Wiring Diagrams - Panasonic KW2M-A User Manual

3.4 Wiring Diagrams

Please connect a breaker or a fuse to the power supply and voltage input part for safety reasons and to
protect the device.
･Recommended breaker: 3 to 15A (IEC approved or UL Listed)
･Recommended fuse
Grounding the secondary side of VT (Voltage transformer) and CT (Current transformer) is not
necessary with low-voltage circuit.
*When using several CTs, set each CT approximately 1m apart. If the two CTs are set too close each
other, it may not measure accurately due to magnetic field interference.
◆When measuring a load with rated input voltage
Single-phase two-wire system
*One CT is needed to measure single-phase two-wire system.
*2 CTs are needed to measure 2-circuit and 3 CTs are needed to measure 3-circuit.
*To measure 2-circuit, wire 1 and 3. To measure 3-circuit, wire 1 and 3 and 5.
Single-phase three-wire/Three-phase three-wire
*2 CTs are needed to measure single-phase three-wire system, three-phase three-wire system.
*4 CTs are needed to measure 2-circuit.
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: Time-lag fuse rated current 2A (IEC approved or UL Listed)