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Lightning Arrestor Ratings

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    Lightning Arrestor Ratings

    What rating lightning arrestor would be suitable for a 13800/7900V system?
    Your Answer: 15kV
    Correct Answer: 10kV

    There are two different ratings for 13.8 kV. How do you determine from this question which one they are looking for?

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    Quote Originally Posted by breny426 View Post
    What rating lightning arrestor would be suitable for a 13800/7900V system?
    Your Answer: 15kV
    Correct Answer: 10kV

    There are two different ratings for 13.8 kV. How do you determine from this question which one they are looking for?

    Click image for larger version. 

Name:	table-2-arrester-rating-selection.jpg 
Views:	4 
Size:	233.7 KB 
ID:	485
    The question includes line to ground voltage levels of 7900v. This means you wouldn't choose the delta or ungrounded rated MCOV arrestor ratings.
    Last edited by rofo42; December 2, 2020 at 03:56 AM.

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