You are able to run twice as much hardware with 240 Volt verses 120 Volt.
The quantity of hardware you can run is based on the circuit's amperage, not voltage. Always double check that your circuit can supply enough amperage to support the attached devices, Watts = Amps x Volts.
Very true. I was once an electrician. I was on my way to certification but never did get certified. I quit just short of taking my test for my Journeyman's License.
I, by no means, am suggesting to turn a 15 amp (14 AWG) circuit into a 240 Volt 20/30/40 Amp Circuit. Is that what you took from my statements? I don't see this implication in my statements. If your statement was simply to inform them they cannot do what I just stated, then ignore my question wondering if that is what you gathered from my previous post. I was prepared to assist in letting them know what to do if they wish to hook up their rigs to 240 Volts. One can have 240 Volts on 20/30/40/50/60 Amp circuits. One could also have 240 Volt/15 Amp one poll breakers but that depends on the supplied voltage for each bar in the Main Panel. You and I both KNOW they do not have 240 Volt on one bar in their main panel at their house if they live in the U.S.
I was going to suggest Tandem breakers to make room for 2 poll 240 Volt breakers if they have no room in their Main Panel. Their Main Panel might be in a garage. If not, they might have an attic to run the proper wiring. It depends on the amperage they want or the length of the run, which would determine what gauge wire they would use. They may want PDU(s). They may prefer to make whips. Who knows?
I just don't know their situation. Hell, they might be in an apartment on the lower floor of a tall building. There was simply no need for me to go into details if they have no desire to gain access to 240 Volts. Some are just fearful of doing any electrical work at all. I've helped several in this thread [With no experience at all] via PM's to get going with 240 Volts for their rigs.
If your wiring is running through walls, you are not to exceed 70% to 80% of the circuits amperage. If your wiring is outside of walls and laying on a concrete slab with whips, you would be safe to run the circuit up to full amperage with the proper gauge wire. No where in the electrical code will you see a limit on how much you can run your main panel. If your main panel is a 200 Amp main panel, that is its limit (200 Amps). The limitation is placed on each individual circuit inside of walls or small conduit, not the main panel. Hence, the reason there are limits on how many circuits [Depending on the gauge(s)] can be in a particular diameter pipe and the material the pipe is made of [Rigid, PVC, Galvanized Steel, etc...]. There are just so many variables.
. I just wish there was more options on a 9 PCIE cord PSU. I think if I went to most computer store and told them I need 9 separate PCIe cords it would be funny to see response. Wonder how long of reading boxes before they say they don't have anything. 
