N+1
A component group or capacity arrangement with N units required for the declared design load plus one spare unit. N+1 describes provisioned capacity, not guaranteed tolerance of every failure or maintenance event or an availability outcome.
Current numbers
33 kWOCP ORV3 HPR power shelf output (6×~5.5 kW rectifiers; ~27.5 kW at N+1) onto the 48V busbar