GN8 9.3.1 Calculation of csa – armoured cable 118

[chris day]

Ordered GN8 not arrived yet

anyone got section 9.3.1 Calculation of csa – armoured cable 118 to hand

 

[Ian1981]

 

[buzzlightyear]

what are you building now ,time machine with the SWA .

 

[chris day]

Thank you for this chart Ian!!!!! Life saver honestly.

Such a usefull chart

 

[westward10]

You do realise you have to apply a factor to those if the armour is to support bonding to calculate its conductivity.

 

[chris day]

there are no requirements for supp or main bonding within the building supplied in question , SWA only used as a CPC on sub mains and not supporting main bonding.
But yes quite right i think its a factor of 6 or something?

 

[buzzlightyear]

what are you supplying regard's SWA sub mains.

 

[chris day]

its and existing installation supplying a brick building with just a few sockets and lights.
an 2 core SWA 50mm sub mains protected by a 80a BS88-2 fuse supply the fuse board in the outbuilding

 

[buzzlightyear]

its and existing installation supplying a brick building with just a few sockets and lights via a 30ma RCD unit

I that all ,the way you asking I thought you were supplying a sub station .

 

[buzzlightyear]

its and existing installation supplying a brick building with just a few sockets and lights.
an 2 core SWA 50mm sub mains protected by a 80a BS88-2 fuse supply the fuse board in the outbuilding

is it that old chestnut.

 

[chris day]

chestnut indeed

 

[Deleted member 26818]

there are no requirements for supp or main bonding within the building supplied in question , SWA only used as a CPC on sub mains and not supporting main bonding.
But yes quite right i think its a factor of 6 or something?

8 or 9 depending on the type of steel.