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I am doing an insulation test on 100 Ft of 5000A busway. What is the minimum megohm reading from phase to phase, phase to neutral, and phase to ground?

Regardless of the busway amperage, the minimum acceptable megohm reading is 100 divided by the length of the run in feet. (100 / feet). For example, if the busway run is 50 feet long, the minimum acceptable reading would be 100 / 50 = 2 megohms.

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