This read-only enumerated value reports the expansion cabinet's power supply status as OK(2) when either redundant supplies are healthy or a single supply is installed without error, non-critical(3) when redundant supplies report a fault, or unknown(5). An administrator monitors it for a storage expansion cabinet attached to the main Clustered RAID enclosure, distinct from the primary enclosure's own power status. A non-critical(3) reading would tell an admin one of the expansion cabinet's redundant power supplies needs replacement even though the cabinet is still powered.