Armoured Cable Size

[Echo the husky]

Just a note, it would be a HUGE waste of money and very short sighted buying and installing a cable that is too small for the job, just because it is cheaper. The extra cost of a bigger cable is insignificant when you account for how long it will be there, and the spare capacity will allow future extensions or additional equipment to be used. Having to dig another trench and install another cable next year when you need to run more than one thing at a time, is vastly more expensive!

 

[Taylortwocities]

I completely agree. For that distance I would be installing 25mm². The power requirements for stable outbuildings always grow with time.
Later you might want to floodlight that ménage, or have a horse walker. All sorts of options.

 

[ban-all-sheds]

If I ran 10mm cable, this would save about £200 but what load would this take?

FGS

http://www.tlc-direct.co.uk/Technical/Charts/VoltageDrop.html <- Specify 2-core cable and PVC, even if that is not what you are using or it will make invalid assumptions.

 

[Lectrician]

£200 ain't a lot these days......do it right!