SWA armour sizes as CPC

Help Support Talk Electrician Forum:

Mr Sworld

Electrical Technician
Joined
Mar 21, 2008
Messages
1,152
Reaction score
0
Here is a good web page relating to SWA and the suitability of the armour as CPC.
 
Last edited by a moderator:

green-hornet

Distinguished Member
Joined
Feb 25, 2009
Messages
3,746
Reaction score
0
Link does not work I get an error 404.

Would be nice if it was repaired could be usefull info for some.

 

spinlondon

Distinguished Member
Joined
Apr 18, 2009
Messages
1,388
Reaction score
0
I thought that the point of using K was to establish the correct CSA for current carrying capacity.

 

spinlondon

Distinguished Member
Joined
Apr 18, 2009
Messages
1,388
Reaction score
0
But if you read it closely it was written for the 16th edition.
If you join the IET forum, you can ask John Peckham for his updated version.

 

musicspark

Senior Member
Joined
Mar 22, 2009
Messages
368
Reaction score
0
I thought that the point of using K was to establish the correct CSA for current carrying capacity.
Fine, but just out of curiosity what exactly is the current carrying capacity, in ampere,s of the steel wire sheath for the various sizes?

the link gives the CSA but you would need also the resistivity of the steel to get the capacity, would you not?

 

spinlondon

Distinguished Member
Joined
Apr 18, 2009
Messages
1,388
Reaction score
0
does this not involve money changing hands?
Not that I'm aware of.

John has mentioned a couple of times that if people PM him their Email addresses, he will send them a copy of his report. Recently he has offered the updated version.

 

spinlondon

Distinguished Member
Joined
Apr 18, 2009
Messages
1,388
Reaction score
0
Fine, but just out of curiosity what exactly is the current carrying capacity, in ampere,s of the steel wire sheath for the various sizes?the link gives the CSA but you would need also the resistivity of the steel to get the capacity, would you not?
There are two parameters to consider. The thermal withstand, which is what the k formula is intended to be used for.

Then there is the equivelant conductivity, to be determined for if the SWA is to be used as a bonding conductor.

The Table used in the link shows the minimum CSA required for the SWA using the K formula. It then shows the actual CSA of the SWA, which in the majority of cases exceeds the minimum.

Here is some reading material regarding the use of the SWA as a CPC.

http://www.wiley.com//legacy/wileychi/eca_wiringregulations/supp/Appendix_16.pdf

 
Top