Adding to existing lighting with no CPC

[Pete999]

You need to have an earth at all the points to comply so 4mm2 as described in the regulation I quoted earlier, not much use just adding a 3 core plus cpc at the mid point of the circuit. Did you read the regulation or are you fling on a shoe string? It's plain enough to understand.

 

[TomSparkman]

Yes, 3 core and cpc.

Yes is see reg. 543.1.1 now.

In light of your answers it appears as though i would have to either rewire the circuit or upgrade it with a 4mm cpc to all light fittings and switches.

If this is the case i will tell the customer, however i doubt they will want to go ahead with that due to cost

 

[TomSparkman]

You need to have an earth at all the points to comply so 4mm2 as described in the regulation I quoted earlier, not much use just adding a 3 core plus cpc at the mid point of the circuit. Did you read the regulation or are you fling on a shoe string? It's plain enough to understand.

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

 

[westward10]

If you decide to pull 4.0 cpc in you may as well rewire.

 

[westward10]

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

It is a bit grey this one, me I wouldn't touch it but if you decide to use a cable incorporating a cpc it needs to be connected to earth but just the part you put in place the other can be considered existing and is probably safe for continued use.

 

[TomSparkman]

It is a bit grey this one, me I wouldn't touch it but if you decide to use a cable incorporating a cpc it needs to be connected to earth.

I agree, the termination of the 4mm would be a nightmare aswell.

This is what is confusing me. If i did add the new strapper in then i did propose to incorporate a cpc in my cable by means of a 4mm earth provided by one of my new circuits.

As pete999 said though, it almost does seem like p#ssing in the wind adding a cpc mid circuit when all of the existing switches dont have it!

 

[telectrix]

quote to rewire the circuit in 1.0mm T/E or 1.5mm T/E. customer says no, then walk away. you are neither a bodger or a charity.

 

[westward10]

This is true like I said it is a grey area as to what to do as it is a unique situation. Do you have a scheme provider to consult. This is only my opinion but I see no problem doing it using pvc/pvc singles with no cpc to all insulated enclosures.

 

[telectrix]

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

yes, and RCD protection added if reqiured. e.g.by 522.6.101.

 

[Toneyz]

Have I read the post correctly is there a earth at each of the light fittings and the switch drops but the earth has been cut off at switch.

 

[westward10]

Have I read the post correctly is there a earth at each of the light fittings and the switch drops but the earth has been cut off at switch.

No I think it is pvc/pvc singles.

 

[telectrix]

so if it's singles, it's in conduit, so why is there no cpc? where's my bottle?

 

[westward10]

so if it's singles, it's in conduit, so why is there no cpc? where's my bottle?

Not singles in conduit, pvc/pvc singles.

 

[Toneyz]

make sure earth at ceiling rose run 4.0mm earth down to one of the ends of the 3 core run. You only have to make sure the work you have undertaken is compliant not forgoing the other checks eg bonding etc.

 

[7029 dave]

Rewire the circuit or walk, don't waste your time running in single cpc's not worth the aggro.