25mm swa armour for cpc

[Rockomuir]

Hi all,
Just planning a sub main to an outbuilding .
It will be 80 metre run, buried direct on a 63amp fuse .

So I am thinking of running 25mm swa but just been doing my calcs on whether I can use armour as Cpc. The outbuilding is going to be TT so no need of a bonding conductor on the submain.

After doing calcs in 2 core swa I get
99/51 x16 = 31.02

What I cannot find is csa of 25mm armoured to see if it is big enough .

If anyone could give me the answer it would be most appreciated

 

[oscar21]

Why do you need an earth/cpc if its powering a TT installation.

 

[Rockomuir]

Why do you need an earth/cpc if it’s powering a TT installation.

Sorry I might being completely daft. The swa is going to need a Cpc from the supply end but disconnexted at the outbuilding end as this will become TT. Just wanted to work out if 25mm armoured is big enough to use for cpc

 

[westward10]

The csa of the armour is around 42.0 for a two core 25.0 cable.