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Experience:  33 years experience electrical troubleshooting industrial equipment and control systems.
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2. You are performing an insulation resistance test on a 480V,

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2. You are performing an insulation resistance test on a 480V, ungrounded, 3∅, Wye generator with a Fluke 1507 insulation resistance tester. From the choices below which one represents a good insulation resistance test?

a. A-B 50 MΩ, A-C 48 MΩ. C-B 51 MΩ
b. A-Ground 50 MΩ, B- Ground 52 MΩ, C- Ground 49 MΩ
c. A- Neutral 2 MΩ, B- Neutral 0 MΩ, C-Neutral 0 MΩ
d. All combinations above Infinite.

Craig :

The answer is : b

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