Swa sheath size too small

[chris day]

an outbuilding is supplied by a 50mm twin SWA cable from a PME supply

The assessor has told me to convert to a TT as the steel csa is too small, is there a way I can prove that surely a 50mm twin swa sheath is suitable to be a 16mm earth?

 

[littlespark]

Looks like Pete gets "Top Poster Of The Month" award... just for trying to upload a file

 

[Wilko]

Hi - looking in GN8 tables B 1, 2 or 3 it has 50mm swa with steel of 68 (2 core), 78 (3 core) or 90 (4 core). For bonding it's the ratio of resistivity which is about 8. This means the steel armour is worth about 8.5, 9.75 or 11.25 mm2 of copper. The incoming DNO neutral may be bigger than 50, but even 50 needs 16mm (Table 54.8).

 

[westward10]

Looks like Pete gets "Top Poster Of The Month" award... just for trying to upload a file

53% of the posts.

 

[suffolkspark]

Keeps me entertained every few weeks theres just like 3 posts from pete with links to a file on his desktop that nobody can obviously access then he eventually figures it out..... Then forgets for next time

 

[PEG]

Keeps me entertained every few weeks theres just like 3 posts from pete with links to a file on his desktop that nobody can obviously access then he eventually figures it out..... Then forgets for next time

Leave him alone...you may need to know how to replenish a Le Clanche Jar,one day,and he'll not help you...

 

[nunthe wiser]

Had to google that, the cynic in me assumed it was a fancy name for a wine glass.

 

[chris day]

Is it supporting main protective bonding, if yes then it is inadequate.

it is supporting main bonding however i dont think it fair to say its smaller than 10mm.
i counted 20 strands of steel at 1.5mm diameter

 

[suffolkspark]

it is supporting main bonding however i dont think it fair to say its smaller than 10mm.
i counted 20 strands of steel at 1.5mm diameter

We don't take the size like for like bud, different conduncance, resistance, and other such magical properties between the 2 metals hence the tables the lads have linked you to

 

[westward10]

it is supporting main bonding however i dont think it fair to say its smaller than 10mm.
i counted 20 strands of steel at 1.5mm diameter

No it is inadequate, see #18.

 

[Pete999]

Keeps me entertained every few weeks theres just like 3 posts from pete with links to a file on his desktop that nobody can obviously access then he eventually figures it out..... Then forgets for next time

Old age mate you will get there one day if your lucky, I did try though, not going bother anymore if this round of pee taking is anything to go by, so you can all go jump in the river, I'll have you know I have a vast array of information in my resources file, all of which I will now keep to myself, mainly because I can't recall how to send them on this confounded computer thingamajig, so there, I'm off to sulk for a bit, see you later maybe.

 

[Pete999]

Yes it did mate.

Thank Spoon.

 

[telectrix]

never mind pete. first time i tried to cut and paste, i got slash marks on the screen and sticky goo on the keyboard. then i realised it wasn't about wallpaper.

 

[Pete999]

never mind pete. first time i tried to cut and paste, i got slash marks on the screen and sticky goo on the keyboard. then i realised it wasn't about wallpaper.

Not easy for us aged people is it Tel?

 

[Pete999]

http://www.earthingnuts.co.uk/pdf/pvc_xlpe.pdf

edit: Pete, you beat me to it!

Crikey that's a first.

 

[telectrix]

went on a training course yesterday. Risco Agility. it does everything bar making tea, but it's bloody complex to take in the programming side.