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Thread: Mike Holt Electrical Exam Prep Question 2017

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    Mike Holt Electrical Exam Prep Question 2017

    I am studying for my masters using the 2017 electrical exam prep book.

    I am confused about the two examples on page 272. Specifically, how was the size
    of the neutral determined for the Feeder calculations? Figures 6-71 and 6-72.

    After reviewing 215.2A and 110.14C2 I am stumped on how the neutral can be
    less than 100% of the possible unbalanced loads.

    On the next page, figure 6-73, the
    neutral is sized in what I think is the correct fashion.

    Any help appreciated.

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    Mike sells his products on his website. This forum can be accessed from his website but we (forum members & mods) have no way of looking at the material. So we can't help with your problem/question unless you post a copy of what you are talking about.

    I would suggest you contact the staff at Mike Holt's office. They will be able to help you with their material. Some years ago I used some of his material for exam prep and had to contact them a few times. They were always helpful with whatever I asked.
    If you aim at nothing, you will hit it every time!

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    He did not talk about the actual neutral load calculation in those two figures. He just said the neutral was sized at 100% of the neutral load. With the information given, there is no way to actually calculate the neutral load. You have no way of knowing how many 3 phase, line to line loads are being served by that panel. i believe that the point he is making there is that for continuous loads, you have to size the ungrounded conductors at 125% of the load, but the neural is sized at 100%.
    Don, Illinois
    (All code citations are 2017 unless otherwise noted)

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    Quote Originally Posted by don_resqcapt19 View Post
    He did not talk about the actual neutral load calculation in those two figures. He just said the neutral was sized at 100% of the neutral load. With the information given, there is no way to actually calculate the neutral load. You have no way of knowing how many 3 phase, line to line loads are being served by that panel. i believe that the point he is making there is that for continuous loads, you have to size the ungrounded conductors at 125% of the load, but the neural is sized at 100%.
    thank you very much. I was confused.

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