SWA joint the steel of a 2 core

[Cooper_day]

Hi everyone,

I have a 2 core 10mm2 SWA from a DB to a consumer unit to be joint. I know seems a silly question but how can I joint the steel of the SWA?

Thank you

 

[James]

Joint it to the dB or joint cable to Cable

 

[Cooper_day]

Understand. But I need to joint the steel from both the SWA for the earthing continuity.

 

[pc1966]

If you have to join cables mid-way then something like this has all the bits you need and is properly waterproof if you follow the instructions precisely:
https://www.cef.co.uk/catalogue/pro...-resin-joint-kit-for-cables-up-to-16mm-2-core

But usually you use the glands at the ends and avoid joints if at all possible.

 

[pc1966]

Understand. But I need to joint the steel from both the SWA for the earthing continuity.

Both at the DB? Use with a bond between the gland's banjos, or better still use the Earthing Nuts / Piranha nuts for attaching wires to the gland bodies.

https://www.cef.co.uk/catalogue/products/1522884-20mm-earthing-nut-sold-in-1-s

(Of course many better deals are available than CEF, but their web site is at least usable)

 

[Cooper_day]

If you have to join cables mid-way then something like this has all the bits you need and is properly waterproof if you follow the instructions precisely:
https://www.cef.co.uk/catalogue/pro...-resin-joint-kit-for-cables-up-to-16mm-2-core

But usually you use the glands at the ends and avoid joints if at all possible.

Thank you. The client wants to use this SWA(it is for temporary use)most likely to save money. However I have missed the green insulated conductor included in the kit which will give the continuity of the steel. Glands will be provided on both side.

 

[James]

More importantly, is the armour suitable for using as a cpc for your circuit design?

 

[pc1966]

Thank you. The client wants to use this SWA(it is for temporary use)most likely to save money. However I have missed the green insulated conductor included in the kit which will give the continuity of the steel. Glands will be provided on both side.

So the jointing kit is missing the earth link?

10mm 2-core has armour equivalent of 26mm steel = 3.25mm copper approx (6 ohm / km) so you would need some copper braid of roughly 4mm CSA as a replacement. Depending on the space available it might be a case of using 2 * 2.5mm stranded insulated wires, but you would need to be very sure it was making a proper connection when clamped.

 

[pc1966]

Just realised the 1st kit was for 10mm 3-core, this is the size they suggest for 10mm 2-core:
https://www.cef.co.uk/catalogue/pro...-resin-joint-kit-for-cables-up-to-10mm-2-core

 

[Rockingit]

More importantly, is the armour suitable for using as a cpc for your circuit design?

First thought that went through my head, too!

 

[DefyG]

Test for continuity of conductors/cpc BEFORE filling mould with resin, and of course afterwards.!

 

[loz2754]

I am reading the original post as "how do I connect the armour of the SWA to consumer unit, and also to the DB".

Answer - use the proper type and size of gland for the SWA cable, along with the supplied earth connection ring (banjo) bolted through the metalwork using brass bolts and nuts.

Or is it just me?

 

[pc1966]

Or is it just me?

No, I am still not 100% sure of the question!

But I think it was a joint kit missing the braided CPC link.

 

[DefyG]

Like PC1966 just said OP mentioned link missing so assumed it to involve a joint kit!! but could be wrong, its not very clear!

 

[littlespark]

I read the OP as

I have a 2 core 10mm2 SWA from a DB to a consumer unit to be joint.

and with a little imaginative spelling correction i get:

"I have a 2 core 10mm2 SWA from a DB to a Consumer unit to be JOINED"

So I think the suggestion of the torpedo joints with resin is right. Also the copper equivalent of the missing earthing link between the two armours.

 

[Cooper_day]

Thanks to everyone. It was very helpful. The client at the end brought up a 400m wooden cable druml of 3 core 10mm2 SWA!

 

[telectrix]

Thanks to everyone. It was very helpful. The client at the end brought up a 400m wooden cable druml of 3 core 10mm2 SWA!

what's the anticipated load. 400m is a long run. VD could be an issue.