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NETA Level 2 exam XFMR tables

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    NETA Level 2 exam XFMR tables

    9. What is the NETA Recommended Minimum Insulation Resistance value for a dry-type 4,160V-480V D-D transformer primary winding?
    Your Answer: 1 Gigohm
    Help: NETA Table 100.5 (2019)

    The answers were all in Gigs...1, 5, 10, 20. The cited table doesn't recommend anything beyond Megs...what am I missing?

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    Quote Originally Posted by Skoivisto View Post
    9. What is the NETA Recommended Minimum Insulation Resistance value for a dry-type 4,160V-480V D-D transformer primary winding?
    Your Answer: 1 Gigohm
    Help: NETA Table 100.5 (2019)

    The answers were all in Gigs...1, 5, 10, 20. The cited table doesn't recommend anything beyond Megs...what am I missing?

    1G would be for liquid filled.
    I would recommend understand the SI units prefixes too.
    Click image for larger version. 

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    Quote Originally Posted by Skoivisto View Post
    9. What is the NETA Recommended Minimum Insulation Resistance value for a dry-type 4,160V-480V D-D transformer primary winding?
    Your Answer: 1 Gigohm
    Help: NETA Table 100.5 (2019)

    The answers were all in Gigs...1, 5, 10, 20. The cited table doesn't recommend anything beyond Megs...what am I missing?
    5000 Megohms is 5 gigohms. For a dry-type transformer rated 601-5000V, minimum resistance is 5000 Megohms or 5 Gigohms

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    Quote Originally Posted by Skoivisto View Post
    9. What is the NETA Recommended Minimum Insulation Resistance value for a dry-type 4,160V-480V D-D transformer primary winding?
    Your Answer: 1 Gigohm
    Help: NETA Table 100.5 (2019)

    The answers were all in Gigs...1, 5, 10, 20. The cited table doesn't recommend anything beyond Megs...what am I missing?
    5,000 Megohms is 5 Gigohms .

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  9. archieb7 is offline Junior Member Pro Subscriber
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    Quote Originally Posted by Skoivisto View Post
    9. What is the NETA Recommended Minimum Insulation Resistance value for a dry-type 4,160V-480V D-D transformer primary winding?
    Your Answer: 1 Gigohm
    Help: NETA Table 100.5 (2019)

    The answers were all in Gigs...1, 5, 10, 20. The cited table doesn't recommend anything beyond Megs...what am I missing?
    5 Gig.

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