is a discontinuous CPC, where all accessory points are Zs good, on a RFC, with no RCD protection, potentially dangerous or just needing improvement ?

Question

as time moves on and opinions shift - especially via pressure from changes in Regs, H&S, CP Scheme influencers; what was once safe is now not safe and all that ! 
 
 e.g some now may consider the lack of RCD additional protection to skts (even if everything else is ok) is a potentially dangerous situation, where as previously that may not have been the case; same goes for lack of RCD to lighting circuits and even more so if circuit serve/pass a bathroom . 
 
 therefore, to the subject question as written ... what's the consideration 'today' please ? 
 and then, same question but where RCD protection on the RFC is present ? 
 
 and best wishes to all for a lovely day 
 Habs

gkenyon · Answer

BPG4 Issue 6 lists this as C2 (page 17) plain and simple because of the discontinuous cpc. 
 Whilst Zs may be OK for disconnection time, you've provided no further information regards csa and type of OCPD, so the thermal effects is still open to question. 
 Most importantly, the discontinuous cpc doesn't meet the requirements for protective conductor of an RFC of Regulation 543.2.9 (except if the RFC in its entirety is enclosed in continuos metallic containment that is also used as the cpc for the RFC ... but then it won't be discontinuous?).

is a discontinuous CPC, where all accessory points are Zs good, on a RFC, with no RCD protection, potentially dangerous or just needing improvement ?

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