Powering Sub Board

[allybally]

Hi,I am on a job and at the moment there is a 10mm T&E powering a sub board in a flat downstairs, I am rewiring the whole house but this is the 1st time ive come across this, the Ze at the main board is 0.30 and im allowed 0.35, what size and type of cable would you run, a couple of the guys at work are saying 25mm 3 core swa, do you think this will be the case, im going to be powering this sub board from a 100A switch fused from a phase block, any suggestions would be much appreciated,

Many Thanks

 

[telectrix]

16mm with a 80A switch fuse should be adequate for a flat.

 

[sedgy34]

As above!!!

 

[allybally]

Hi, Thanks for the replies, I have already bought a 100a switch, will 16mm still be ok for this?

Many Thanks

 

[Knobhead]

What size is the incoming cut-out fuse? 100A max. Down rate the fuse in the switch to 60A and use 16mm. A flat doesn’t take that much even if a shower is fitted.

I’ll bet I could run my flat off a 16A fuse.