BTW - I installed a 70A 120V circuit breaker in my main breaker box and ran two 20A dual-plug outlets. Each miner has each of its PSUs plugged into either outlet so that both miners are sharing both ciruits. Each circuit should be good for 20A * 120V = 2400W.
Pardon? What guage wire did you run? Are you implying that you ran both 'hots' to a single 70A breaker?