powerFactzx1 is a read-only integer (-100 to 100) reporting the power factor, multiplied by 100, for the ZX leg of branch 1 on the Unity PDU. A power factor well below 100 on this leg signals that the connected equipment's reactive load is making the branch draw more apparent power than its real Watt consumption suggests, which matters for correctly sizing circuits and understanding utility billing. For example, if powerFactzx1 reads 65 for branch 1, an admin would know that leg's equipment mix (likely switching power supplies) is pulling noticeably out-of-phase current, unlike a leg reading closer to 95-100.