Adding to existing lighting with no CPC

[TomSparkman]

To clarify its a mixture of old twin and earth and single browns for S/L back to rose. There isnt anycpc visible at switches but the sheathing has been stripped too far back so i cant see whether the cpc has been simply cut out at all switches or non existent. In the rose there is only two cpc core (loop in and out).

I think ill take the advice of either rewiring the circuit or nothing at all to be honest. I want to do a proper job, not a bodged one

 

[1Justin]

You might consider wireless. It's not nice and is something of a cop-out but it might be useful here. Megaman RF works (I think..do check) without neutral.
There are some slightly irritating switching delays, but means you can replace existing switches with class 2 switches (no CPC), and add another ("glued" to the wall), anywhere. - I have done this in the same circumstances when there was really no rewiring option.
Take care with LED bulbs though and use ones recommended by Megaman. The switches leak a small current (in order to operate) and it's enough to begin to light up some brands when "off".

 

[Pete999]

So to clarify my knowledge. Any alteration or addition to an existing circuit forces the need whole circuit to be brought up to current regulations?

Thanks

Not necessarily, you will of course need to ensure the circuit you are altering complies with 7671. Example , adding a lighting point to an existing circuit, if that circuit complies, then go ahead and add the new lighting and issue a MNWC

 

[TomSparkman]

Just to give everyone an update if anyone is interested.
I rang the Napit technical team about this problem after taking in to account everyones advice on here.
He told me that it was fine to pull a 4mm earth single from another circuit to the new switch ill be putting in. In order to make sure my 3 core is earthed.
He said that would be adequate i dont have to bring the whole circuit up to current regulations.

Thabks fpr the advice everyone

 

[Toneyz]

I would prefer to take the earth from the lighting circuit involved.

 

[telectrix]

I would prefer to take the earth from the lighting circuit involved.

me too.

 

[hightower]

CPCs weren't allowed to be omitted from lighting circuits after 1966 (I think off top of head), so if the wiring is 70s as I've read in post #1, there should be CPCs somewhere.

 

[Toneyz]

CPCs weren't allowed to be omitted from lighting circuits after 1966 (I think off top of head), so if the wiring is 70s as I've read in post #1, there should be CPCs somewhere.

There is at the light pendants but not at switch