T&D World Magazine
Which Switch Goes to Which Motor?

Which Switch Goes to Which Motor?

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Norman, a new-hire electrician, has been sent out to rewire a control room in one of Hinterland Electric's oldest substations located in the foothills of the Northern Rockies where storms of one sort or another are a daily occurrence.

The frequently flooded substation has three sump pumps located about 150 feet from the control room, each with above ground 5 horsepower motors. The switches for the motors have long since lost their labels and the electrician that serviced the substation for the last 23 years has suddenly retired to a small island in the Caribbean and can't be reached. So Norman marks the switches 1, 2 and 3 and now his job is to figure out which switch goes to which motor. The simplest way is to turn on one switch at a time and go check to see which motor is running. But, as Norman is pondering the best way to proceed, a heavy rainstorm begins so Norman (always bright and innovative) comes up with a way to minimize his trips outside.

Can you do the same?

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