Doubling up conductors

[Amp David]

IM unable to answer your question and IMO others answering havent read correctly that its not PARALELLING your talking about but using 2 cores for Live n 2 cores for neutral within the one 4 core SWA ?? Thats how Iv read the question please correct me if Im wrong ??

You are correct, thats exactly what i'm thinking.

 

[Adam W]

Try 523.8 Conductors in parallel.

 

[IQ Electrical]

Ah, the myths carry on, of course you can use parallel conductors, it's common practice in large installations where CSA's of distribution circuits etc. would be physically impossible to work with in the space provided!

On the other hand, if we're talking about bootlace SWA's of say less than 95mm then I'd say it's poor design.

 

[tonys]

Do you parallel them up?

Just re read my post and was meant to say do you mean parallel them up?

Like others have said, nothing wrong with it all, normally the engineer who designs the "big boys jobs" makes these decisions.

But a part from doing it on "bigger boy cables" I must admit in front of my mate IQ, I done it for mate with a small 4 core swa for a supply to his garage and exported the Earth as well, beat that for pushing the boundaries to the extreme lol

 

[Percy]

I would not find anything wrong with this. On large cable runs for sub mains, we sometimes install parallel circuits. The cables are a lot easier and quicker to install. I usally use a cable manufactuer web site to work out a cable design. Draka or AEI cables have got a program you can do on line.

 

[Amp David]

Just re read my post and was meant to say do you mean parallel them up?

Like others have said, nothing wrong with it all, normally the engineer who designs the "big boys jobs" makes these decisions.

But a part from doing it on "bigger boy cables" I must admit in front of my mate IQ, I done it for mate with a small 4 core swa for a supply to his garage and exported the Earth as well, beat that for pushing the boundaries to the extreme lol

Naugthy boy!

 

[Amp David]

This ones a case of the cable is installed from previous and as cost is always an issue these days, so rather than supplying and installing new cable then doulbling up 1 fore core is more cost effective.

Thanks for you help people!

 

[JLD]

I would say that it's fine for cpc but for phase conductors no. If you dropped one of the connections for a cable in parallel then you'd run a very high risk of overheating.

Even if it's a distribution circuit only terminated at either end, I still wouldn't risk it, with what device would you protect the cable?

I would say it is not fine for a cpc under the same reasoning though. If you loose one of the cpcs then your Zs will raise as your R2 reading increases. This in turn would effect the fault current able to flow and so you would not achieve your disconnect times.

 

[telectrix]

as long as the conductors are well twisted and taped............

 

[i=p/u]

its fine , geeeeeeee;s

 

[IQ Electrical]

I would say it is not fine for a cpc under the same reasoning though. If you loose one of the cpcs then your Zs will raise as your R2 reading increases. This in turn would effect the fault current able to flow and so you would not achieve your disconnect times.

BS 7671:2008 makes no distinction between line conductors and cpc's on parallel cable installation.

By your logic, a standard ring final would be 'not fine'.

 

[Amp David]

How could one of the conductors become disconnected when they are both crimped into a ferrule?

 

[tonys]

How could on eof the conductor become disconnected when they are both crimped into a ferrule?

Often hear people talk about if and buts, so I can only imagine someone must go around pulling wires out of things for a laugh lol

 

[Amp David]

In this trade I think people worry to much about what could happen, rather than just getting on with it.

 

[tonys]

In this trade I think people worry to much about what could happen, rather than just getting on with it.

You know why don't yer, because of the fear the regulators instill in their brains.