Here's a couple of photos showing how I re arranged my miners. Four miners per rack. Each shelf has 2 X 1300W IBM server power supplies, both wired to a single switch fused spur. All four spurs (one from each shelf) wire back to a consumer unit with a 10A circuit breaker for each spur. Also a fifth breaker for a utility socket for each rack. Fed with a 3-Phase 400v circuit and a neutral to give me 230v.

It's 3-Phases with four outlets so each rack alternates the phase the 4 th outlet is on to maintain a balance.