3 core SWA, black for cpc

[tigerpaul]

Now then, for a single phase circuit, using a 3 core SWA having brown black and grey conductors... I always think that you should sleeve the black with G+Y to use as earth, and sleeve the grey up with blue to use as neutral.

I cant find it in the regs or any of my other books, but I thought that was the correct way... as you were then de-neutralising the black.

Would doing it the other way (black sleeved blue for N, grey sleeved G+Y for earth) be against the regs, or just bad practice, or actually nothing wrong at all, as long as the ends were identified correctly..

??

 

[Spudnik]

There is no reg, apart from the one that states they should be identified as to their purpose.

It is good practice to use the black as the cpc, however, as it will be "relabelled" with sleeving, then it doesnt matter really.

 

[ian.settle1]

When the cable colours where first harmonised back in 2004 the NICEIC did release a pamplet with the title of deneutralising the black.

Which basically stating that the black should not be used as the neutral as used before harmonisation.

 

[m25maintenance]

warning lable

 

[lewlec]

hi

sorry.... a little off topic

i bought some 10.0mm 3core swa a couple of years ago and found it was brown, blue & green and yellow..... anybody seen that before? i aint

regard
gary

 

[confused-fuse]

niciec books all show black=cpc (green/yellow) tag gray=nutral brown=phase/line/live ..

i do have a some swa with cream/black/red but that was given to me about 7 years ago with warning lable SAMPLE

 

[Guest123]

hi

sorry.... a little off topic

i bought some 10.0mm 3core swa a couple of years ago and found it was brown, blue & green and yellow..... anybody seen that before? i aint

regard
gary

It is a bit rarer than the usual brown, black, grey, but is available. Had a job lot form CEF not so long ago for a street lighting job. It was harder to strip than the other coloured stuff too.

 

[pembo]

We were having this arguement a couple of months ago, and agreed that the black should be sleeved as mentioned above, so as not to be confused with the old neutral if installed in a mixed board.
17th just says it should be identifiable at termination points. The one thing i would stress is make sure you have agreed whatever you decide to use with the guy doing the other end of the cable. Its not so funny when they're glanded and dressed, then get picked up as crossed on the testing and have to be changed!
I was given fire damaged swa on a contract that had no separating powder in it, was a bugger to strip!

 

[ICE]

I agree with Brown Phase Grey Neutral and Black CPC, I put this to a coleauge who is a Member of the IET and he said why not just buy 2 core and use the SWA as the cpc. I enclose a copy of his paper that he produced about just this.

 

[tigerpaul]

Well written essay that, a 17th edition one would be perfect!