Why can’t I output 120V from a 208V single-phase input?

Geist PDUs are high quality power strips intended to be used to distribute power to information technology equipment within a data center. These PDUs, which are available in single or three phase configurations, are not designed to increase or reduce the input circuit’s voltage level. Single-phase 120V rated power distribution units installed in North America will typically be powered by a 120V line-to-neutral circuit. The outlets on these PDUs will all be wired line-to-neutral and will output 120V. Single-phase 208V rated power distribution units installed in North America will typically be powered by a 208V line-to-line circuit. The neutral conductor is not connected to a standard 208V single-phase PDU; consequently, all outlets will be wired line-to-line and will output 208V.