sub main cable calculation?

[urchy107]

morning all, im putting a sub main to another db in domestic property currently fed by single insulated 10mm tails. my question is the board will be supplied by a 63 amp breaker and is a 10m run so 10mm t&e was what I was going to use, but after a rough max demand calculation would state I need 16mm after doing a cable calc but obviously its still only gonna be supplied by a 63 amp breaker. I will do a proper max demand calculation which im sure will bring it down. or im thinking I could run an armoured so it wont need to on a rcd and take more but would mean jiggling the board around and increasing breaker. I have never had problems with a sub main on a 63?
If anyone could advise me it would be much appreciated.
cheers

 

[Amp David]

First of all whats the demand going to be at this new board? Get that sorted then design your circuit to suit.

IMO T&E isn't the best way to go for sub mains, a little rhinestone cowboy for my liking.:shame:

 

[urchy107]

why is it cowboy? it only runs the length of a double garage inside the building.