I too have x4 S9's that I am planning to hook up when they are delivered at the end of the month. I ordered the APW3++ PSU for each S9.

I will be running these in a cold (50F) basement over the winter. My plan was to hook them up to a 30AMP circuit formerly used for a clothes dryer. If I cannot safely hook up to a 30AMP breaker, I will have an electrician install a 40AMP breaker for the antminers. My questions are, what PDU will I need to buy if I am using a 40AMP breaker? If I can use the 30AMP circuit, what PDU should I get? I really only need 4 ports in the PDU @ 220V.

Please advise and thank you in advance!