Ive got 10 machines running off one double power point.. this was a single till i changed it over.
From memory - you are allowed 8 outlets on one circuit breaker... odd thing is that it is quite legal to have all these as 4 way sockets... then you run multi socket boards etc... your whole mains supply runs on the assumption that at no point do have everything cranking at full wack at one given point in time. Ive had parties ehere with every machine running, plus a smoke machine plus an oil wheel plus TV and PS2 etc... has never tripped yet