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Afternoon - despite a recent 18th edition pass (all but one right!) I'm having a bit of a moment whilst planning some upcoming works at our site. In reality I should wait, go home, refer to the big book and go from there. But it's playing on my mind and I can be a bit impatient. Also, I guess there may be a bit of a conversation here about existing circuits?

Situation is as thus - need to provide a spur for sign installers to install a backlit sign - all 24v LED stuff - Class 2 transformer, connected to switched fused spur.

Unbelievably (but not altogether unexpectedly), when checking how the land lay, I found a live but unused spur floating around above the suspended ceiling - an old Ashley thing, complete with smashed backbox and a bit of tape on saying "Live" (this isn't unusual in an ex-public building that has had 60 years of various companies and sub-sub-subcontractors doing reactive 'maintenance' classed works with no real records left).

So, traced the FCU - fed in old colour FP200 from a mid 90's Federal board on its own B16 - old plans indicate it used to feed a former Fire Alarm system before it was decommissioned and replaced/relocated 20 years ago. No other appliances on circuit. Zs well within. IR not yet done.

So - do I need to protect any part of this circuit with an RCD? I deduce not, as its not a socket outlet upto 32a - its a fixed appliance. And the circuit itself already exists as installed.

My brain started going down this path because really, all I'm doing is connecting an appliance - the circuit itself is already in situ.

Appreciate there's options here and the obvious thing is to shove an RCD in- source an RCBO for the board; fit an RCD in a DIN enclosure; fit one of the much debated RCD spurs ....but does it really require one? (I can't really see the risk from the appliance perspective - it's more the fixed wiring - but as I say - that already exists).

Apologies for the musing of such a small thing - but just thought I'd throw it out there
 
Everyone is entitled to their own opinion but the spec'n clearly says "In direct contact with the CPC".

Cant say I've tested every one but those cables I have tested have proved to be a reliable connection between the cpc and shield and in my opinion provide adequate protection for compliance to 522.6.204(i)

in the eyes of
Do the 'Eyes' have a reg No.?
 
I think he knows what he is doing, and it probably is already safer as he's found the breaker.
My only thought is it would be good to improve on the "floating around on suspended ceiling".
Ah. That time I was nearly killed, you mean? Shop refit, lifted a tile to chase a cable run, laying on top of the tile was the aluminium tumble dryer style hose of a cheap AC job from a nearby vent, rolling around and floppy like it does, it rolled into the curve of my neck/shoulder and bit. HARD, right on all the bits of you that really don't want a belt, on bare sweaty skin. Steps went from under me which interrupted the belt. Later investigation, some absolute ******* had in the past simply snipped a live cable and left it loose up there, the hose had rolled onto it.
 
[ElectriciansForums.net] Fixed Appliance RCD Protection

Thought the bit that said BS as in BS 7629-1 was British Standard and funnily enough it is listed and recognised on page 434 of the regs.
 
Everyone is entitled to their own opinion but the spec'n clearly says "In direct contact with the CPC".

Cant say I've tested every one but those cables I have tested have proved to be a reliable connection between the cpc and shield and in my opinion provide adequate protection for compliance to 522.6.204(i)


Do the 'Eyes' have a reg No.?
 
I can't see it on page 434 but that British Standard is the specification for fire resistant cables.
Isn't this all starting to lose the point? I think we've established that the circuit doesn't need an RCD unless the instructions ask for one??
 
Isn't this all starting to lose the point? I think we've established that the circuit doesn't need an RCD unless the instructions ask for one??
You know what we're like on here drifting off the point?
 

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