A lot of my buyers have been asking the best way to power these units. I'm not an electrician. This is not electrical advice. I'm just giving you some general information. Please consult with a licensed electrician about powering your units at your specific location.
Your going to want to run these units off of single phase power.
For the purposes of this post, I'm going to use numbers from the Bitmain S19 Pro Antminer. These units run at about 3250 watts. If running on 220V Power, we can calculate the amps required by taking 3250 and dividing it by 220. 3250/220= 14.77 amps. So if you run two of these units on one breaker, you'll need at least a 30 Amp breaker to run 2 units at about 90-95% clock. Make sure the gauge of the wire running to these 220 v outlets are large enough to pull the amps. That can be found with a simple google search.
The best way to power these units for a small scale operation is with a PDU. You want something like what is linked below. You can find better pricing and a better option that fits your needs. Just make sure it can handle the amount of amps you are trying to pull (about 15 amps per s19 pro).
If you have a larger scale operation, you should consider installing a sub panel.
Feel free to chime in with any more info you guys have. I just wanted to paint a basic picture of how these things should be powered.