As shown in figure "B" of the illustration,...

Question 1 / 270705eccefa4bacbc34ba4d483e5

Question 1 of 270705eccefa4bacbc34ba4d483e5

As shown in figure "B" of the illustration, what is the appropriate action to take? See illustration EL-0044.

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Question 1 of 27070

As shown in figure "B" of the illustration, what is the appropriate action to take? See illustration EL-0044.

If the question has a related picture, it will appear here.

🔍 Key Concepts

• Insulation resistance trending over time (look carefully at the plotted megohm values from 2005–2010) • Difference between an acceptable minimum insulation resistance and a rapidly deteriorating trend • How a sudden sharp drop in megger readings affects maintenance planning for a motor

💭 Think About

• Compare the 2010 megger reading with the earlier years: is the change gradual or sudden, and what does that usually indicate about insulation condition? • Even if a reading is still above a common minimum value, what does a strong downward trend tell you about future reliability and risk of failure? • Ask yourself whether simply testing more often solves the underlying problem, or whether a different kind of action is normally planned when a big drop occurs.

✅ Before You Answer

• Verify the numerical value of the 2010 insulation resistance on the chart and how many times lower it is than previous readings. • Check whether the earlier readings were relatively stable and all in the same general range, compared with the 2010 point. • Decide whether a prudent engineer would focus on increased monitoring, no action, planning refurbishment/replacement, or expecting many more years of life when seeing this kind of sharp decline.

Question 1 of 27070

As shown in figure "B" of the illustration, what is the appropriate action to take? See illustration EL-0044.

The motor should be meggered more often as the result of the 2010 megger reading.

No concern should be given, as the motor winding insulation resistance reading is still acceptable even based on the 2010 result.

Preparations should be made either to refurbish or replace the motor in question based on the 2010 result.

Another 5 years of service life can be anticipated prior to having to refurbish or replace the motor based on the 2010 result.

Question 1 / 270705eccefa4bacbc34ba4d483e5

Question 1 of 270705eccefa4bacbc34ba4d483e5

As shown in figure "B" of the illustration, what is the appropriate action to take? See illustration EL-0044.

Back

Question 1 of 27070

As shown in figure "B" of the illustration, what is the appropriate action to take? See illustration EL-0044.

If the question has a related picture, it will appear here.