The electrician reports to you that he has...

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Question 1 of 205eccefa4bacbc34ba4d483f5

The electrician reports to you that he has obtained low (but above 1 megohm) megger readings on the windings of a deck winch motor. Upon checking the records of that motor, you find the readings have consistently been at that level for the last six years. What should be your recommendation?

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🔍 Key Concepts

• Insulation resistance values and what is generally considered acceptable for low-voltage motors (order of magnitude, not exact number) • Trend of megger readings over time vs sudden change, and what that implies about motor condition • Difference between conditions requiring cleaning/drying/repair versus conditions that can be monitored and logged

💭 Think About

• Ask yourself: if the readings have been at the same level for six years without change, does that suggest an active developing fault, or a stable condition for that particular motor? • Which options (replacement, drying, cleaning, accepting) would normally be driven by a change in readings versus a long-term stable reading? • Think about what a megger actually measures (insulation resistance). Would moisture or dirt typically cause a sudden drop or a long-term unchanged value from commissioning onward?

✅ Before You Answer

• Verify what 1 megohm and above typically indicates for insulation resistance on shipboard machinery of this size/voltage class (in general training guidance). • Confirm whether there is any recent downward trend in the recorded values or whether they have remained stable over many years. • Consider standard shipboard maintenance practice: which recommendations would be disproportionate or premature if there has been no deterioration, only consistently similar readings.

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