Power supply to garden office question

[crussell1000]

Evening all.

I'm having a garden office installed next week. I work from home so will run a laptop and chargers, lighting, internet router, TV for playtime possibly with an xbox, a music player of some sort. All nothing major.

Now. Last year when I had my house rewired my sparky left a power outlet in the tool shed for me, fed from a 20Amp, rcbo at the board. The run from the out let to the office (so the SWA run) is a shade under 25m (allowing for a little extra flex both ends).

Question is...how many sockets can I go to on ring or radial?

I'll install a sub unit with two MCBs as the circuit is RCD protected at the board in the house.

 

[crussell1000]

Ah yea, true, so probably a shade over 18 amp (I rounded up on my previous figures) which with volt drop would put the 2.5 redundant.

So SWA three core direct from CU would be ideal.