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Question 1 of 205eccefa4bacbc34ba4d4842c

Suppose it is desired to determine the integrity of the insulation of a 4160 VAC motor. What type of insulation resistance tester (megger) would be suitable?

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5eccefa4bacbc34ba4d4842c

Suppose it is desired to determine the integrity of the insulation of a 4160 VAC motor. What type of insulation resistance tester (megger) would be suitable?

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🔍 Key Concepts

• Insulation resistance testing guidelines for medium-voltage equipment (in kV range) • Relationship between rated line voltage of the motor and the DC test voltage of the megger • Why higher-than-rated test voltage is used, and what risk an excessively high test voltage might pose

💭 Think About

• First, convert the motor’s rated voltage from volts to kilovolts and think about the general rule of thumb for what DC test voltage is used on equipment in that kV range. • Compare each megger rating to the motor’s 4160 VAC rating: which options clearly seem too low to meaningfully stress the insulation, and which might be unnecessarily high? • Ask yourself: For typical shipboard/industrial practice, what approximate megger voltage range is normally paired with 4 kV-class motors?

✅ Before You Answer

• Verify the standard practice tables (such as IEEE or manufacturer guidelines) that suggest test voltages for 1–5 kV class equipment. • Check that the selected megger voltage is higher than the motor’s phase-to-ground voltage yet still within common recommended test limits. • Eliminate any options that would be obviously inadequate to reveal insulation weakness or so high that they could risk damaging otherwise good insulation.

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Question 1 of 205eccefa4bacbc34ba4d4842c

Suppose it is desired to determine the integrity of the insulation of a 4160 VAC motor. What type of insulation resistance tester (megger) would be suitable?

Back

Question 1 of 20

5eccefa4bacbc34ba4d4842c

Suppose it is desired to determine the integrity of the insulation of a 4160 VAC motor. What type of insulation resistance tester (megger) would be suitable?

No comments yet

Be the first to share your thoughts!

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

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed