CPC's in PVC conduit

[Benjo]

I am currently wiring a heating system in PVC conduit and plastic back boxes for the room stats. I could do with not having to pull Earth wires through the conduits because in some places it will be quite tight. I want to know if I can not install the CPC's to save a bit of space in the conduits? Bear in mind that there are no metal components installed.

 

[sellers]

Class 2 items must have cpc's terminated in the accessory.

 

[NozSpark]

Bigger conduit????

 

[Sharpend]

I am currently wiring a heating system in PVC conduit and plastic back boxes for the room stats. I could do with not having to pull Earth wires through the conduits because in some places it will be quite tight. I want to know if I can not install the CPC's to save a bit of space in the conduits? Bear in mind that there are no metal components installed.

This seems to be a design flaw, as there are regs relating to number of cables in conduit and air space room required. Or am I misinterpreting what you are saying?

 

[SLIPSHOD & SLAPDASH]

Bit of yellow 77 on the cables and they will glide in like one of Steptoe's earth rods into a bit of clay.

 

[steptoe]

slippey stuff works for me every time,

maybe Apache could recommend some good stuff,

 

[Doc Hudson]

What do the manufactures instructions say for the wiring of the components. Do they suggest a CPC is required?

Doc H.

 

[NozSpark]

What do the manufactures instructions say for the wiring of the components. Do they suggest a CPC is required?Doc H.

IIRC BS7671 requires that every accessory has an earth run to it even if it's class 2

 

[Evans Electric]

You could go with 1.00mm 6491X I guess , (assuming you are trying with 1.5mm .)

 

[Zeespark]

Deke, I think you can only get 1mm 6491X by special order now.

AndyGuinness

 

[batty]

Don't think I have come into contact with it.

 

[PC Electrics]

If it's going to be tight, perhaps you should look at either

1. the size of the conduit

or

2. the size of the conductors

Is this a GFCH system on a 3A 1362? If so you could go down to 0.75 for the conductors (unless they are very long or you're using a massive pump).

Also look at what all the conductors are doing to see if you are duplicating any (esp neutrals, earths and perm lives)

Try Maplin for smaller singles.

---------- Post Auto-Merged at 20:24 ---------- Previous post was made at 20:23 ----------

Oh, sorry, original question:

yes you need to take a cpc to each accessory

 

[Evans Electric]

I suppose ,for heating controls in conduit you could 0.5mm instrument cable if you were really stuck with a dodgey conduit run. I've got some we had from RS the current rating without checking must be 3-5A I spose. Bit rough TBH . As said, theres only the pump pulling any current.

---------- Post Auto-Merged at 01:56 ---------- Previous post was made at 01:54 ----------

Deke, I think you can only get 1mm 6491X by special order now.AndyGuinness

I'm sure you're right . We used to use it for control wiring . It would cost too much if its special order .

 

[Sidewinder]

0.5 Tri would not be special order though, mind the OD may be a little bigger than 6491, but, it would be MUCH more flexible.