Swa as cpc what size ?

[dnjr]

Dear all
Testing a garage that is fed in 2 core swa using the swa as cpc
Live and neutral are 2.5mm. I know the swa is fine as a cpc but I’m unsure what size to put on certificate for it
Seen a table that says it’s equivalent to 17mm but in the back of my mind I remember you need to divide by 8.8
So which goes on the very. 17mm or 1.93mm
Thanks in advance
Cheets

 

[westward10]

You are correct in saying the csa is 17mm and the 8.8 factor (there are other factors within the same ball park) gives its conductivity in terms of copper. Most people will just note swa in the column as opposed to a csa.

 

[dnjr]

You are correct in saying the csa is 17mm and the 8.8 factor (there are other factors within the same ball park) gives its conductivity in terms of copper. Most people will just note swa in the column as opposed to a csa.

Hi westward. Thanks for the reply( prompt as usual). I didn’t think I could put swa in the box of the cert. it’s the Niceic online cert and I think it needs a number so I guess I go with 1.9mm

 

[westward10]

Well the actual csa is 17mm as the other figure is its equivalent to copper in terms of conductivity.

 

[dnjr]

Well the actual csa is 17mm as the other figure is its equivalent to copper in terms of conductivity.

Doh
Yep there is a copper or steel box from memory so steel 17mm. Perfect. Thank you

 

[Risteard]

I use "ARM" instead of a numerical value.

 

[dnjr]

I use "ARM" instead of a numerical value.

Just tried ‘swa’ but Niceic cert online says it needs a number.

 

[Risteard]

Just tried ‘swa’ but Niceic cert online says it needs a number.

I don't use the online software but use the Clik software. You could try reporting it as a bug to the NIC.

 

[westward10]

Just tried ‘swa’ but Niceic cert online says it needs a number.

Computer says no

 

[davesparks]

Record the CSA in the box, it doesn’t ask for the ‘copper equivalent’ or calculated value, just the actual CSA.
If you had aluminium conductors would you calculate the ‘copper equivalent’ or just record the CSA?