Improvements made to Motor Circuit Calculator

I made some improvements in the checking of inputs to reply with alert messages. The maximum overcurrent device is 6000 amperes by 240.6(A) but for some larger motors this value is exceeded. I also dressed up the motor nameplate input to test for illegal variables and give alerts. While testing the outputs against the Ulgy's charts on pages 40 and 41 for three phase motors I found several errors in Ugly's. The conductor size for a 100 hp 460 volt motor should be 2/0 in place of 1/0. Also the conductor sizes in Ugly's are set for a No. 12 minimum while a No. 14 is sufficient in many cases. The small conductor size rules in 240.4(D) of the NEC do not apply to motor circuits. Also the Ugly's circuit breaker sizes do not follow the NEC rules for inverse time ciruit breakers. I do not know the rules they follow if there are any.

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electrician2.com

Motor circuit Calculator quality check

I have begun a thorough quality check of the motor circuit calculator. First I am checking all the NEC table entries in the program to make sure they are correct. Next I am creating an Excel Spreadsheet that duplicates many of the critical calculations. Then I plan to check the calculator against the spreadsheet. This project will take several weeks. Quality control is a major time consuming process with computer programs and is probably why so many programs require that you sign a no fault agreement before using them. Quality control and quality assurance are obiviously major expenses for large software corporations, but give the small guy an advantage. Small guys can always call it a "beta copy" and hope for the best.
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electrician2.com