We currently have two cabinets of equipment at our datacenter, and each cabinet is served by two 30A circuits. The facility is relatively new, and each circuit is (supposedly) redundant at the source.
Most of our equipment uses redundant power supplies, but some devices not deemed super important have been left without redundant power, so that our mission crit equipment can continue humming if we lost an entire circuit.
However, based on best guess (which includes accounting for a 20% redundant-to-non-redundant efficiency improvement based on some prior reading), two of the four circuits would probably be over the 80% mark in this scenario. Specifically, I would have estimated readings of 21A, 24A, 25.5A, and 28A.
Are loads such as these acceptable for a disaster scenario like this? I don't know what it would take to lose a redundant circuit, but I'm trying to plan for it.