Earth Size etc?

[i=p/u]

So you can use the armour OF SWA IN DIS CIRCUIT AS bonding conductor if it is sized correctly, is there a table for this or can i see where this is and work it out for myself.. Maybe with help from yourself with my buts and whats, y

 

[ste77]

I have my own table, cant remeber where i got it from but it shows you the cross sectional areas of swa required as an earthing conductor along with what size is suitable and what isnt.

 

[Hobsoni]

So you can use the armour OF SWA IN DIS CIRCUIT AS bonding conductor if it is sized correctly, is there a table for this or can i see where this is and work it out for myself.. Maybe with help from yourself with my buts and whats, y

I'm getting confused here. If I was main bonding services in the extension I would be running a separate earth conductor from the MET............end of. Is it because the supply is to a DB and not a load that he is allowed to use the armour as a bonding conductor??

 

[ste77]

yes i would do it that way too, but ive seen the armour used as a bonding conductor when the csa is sufficient.

 

[Hobsoni]

yes i would do it that way too, but ive seen the armour used as a bonding conductor when the csa is sufficient.

And was the SWA feeding a load or DB?

 

[ste77]

Another DB. it was a large hotel extension with about a 100 metre run to the switchroom

 

[Hobsoni]

I'm relieved it was a DB. But like we both said, separate Earth for main bonding.............I wouldn't do it any differently regardless of what I've seen.

 

[Jay Sparks]

So you can use the armour OF SWA IN DIS CIRCUIT AS bonding conductor if it is sized correctly, is there a table for this or can i see where this is and work it out for myself.. Maybe with help from yourself with my buts and whats, y

Have a look at this.

View attachment SWA CSA COPPER EQUIVALENT.pdf

View attachment SWA CSA of Armour.pdf

 

[ste77]

yeah i agree. but you cant legislate for the way other people do things sometimes, especially when they dont do it the way you would do it and your trying to find a fault.

 

[ste77]

Have a look at this.

View attachment 17316

View attachment 17317

pretty much the same as the info i have. Theyve got the bs number wrong for pvc swa at the top of the page though.

 

[Guitarist]

Why the hell would he do that?? lol!!

Don't shoot the messenger. I was just interpreting the post....

 

[i=p/u]

So for my 16mm 5c swa as im not using swa as cpc i could use it as bonding conductor as it would be equivelent to 31mm copper

meaning i could run bonding to this board instead of back to met at service fuse?

Could i use armour as cpc and bonding conductor in this case

 

[ste77]

31mm copper? where did you get that figure?

 

[i=p/u]

16mm 4c swa = st 72 and cu 31.9

 

[ste77]

Apologies i was looking at the wrong table but i thought you were using 5 core?