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  1. MartyCoyne is offline Junior Member Pro Subscriber
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    NETA IV TEST

    I took the NETA IV exam this Monday. There was maybe one or two questions from this entire site on the exam!!!

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    Quote Originally Posted by MartyCoyne View Post
    I took the NETA IV exam this Monday. There was maybe one or two questions from this entire site on the exam!!!
    How did it go? Do you have any info to share?

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  5. MartyCoyne is offline Junior Member Pro Subscriber
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    Quote Originally Posted by ejbrewer View Post
    How did it go? Do you have any info to share?
    I don't remember a lot of questions but I will post as they come back to me!!

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    Quote Originally Posted by MartyCoyne View Post
    I don't remember a lot of questions but I will post as they come back to me!!
    1000kva 34.5kv to 480v secondary transformer 5% imp. apply 480v to primary side and short secondary to ground. What is primary fault current?
    Last edited by MartyCoyne; July 12, 2018 at 06:20 AM.

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    Quote Originally Posted by MartyCoyne View Post
    1000kva 34.5kv to 480v secondary transformer 5% imp. apply 480v to primary side and ground secondary. What is primary fault current?
    8.1A?

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  11. MartyCoyne is offline Junior Member Pro Subscriber
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    Quote Originally Posted by Lestracy31 View Post
    8.1A?
    1000000/34500*1.732=16.73a
    34500*.05=1725v
    480 is to 1725 as X is to 16.73
    480/1725=.2782 .2782*16.73=4.65a pri

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    Quote Originally Posted by MartyCoyne View Post
    1000000/34500*1.732=16.73a
    34500*.05=1725v
    480 is to 1725 as X is to 16.73
    480/1725=.2782 .2782*16.73=4.65a pri


    thx forgot sqrt3 in my Ibase calculation

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    Quote Originally Posted by MartyCoyne View Post
    1000kva 34.5kv to 480v secondary transformer 5% imp. apply 480v to primary side and ground secondary. What is primary fault current?
    Assuming D-Y

    Turns Ratio 34.5k to 277 = 124.5:1
    Sec. phase voltage at 480 primary = 3.86V
    Line Voltage from 480 primary = 6.68V
    1,000,000VA / (1.732*6.7V) = 86.4kA
    Secondary SC Current = 86.4/.05 = 1,729kA
    Primary Current = 1,729,000 / 124.5 = 13.88kA SC

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    Quote Originally Posted by MartyCoyne View Post
    I took the NETA IV exam this Monday. There was maybe one or two questions from this entire site on the exam!!!
    The exams are all being rewritten to be more challenging as well as more fair in the information being tested. Ambiguous and "trick" questions (and the answer choices) are being eliminated. While I have not taken any of the practice questions on this site, I am going to assume that the questions are similar, not verbatim from previous exams. Obtaining a passing score on any of these NETA exams will require the ability to apply your industry knowledge and experience, not just rote memorization.

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