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Mr Sworld

SWA armour sizes as CPC

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Mr Sworld
Here is a good web page relating to SWA and the suitability of the armour as CPC. Edited by Admin
Link UPDATED

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Apache

That should keep it safe and sound :)

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green-hornet

Link does not work I get an error 404.

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

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Apache

They must have updated the page

this is the link

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Andy™
They must have updated the page

this is the link

i didnt expect anything less that this reply Apache!

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septiclecky

But if you read it closely it was written for the 16th edition.

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Lee321
But if you read it closely it was written for the 16th edition.

the 17th did not ammend that regulation?

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musicspark

CSA is given but capacity is different for steel and copper

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spinlondon
CSA is given but capacity is different for steel and copper

Not quite sure what this statement means?

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Badger
Not quite sure what this statement means?

i think he may have meant resistance ;)

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musicspark

Current carrying capacity

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spinlondon

I thought that the point of using K was to establish the correct CSA for current carrying capacity.

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spinlondon
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.

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musicspark
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?

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musicspark
If you join the IET forum, you can ask John Peckham for his updated version.

does this not involve money changing hands?

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Apache
does this not involve money changing hands?

yes send me

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spinlondon
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.

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spinlondon
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

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septiclecky
If you join the IET forum, you can ask John Peckham for his updated version.

Already a member of the IET

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spinlondon

PM John and ask him to send you his updated version then.

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Andy™

and then post it on here for us who are not members of IET

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spinlondon

I would imagine that it's just the same as the 16th version, but with the Reg. and table Nos. changed.

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Risteard
does this not involve money changing hands?

You do not have to be a member of the IEE in order to use the IEE forum. That said membership is worthwhile.

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Admin

[quote name='Andy

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lkayelectrical

sorry know this is an old post but quick question

on there i noticed

10.It is dangerous to terminate both ends of the SWA

Why? i thought this was common practise (even glads are sold in 2's?)

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