IET announces new amendment to BS 7671 (IET Wiring Regulations)

Thanks for the link to BSi.  The intro is revealing. Nothing has really changed; just perception due to the use of the word "supplementary". The standard does not state they are not suitable for Additional Protection, only along the lines of "supplementary" protection downstream is afforded [only]. That can be "supplementary protection" to fault or basic protection [ in-direct/direct in old money ]. The word Additional is not used as that is sub divided into two parts, the second including the sometime protection of buried cables . It is highlighting the limit of an accessory at the boundary of the fixed wiring. So in respect of AP, this is "direct contact" only as opposed to cables buried in walls. The design of the devices only has to meet the limited cable lengths that would be experienced at what is the extremity of the fixed wiring. It is not really anything new in the case of socket outlet RCDs; perhaps for RCD FCU it is more of a "problem" [?] if the spur "protects" a large length of downstream buried wiring .

Thanks for the link to BSi.  The intro is revealing. Nothing has really changed; just perception due to the use of the word "supplementary". The standard does not state they are not suitable for Additional Protection, only along the lines of "supplementary" protection downstream is afforded [only]. That can be "supplementary protection" to fault or basic protection [ in-direct/direct in old money ]. The word Additional is not used as that is sub divided into two parts, the second including the sometime protection of buried cables . It is highlighting the limit of an accessory at the boundary of the fixed wiring. So in respect of AP, this is "direct contact" only as opposed to cables buried in walls. The design of the devices only has to meet the limited cable lengths that would be experienced at what is the extremity of the fixed wiring. It is not really anything new in the case of socket outlet RCDs; perhaps for RCD FCU it is more of a "problem" [?] if the spur "protects" a large length of downstream buried wiring .