single core cables in round conduit

[sijaysee]

good idea or not?

an advantage would be more cables allowed

disadvantage would be stripping everything down

what do you think?

 

[RMS]

Stripping everything down?

Do you mean twin and earth? If so why not use singles?

 

[ericmark]

In what environment? Industrial, Domestic etc.

 

[sparkyspike]

I think you should buy single core cables rather than stripping t+e.

 

[sijaysee]

yea it was just a thought.
gotta job coming up with a load of outdoor wiring and thought it would look much neater in conduit. If i used singles, how big do you think the conduit would need to be to carry a 4mm radial and a 2.5mm ring?

 

[Lectrician]

There are cable factors in the OSG to BS7671 which are used for this purpose.

 

[Taylortwocities]

how big do you think the conduit would need to be to carry a 4mm radial and a 2.5mm ring?

Don't forget that you'll need to consider grouping factors when you do your cable calculations. So you may find that it is not a 4mm radial and a 2,5mm ring after all!

 

[sijaysee]

can u join single core cables to ordinary non stranded cable with crimps?

 

[Chri5]

You could, but FFS why would you ?

New engine in a car with failed MOT springs to mind.

Do the job correctly, stop trying to fudge part of the works.

 

[sijaysee]

existing ring main is there and i need to take it outside in conduit.
what would you suggest?

 

[sparkyspike]

If you need to extend the circuit, do it at a socket outlet, rather than using crimps.

 

[oharaf]

I would be looking to run a seperate circuit outside, you know what effect the weather can have when it creaps in!!!!!!!!

However if you want to extend the ring then like suggested do it from a socket rather than crimping or do it as a fused spur!

 

[chris765]

Dont forget PVC conduit isnt UV stable therefore can become brittle when exposed the the sunlight.

 

[securespark]

IME, black PVC conduit is OK.

I installed some in 1984 outside my father's house. It's still in excellent condition today. Slightly faded, I grant you, but it's not lost any of its physical strength.

I even tested it recently (last winter!!) with a hammer and it is still impact resistant.

 

[chris765]

Ah thats interesting. Was just what I was taught at college, have not been around long enough to test it long term, I wasnt even thought of in 1984 haha!