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Rcd discrimination

NGUACE
Any Information greatly appreciated.


Each outdoor socket has to be RCD protected, so if you have a junction box supplying more than one outdoor 30ma socket, how do you achieve RCD discrimination all the way back. I have an older C/U and the rcd on it is also 30ma?


A spur from internal plug to fused switch outside, which then feeds multiple outdoor sockets?


this is just a scenario I am trying to figure out.


thanks for anyone’s time.


Andy
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    mapj1:

    If you have an RCD in the supply to the socket, either at the socket or back at the dis board, then the socket meets the regs, as it has RCD protection. The regs do not care about where.


    They do, however, care about the standard that the RCD is manufactured to. The RCDs in the socket-outlets, if none are provided upstream, should comply with the standards stated in either Regulations 531.3.4.1 or 531.3.4.2 for fault protection, or Regulation 531.3.6 for additional protection.


    BS 7288 is currently not accepted in BS 7671 for RCDs - but if the installation design was conducted, and any additional sock-outlets installed, under BS 7671:2008+A3:2015 there is no such constraint.


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  • 0
    mapj1:

    If you have an RCD in the supply to the socket, either at the socket or back at the dis board, then the socket meets the regs, as it has RCD protection. The regs do not care about where.


    They do, however, care about the standard that the RCD is manufactured to. The RCDs in the socket-outlets, if none are provided upstream, should comply with the standards stated in either Regulations 531.3.4.1 or 531.3.4.2 for fault protection, or Regulation 531.3.6 for additional protection.


    BS 7288 is currently not accepted in BS 7671 for RCDs - but if the installation design was conducted, and any additional sock-outlets installed, under BS 7671:2008+A3:2015 there is no such constraint.


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