Panasonic KW2G User Manual page 21

Single-phase three-wire system/Three-phase three-wire system
◆When measuring a load with rated input voltage
Two CTs are needed to measure one load.
Note)
(1) When wiring CT, wire correctly according to this, K for power supply side and L for load side.
(2) 2 CTs should be same.
◆When measuring a load with exceed input voltage.
Voltage transformer (VT) is needed when you measure a load with over rated input voltage.
Use VT, its secondary side rating is 110V.
Grounding the secondary side of VT and CT is not necessary with low-voltage circuit.
Power supply side
1 2
R N
R S
3
T
T
440V 110V
VT
12
KW2G / KW2G-H Eco-POWER METER
Breaker
P1 P0 P2