Conduit installs

[Amp David]

As i don't really do much proper conduit work, i have what may be an obvious question to some. Within a PVC installation, if you had 2 phases feeding a light switch for 2 lots of lighting, would there be a cpc pulled in with both the feeds, or is it done with just the cpc from one circuit at the switch?

 

[telectrix]

i would put 2 cpc's in. 1 for each circuit. otherwise, you are effectively splitting a cpc between 2 circuits.

 

[Amp David]

Cheers Tel,

Would they be looped in the out to the fittings or just brought into the switch from a near by light fitting?

 

[telectrix]

run the cpc's from the dis. board to the switch position, then separate to each run of fittings.

 

[Deleted member 26818]

If it's PVC conduit with plastic accessories, then you wouldn't require a CPC at the switches.

 

[johnboy6083]

I always take a CPC to every point in a circuit, as some numpty is bound to try and put metal in. For the cost it's worth doing.

 

[Amp David]

Cheers fellas.

 

[D Skelton]

i would put 2 cpc's in. 1 for each circuit. otherwise, you are effectively splitting a cpc between 2 circuits.

Just playing devils advocate here Tel, but I can't see anything wrong with splitting a single CPC between two circuits so long as the csa is an appropriate measurement.

 

[GLENNSPARK]

Just playing devils advocate here Tel, but I can't see anything wrong with splitting a single CPC between two circuits so long as the csa is an appropriate measurement.

would that not contravene "all final circuits to be segragated" though Mr Skelton?

 

[telectrix]

Just playing devils advocate here Tel, but I can't see anything wrong with splitting a single CPC between two circuits so long as the csa is an appropriate measurement.

not sure on that, but i prefer to see a circuit comprising of all 3 conductors. suppose at some time in the future, one of the circuits was no longer needed and disconnected. the other circuit would then be left without a cpc.

 

[topquark]

and if someone wants to add rcbo protection at a later date? It'll make it harder to track down the fault.

 

[Adam W]

I'd take one CPC to the switch to earth the switch; if you 'had' to take a CPC for every live you might have each switch on a different cct so you could end up with about 20 cpcs in the switch, which would be silly.

Because it's being done in singles the CPCs for the lights can go straight from the CU to the lights, with the neutrals.

 

[D Skelton]

would that not contravene "all final circuits to be segragated" though Mr Skelton?

Check out reg 543.1.2. Where a protective conductor is common to two or more circuits...

not sure on that, but i prefer to see a circuit comprising of all 3 conductors. suppose at some time in the future, one of the circuits was no longer needed and disconnected. the other circuit would then be left without a cpc.

Me too. I agree, I would pull two CPC's through too. I'm just sayin', that's all

 

[GLENNSPARK]

Check out reg 543.1.2. Where a protective conductor is common to two or more circuits...



Me too. I agree, I would pull two CPC's through too. I'm just sayin', that's all

Thank you Mr Skelton....I stand corrected.....:6: