SWA Cable


Postby stevenc1603 » Tue Nov 06, 2007 11:48 pm

Bit of an odd one for me this.

I am putting in an office in the summer house.

In order to get power out there I have purchased and run in some 3 core SWA cable.

Now I know that the wire colours have changed, but with 3 core I expected to find a brown, a blue and a something else.

In actual fact I have a brown, a black and a grey, which to my understanding is the colours for 3 phase. Where is the neutral wire?

While I know its probably not to regulations I intend to use the brown as a live, the black as a neutral and the grey as an earth. I'll tag the wires with the correct designations before they are terminated by a sparky.

I was just wondering why there appears to be no neutral wire in this cable?

Cheers

Steve
stevenc1603
Rank: Ganger
Progress to next rank:
99.3%
Posts: 199
Joined: Tue May 08, 2007 11:59 am

Sponsor

Simply Build It

Postby kuzz » Wed Nov 07, 2007 7:49 am

Because those were the colours that were agreed to replace our red yellow blue by Europe. Don't agree with it as now we find ourselves with a black neutral & a black live if adding to a three phase installation.

However Identify the cables with the correct colour sleaving as i'm sure your part p electrician will & no prob.
kuzz
Rank: Ganger
Progress to next rank:
56%
Posts: 134
Joined: Sat Nov 03, 2007 3:37 pm

Postby stevenc1603 » Wed Nov 07, 2007 1:32 pm

Cheers for that Kuzz,

I don't think we have Part P up here in Scotland, but there's bound to be something similar. Either way its the spark doing the termination of that bit anyway.
stevenc1603
Rank: Ganger
Progress to next rank:
99.3%
Posts: 199
Joined: Tue May 08, 2007 11:59 am

Postby sparx » Wed Nov 07, 2007 10:31 pm

Hi,steven,
IET [old IEE] state should use : brown as Live, Grey as Neutral[sleeved blue] And black{sleeved grn/yel.] as Earth. Idea being to break association between blk & N as in 3ph system is now a Live core colour.
The reason they don't make a brn/blk/grn/yel swa is they expect you to use a 2 core cable brn/blu with sheath as earth.
Most 3 core is used for balanced 3 ph circuits using swa as Earth [CPC to give its correct title] where no neutral used.
So limited call for 3core on single phase circuits.
(unfortunately some smaller sizes of SWA don't meet CPC requirements for disconnection times due to small amount of armouring around thin 2 core so no choice but your way) B,W, SPARX
sparx
Rank: Project Manager
Posts: 2166
Joined: Wed Mar 21, 2007 8:33 pm
Location: The fifth continent.

Postby stevenc1603 » Thu Nov 08, 2007 1:15 pm

Cheers for that sparx. I was aware that the outer wire armour was normally used as the earth, however as its feeding the summerhouse I wanted something a little better so went for the three core.
stevenc1603
Rank: Ganger
Progress to next rank:
99.3%
Posts: 199
Joined: Tue May 08, 2007 11:59 am

Display posts from previous
Sort by
Order by



  • DIY How to Project Guides

  • DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!



 


  • Related Topics