I have 2 Bitmain APW3-12-1600 PSU Series PSUs and I'm wondering what power input they need. I live in the U.S. and I've read that some people are running 220v input.  This PSU comes with a standard 3 prong plug. I have the electrician that we deal with at work coming out to install a new line for these, but I need to know what to tell him to put in since a 220v 30 amp circuit has a different plug, not the standard 3 prong.  What is everyone else using?  I'd like to get my S7s up and going! Thanks!