Broken CPC on Lighting Circuit

[DPG]

Yes so i'll replace the cable, it's just whether to run a new one from CU or the easiest option from an existing circuit

It's going to have to be from the CU surely?

 

[briefcasedan]

It's going to have to be from the CU surely?

That's the question.... its only a couple of rooms... so I could extend an existing lighting circuit. Be just like adding some extra lights to an existing circuit??

 

[Spoon]

I have no CPC from CU to first lighting loop Switch. That's my problem

Ok, so as @DPG stated above, surely you need to replace the cable from the CU? or am I not understanding it correctly...

 

[briefcasedan]

Ok, so as @DPG stated above, surely you need to replace the cable from the CU? or am I not understanding it correctly...

Maybe I'm not explaining very well, apologies.
Yes I need to get a good Line, Neutral and CPC to replace broken cable and the way I see it I can achieve this in 2 ways.

1. New Cable from the CU
2. New Cable from the Loop out from an existing Lighting Circuit.

Does this make sense?

 

[davesparks]

What's wrong with extending the end of another existing lighting circuit to join this one with a new LNE ?
This would be easier for a new cable run back to the CU. The old cable would then be disconnected.

Someone will have designed this installation with the number of circuits it has, to then reduce the number of circuits by joining them together seems like a bad idea.

Without seeing the installation and understanding what is on each circuit and why it's very hard to offer any other advice than to repair or replace the damaged cable.

 

[briefcasedan]

Someone will have designed this installation with the number of circuits it has, to then reduce the number of circuits by joining them together seems like a bad idea.

Without seeing the installation and understanding what is on each circuit and why it's very hard to offer any other advice than to repair or replace the damaged cable.

It's been very badly designed with approximately 4 lighting circuits doing only 2 rooms each.

Sounds like my best bet is too run a new cable from the CU no matter how diificult

 

[Spoon]

It's been very badly designed with approximately 4 lighting circuits doing only 2 rooms each.

Are these 4 circuits coming back to individual breakers?

 

[littlespark]

What is the wiring method?
If T&E, then I would expect a break in the cpc to be next to a break in the L or N.

Likely just a loose connection somewhere accessible (fingers crossed)

If each circuit is only doing 2 rooms, then, why not extend one of the other circuits to pick up whats affected by the break?
You'll just have to ensure that all old cables that are now redundant are stripped out as much as poss.

 

[briefcasedan]

Are these 4 circuits coming back to individual breakers?

Yes that's right

 

[davesparks]

It's been very badly designed with approximately 4 lighting circuits doing only 2 rooms each.

Sounds like my best bet is too run a new cable from the CU no matter how diificult

In that case maybe joining the affected lights to another circuit would be a viable soloutiin.

 

[Toneyz]

Have you done an insulation resistance test and proved it's not a fault by a nail or screw or a joint box somewhere and the cpc has come out of the connection?