For the sake of any of my fellow Europeans...
We run at 240V
In the UK, a standard "mains" circuit would have a 32A breaker, however a standard UK wall outlet is limited to 13A by means of a fuse within the plug of the device you are connecting.
13A at 240V gives us a single outlet maximum wattage of 3120W.
Putting that into context, that's *theoretically* 12 Line6 speakers on a single outlet
Right, so I've never actually pushed it that far, but I have run eight, plus the rest of our gear off a single, though I wasn't 100% happy about doing so.
My normal preference is to run a power line down each side of stage, each from a separate wall outlet/socket. The two sockets can be on the same ring without any issue, but I prefer two separate outlets.
Might seem a little OTT, but I really hate domestic "4 gang extensions" and the likes, so I have a complete customisable power-rig all interconnected with Neutrik Powercon couplers and a variety of different lengths of H07RN-F rubber outer 2.5mm core cables to interconnect the outlet pieces. I then have powercon boxes with UK socket outlets (3 with 6 each), powercon boxes with IEC outlets (2 with 10 each) and a variety of powercon splittershttp://kelseyacousti...ribution/floor/
The IEC powercon boxes were custom made for me by Kelsey.
I ban domestic power cables from our stage, and from the stage of any band I do sound for, and they all plug in to my power rig. Guys in the band with me think I'm mad, but the rig has never yet let us down!