Aboard ship or in a workshop, given access to 3-phase electrical AC motor controller, a phase sequence indicator, and other proper tools and safety equipment.

Performance requirement

Behavior Standard
The student will: During assessment, the student shall, at a minimum:

Check phase rotation using phase rotation meter prior starting an ac motor

Use meter according to manufacturers instructions

Identify phase sequence on meter

Match phase sequence to motor rotation direction

Determine if phase rotation is correct for desired direction of motor rotation

Predict direction motor will rotate

Verify motor rotates in predicted direction

State how to reverse motor


Assessed in EN‑4231 Sea Term IV: Marine Engineering.


  1. Table A-III/1 OICEW-B2.4
  2. NVIC Task

See the Assessment Guidelines for additional specifications of behavior and standards.