If it's not constantly pulling more than the 13 amps it should be ok, so long as the socket's sound and you use good quality extensions. (So I'm told bya sparky). But surge protectors are a good idea...

I'm getting worried though, 'cos the rating all on mine is getting damn close to 13amps. but they don't normally pull the full amount they're rated at...

Soon as I can buy a house (Hahahaha yeh right) I'm gonna get a 30amp ring put it for my kit.