Assessment OICEW-3-1D

Measure insulation resistance

Assessed in EN-4231 Sea Term IV: Marine Engineering


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

Performance Requirements

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

Measure motor insulation resistance at motor controller

Use megger to perform insulation spot test:

  • de-energize motor, lockout/tagout if necessary
  • verify megger ground connection
  • connect lead to field winding
  • energize meter
  • read meter

Correct insulation resistance measurement to standard temperature.

Correct reading to 40 °C using nomograph or correction chart.

Evaluate insulation resistance value

Compare corrected resistance to IEEE standard.

State whether resistance value is within acceptable limits

Supports Table A-III/1 officers in charge of an engineering watch

Competence Knowledge, Understanding & Proficiency Task

Maintenance and repair of electrical and electronic equipment

B2.3 Detection of electric malfunction, location of faults and measures to prevent damage

Measure insulation resistance

Published: 2016-10-28-04:00