Panasonic KW4M User Manual page 24

②Single-phase 3 wire system / Three-phase 3 wire system
*Two CTs are required to measure Single-phase 3-wire / Three-phase 3 wire system.
2) When measuring load with 200V or more system
VT (Voltage transformer) is needed when you measure a load with voltage over 200V system.
Use commercial VT, those secondary rating is 110V.
*Grounding CT's secondary side (l line) and VT's neutral line is recommended for the unit protection
when CT or VT breaks down.
① Single-phase 2 wire system
②Single-phase 3 wire system / Three-phase 3 wire system
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