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

psychicwarrior

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

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    A discontinuous c.p.c. on a ring raises a number of questions - how has it come about? A loose connection somewhere (in which case there might be a point somewhere, if hidden, without an adequate earth, unless the accessory had dual earth terminals), or a damaged cable might be indicative of much more serious problems (e.g exposed live parts - even if they don't happen to show on an insulation test). Without further information it might have to be an FI. Then there's section 543.7 - if the circuit could have protective conductor currents >10mA then a further single fault (another break in the c.p.c.) could lead to shocks from exposed-conductive-parts - shocks from a single fault is a C2 in my book. I'd consider a C3 if I was happy that it wasn't a symptom of anything more serious.

    Lack of additional protection by 30mA RCD again depends - for sockets serving indoor equipment I'd say C3, but if intended to serve outdoor equipment then a C2. Likewise for bathroom circuits C3 if there's the equivalent of supplementary bonding (either actual supplementary bonding or a combination of c.p.c.s/main bonds that have the required effect) or C2 otherwise.

       - Andy.

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    A discontinuous c.p.c. on a ring raises a number of questions - how has it come about? A loose connection somewhere (in which case there might be a point somewhere, if hidden, without an adequate earth, unless the accessory had dual earth terminals), or a damaged cable might be indicative of much more serious problems (e.g exposed live parts - even if they don't happen to show on an insulation test). Without further information it might have to be an FI. Then there's section 543.7 - if the circuit could have protective conductor currents >10mA then a further single fault (another break in the c.p.c.) could lead to shocks from exposed-conductive-parts - shocks from a single fault is a C2 in my book. I'd consider a C3 if I was happy that it wasn't a symptom of anything more serious.

    Lack of additional protection by 30mA RCD again depends - for sockets serving indoor equipment I'd say C3, but if intended to serve outdoor equipment then a C2. Likewise for bathroom circuits C3 if there's the equivalent of supplementary bonding (either actual supplementary bonding or a combination of c.p.c.s/main bonds that have the required effect) or C2 otherwise.

       - Andy.

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