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?

Correct Answer: Option D — 5000 V megger

IEEE 45 and standard marine electrical practices dictate that insulation resistance testing for high-voltage equipment (4160V) requires a test voltage significantly higher than the operating voltage to ensure dielectric integrity. A 5000V megohmmeter is the appropriate tool to stress the insulation and detect potential weaknesses or moisture ingress.