Hioki CM4002, Instruction Manual

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36
Measuring Leakage Current
Three-phase 3-wire circuit
Ig: Leakage current
PE
Ig
Load device
PE
Measurement using ground wire:
Clamp around only one wire.
1, 4.
1
4
Measurement of zero-phase current:
Clamp around the wires together in a bundle.
2, 3.
2
3
Circuit breaker
Other circuit
• Clamp around two wires together in a bundle in the single-phase 2-wire circuit.
• Clamp around four wires together in a bundle in the three-phase 4-wire circuit. Even when the instrument
cannot be clamped, you can measure leakage current using the ground wire of the equipment instead.
HIOKI CM4002A961-02