Panasonic KW9M User Manual page 18

Three-phase four-wire system
*3 CTs are needed to measure three-phase four-wire system.
Vn terminal should be connected to N-phase which is grounded.
◆When measuring a load with exceed input voltage
Voltage transformer (VT) is needed when you measure a load with over input voltage.
Use a VT, those secondary voltage rating is 110V.
Grounding the secondary side of VT and CT is not necessary with low-voltage circuit.
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