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Terminating SWA in a Consumer Unit


 
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elfreddo

from United Kingdom

Joined: 04 Nov 2004
Posts: 28
Location: United Kingdom

PostPosted: Mon Nov 22, 2004 7:19 am Reply with quote

Thoughts Please,
I'm about to install a 20A radial circuit to an supply an extension.
For the ease of installation the feed will come directly from the CU and be run though the garage wall in 2.5mm 3 core swa to a plastic termination box (ip56) on the extension wall. From here the it will be terminated using 2.5 T&E to feed the necessary power outlets inside.
My query is what is the best way to terminate the SWA to take the tails in the CU.
Cheers
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dw3101

from United Kingdom

Joined: 19 Aug 2004
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Location: Leeds,
United Kingdom
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PostPosted: Mon Nov 22, 2004 10:35 am Reply with quote

You sound like you dont know what you are doing and the cable sizes dont sound correct.

If you are adding an additional consumer unit I would use larger cable circa 10 - 16mm. You can terminate the gland directly into a metal clad consumer unit.

The other end should be terminated into a metal clad switch fuse which you can then run the tails from, or teminate into an adaptable box and then run 10mm T&E or similar to the existing consumer unit.

David
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elfreddo

from United Kingdom

Joined: 04 Nov 2004
Posts: 28
Location: United Kingdom

PostPosted: Mon Nov 22, 2004 4:10 pm Reply with quote

Let me explain further,
The power for the extension will be supplied from a spare 20A mcb in the existing cu (in the garage) This will then be run in the form of a radial. Because the cable has got to go outside for 5 meters then back into the extension I was going to use SWA instead of 2.5 t&e run in conduit.
Should i terminate the swa in a plastic or metal adapable box and how?
Cheers
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ban-all-sheds

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PostPosted: Mon Nov 22, 2004 4:53 pm Reply with quote

elfreddo wrote:
Should i terminate the swa in a plastic or metal adapable box

Yes, as you'll find it very hard to teminate it directly in the CU, they are usually too crowded. And, if plastic, too flimsy. So use a box - metal is best.

Quote:
and how?

With a SWA gland, of course, just as you would have done if you were terminating it in the CU....
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Paul_C

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PostPosted: Mon Nov 22, 2004 6:29 pm Reply with quote

A galvanized or black enamel 3 x 3" adaptable box with 20mm knockouts is ideal for this purpose. You can terminate the SWA with a 20mm gland into the box, then run T&E to it from the panel.
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securespark

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PostPosted: Mon Nov 22, 2004 7:22 pm Reply with quote

What I do with insulated CU's is as follows:

I terminate the SWA into a galv through box, making sure the tails are plenty long enough to reach the CU terminals required.

Then I fix the through box to the CU: Having drilled a suitable hole, I fix the galv box to the cu with a bush. All that then remains is to wire the conductors up to the CU and run an earth tag to the galv box, not forgetting a lid!

I prefer this method, especially for larger circuits, as you don't have to join T & E to the SWA (another unwanted junction).

Of course, some CU's are not suitable for this method, as you cannot remove the lid once the galv box is fixed.......
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ban-all-sheds

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PostPosted: Mon Nov 22, 2004 8:58 pm Reply with quote

securespark wrote:
Of course, some CU's are not suitable for this method, as you cannot remove the lid once the galv box is fixed.......

Use a bit of conduit instead of a bush?

If you use the flexible stuff you'd have complete freedom regarding the relative positions of box & CU.

Note to anyone reading this thread - this technique is for 3-core SWA, not 2....
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plugwash

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PostPosted: Mon Nov 22, 2004 10:12 pm Reply with quote

also depending on how long this run is you might want to run something a bit bigger than 2.5mm
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