tapping into conduit wiring with no singles cpc

[J.C.E]

Afternoon guys
Got a job my builder wants me to do in nice block of flats up town
solid concrete ceilings/walls/floors unfortunately!
lighting is just staying as is- but them want extra sockets added and a new 5amp socket circuit for lights

the existing sockets are wired in single in tube in the wall but no singles cpc
-pending the tubes are sound and zs readings are good
-how would you go about adding in sockets
easy enough to add 1x spur in places- but what about if I need 2 or 3 in one place?
whats good way re 'extending' the earth in the ring...
at the mo its just a fly lead from back box into earth terms of sockets
cheers guys

 

[Pete999]

5amp socket circuit for the lights? are you intending to run a dedicated circuit for 5Amp sockets for standard lamps etc?
Why do you want to extend the cpc on the RFC?

 

[westward10]

You either use steel conduit for the cpc as like the existing or fit a suitably sized cpc from an existing back box, I would not bother making the cpc into a ring just fit a single suitably sized cpc.

 

[J.C.E]

5amp socket circuit for the lights? are you intending to run a dedicated circuit for 5Amp sockets for standard lamps etc?
Why do you want to extend the cpc on the RFC?

no sorry- they want the 5amp circuit- ideally becuase they want the control ie from a light switch etc. and a new circuit would be less hassle then tapping into the exisiting ceiling lights etc

although I have since has a idea of poss using the lightwave rf sockets and control could be from a wall mounted wireless remote switch/mood controller

 

[J.C.E]

You either use steel conduit for the cpc as like the existing or fit a suitably sized cpc from an existing back box, I would not bother making the cpc into a ring just fit a single suitably sized cpc.

thought would be the case- but was not sure about the 'maths' of trying to continue the cpc ring continuity

so you would go for- extend the ring of the L+N- then use use 4mm single as cpc

 

[westward10]

That is exactly what I would do.

 

[Pete999]

That is exactly what I would do.

How many sockets do you intend to add to the RFC?

 

[Toneyz]

What wiring method do you intend to extend these circuits ?.

 

[J.C.E]

What wiring method do you intend to extend these circuits ?.

if they want new socket directly next to existing- probly singles through a bush
if they want them spaced out a little will have to be more tube in 2.5mm i guess

 

[westward10]

No need to fit separate cpcs if it is steel tubing, imagine that

 

[J.C.E]

No need to fit separate cpcs if it is steel tubing, imagine that

well dont really want to put conduit in
but was thinking how can i extend L+N in 2.5 and then install a 4mm earth- without conduit

 

[Pete999]

Trunking, Pyro,