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Type: Posts; User: jonnytsa

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  1. Replies
    13$$
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    1,646

    Derating calculation problem

    In the mike holts study master contractor practice exam they derate 10awg @ 70% with 8 current carrying conductors thhn for 21A loads on 30A breaker.

    90° thhn 10awg is 40A x 70% = 28A. they say...
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    3$$
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    table 220.55 notes

    I'm doing calcs for multiple ranges on a study guide. Notes 1-4 on table 220.55 say to increase 5% each additional kilowatt of rating "or major fraction therof".

    I have a question. Is a major...
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    2$$
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    1,804

    I'm a big fan of the mike holt books. The books...

    I'm a big fan of the mike holt books. The books are much cheaper than the videos if you can handle studying the traditional way. The electrical exam preparation book has all the calculations info. ...
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