powerzx1 is a read-only integer (0 to 6240) reporting the real power consumption in Watts on the ZX leg of branch 1 on the Unity PDU. This gives an admin a direct wattage figure for that specific leg of branch 1, which is what actually matters for capacity planning against the branch's rated limit rather than inferring load from current alone. For example, an admin tracking growth in rack power demand would watch powerzx1 over time to decide whether branch 1's ZX leg is approaching the point where new equipment should be moved to a different branch.