And lets not forget that code (at least in commercial situations) is that breakers should not be loaded to more than 80% of their capacity on a continuous basis. So a 20 amp, 110V circuit (typically using 12 gauge wire) should not have more than 1760 watts of continuous load. Basically one S4/s7/s9 per 20 amp circuit. That limit is 1320 watts if your running with a 15 amp breaker (and typically 14 gauge wire). E.g. Your really pushing your circuits if your running an S9 at over 11.83THs. Maybe that is why they came out with that box? So it would, barely, fit on a typical US home circuit?
Here is what is at my wall........
https://s32.postimg.org/wtna3hz2t/PIC1.pngCan be run over 1760 you just better make sure you have hospital grade sockets and plugs on your extension cords. also make sure it is 10 gauge or thicker and everything will work fine as you can see been running it for over a week no burnt plugs or anything. I was getting that problem until I upgraded as mentioned above.
I have one S9 running and one S7-"ONE BOARD ONLY". No fires running for a week works well as long as you upgrade your ac plugs and sockets to hospital grade. standard sockets and plugs will burn up !
