NETA ETT Level 2 Practice Questions - NETA ETT Level 2 Certified Assistant Electrical Testing Technician Exam

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A 480 V motor is tested with a 1000 V DC insulation resistance test. One-minute reading is 150 megohms; 10-minute reading is 450 megohms. The Polarization Index (PI) is:

0.33 (inverted ratio R1/R10) 1.5 (below IEEE 43 good-insulation guideline) 3.0 30 (tenfold arithmetic error)

Correct Answer:

3.0

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