How to calaculate the csa of the armour of a SWA cable

[pencilpusher]

When calcualting the minimum csa for a cpc using the adiabatic equation, how can you work out the csa of the armour of an SWA cable in relation to the amount of fault current it can carry?

 

[Richard Burns]

You need to know the csa of the steel and convert to copper equivalent csa and use that value in the adiabatic equation.
I think there are links to tables in various threads here
but this is one example.View attachment Conductors size v CPC pvc_xlpe.pdf