Hello, I am dealing with an office refurb and existing installation consisting of about 8 rotary isolators on a ring circuit wired with 2.5mm2 singles and fed by BS88 32Amp fuse. From as builts it appears isolators supposed to serve power poles which appears were never installed, but I would like to reuse the existing circuit to feed new HRU - about 3Amp 1ph supply. Do I need to change the circuit to radial/replace isolators with fused spurs or can I reuse one of the existing isolator? I feel I can't use the isolators but doubt arose in me when my boss said that he thinks using isolators is compliant with BS. Please let me know, thank you :)
Wiring route is obvious, however there is no RCD protection as this was installed back in early 00s. For obvious reasons I don't want a mechanical fan on an RCD circuit especially that it's fed off from the fuseboard rather than a standard DB.
But from isolators point of perspective is it okay to have isolators on a ring rather than a twin sockets or a fused spur? Appendix 15 of BS7671 doesn't say anything about anything else than TSSO and spurs.
Wiring route is obvious, however there is no RCD protection as this was installed back in early 00s. For obvious reasons I don't want a mechanical fan on an RCD circuit especially that it's fed off from the fuseboard rather than a standard DB.
But from isolators point of perspective is it okay to have isolators on a ring rather than a twin sockets or a fused spur? Appendix 15 of BS7671 doesn't say anything about anything else than TSSO and spurs.
