Hioki CM4002, Instruction Manual

Page: 47 / 104

39
Measuring Leakage Current
Single-phase 3-wire circuit
• If the insulation on the wire has deteriorated at location A in the figure, you can detect the leakage current
through the measurement by clamping around bundled wires, not at location 3 but location 2 .
• If the insulation on the load device has deteriorated at location B in the figure, you can detect the leakage
current through the measurement by clamping around the bundled wires, not at location 5 but location 4.
A
2
1
3
4 5
B
Ig Ig:
Leakage current
PE
Load device Load device
Circuit breaker
HIOKI CM4002A961-02