... operation 2.Lcd display 3.ISO Certificate Specification and Technical Data 2,Rated Voltage(V):Three-phase ... four wire)phase, uninfected measurement 4,Wide service temperature range 5,Assuming output of electric energy test signal ... 6,Two-line metering displays the active and reactive electric quantity Rated Current(A) 3x1.5 ... or 2 Three phase three wire electronic digital multi tariff kWh Meter,