What is a phasing meter used for?

What is a phasing meter used for?

• A. To measure current in the line
• B. To monitor frequency
• C. To prove the phasing sequence hasn't been changed
• D. To test insulation resistance

Answer: (C)

Verifying phase sequence is what a phasing meter is for. It checks the order of the three-phase voltages to confirm the rotation direction of connected equipment remains as intended. When motors or other three-phase gear are wired or rewired, swapping two lines can reverse rotation, which can cause damage or safety hazards. The phasing meter quickly shows whether the sequence is correct and hasn’t changed, so you can be confident the equipment will start and run in the right direction. It isn’t used to measure current in the line, monitor frequency, or test insulation resistance. Those tasks require other instruments.

Verifying phase sequence is what a phasing meter is for. It checks the order of the three-phase voltages to confirm the rotation direction of connected equipment remains as intended. When motors or other three-phase gear are wired or rewired, swapping two lines can reverse rotation, which can cause damage or safety hazards. The phasing meter quickly shows whether the sequence is correct and hasn’t changed, so you can be confident the equipment will start and run in the right direction.

It isn’t used to measure current in the line, monitor frequency, or test insulation resistance. Those tasks require other instruments.