Monday, March 13, 2006

More work needed for Motor Circuit Calculator

After reviewing the issues I must criticize my calculator. It does not give enough information. It should also provide the disconnect, equipment grounding conductor, raceway, and controller sizes. Also a summary with a graphic is needed to show the various components and sizes for a motor circuit. If only one size conductor were used for each motor this would be a simple technique of making up a table and then extracting the information. However, since the calculator determines size of conductors based on several variables the calculation method must be used. This can become very involved since the raceway fill calculator alone is 85k in length. So I may leave out the raceway size and make that another operation altogether. I spent most of the day again adding features to the calculator. Today I added the maximum allowable branch circuit ground fault and short circuit device sizes.

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