Check manual page of janitza_umg
Janitza Power Analyzer: Input phases
Monitors voltage, current, power, apparent power and energy on Janitza Power
Analyzers. This currently supports the devices UMG 604, UMG 508 and UMG 96
though others from the same line may be very similar.
The identifier of the phase ("Phase 1", "Phase 2", "Phase 3").
Creates three or four items - one per input phase.