s of the main ring. I see the basic requirement as nothing looses earthing if one terminal comes completely apart or one wire snaps.
