Leakage current measurement

Single-phase 3-wire circuit

3-phase 3-wire circuit

Other circuits

  • 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.

IMPORTANT

  • The instrument can momently display large a readout when you open and close the jaws; however, this is not an error.

  • The instrument cannot accurately make measurements in the following cases:

    1. (1)

      A large current flows through adjacent wires.

    2. (2)

      Special waveforms, such as that flowing through the secondary side of the inverter, is measured.

    3. (3)

      The jaws close incompletely. (In particular, if the external dimension of the object under measurement is large, such as when the instrument is clamped around three-phase wires together in a bundle, make sure that the jaws are closed completely. If the jaws are even slightly open, measured values will include errors and the accuracy cannot be ensured.