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Western Electrical Contractors Association (WECA) 103 Practice Test

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Which voltage pair is used to describe the dual-voltage capability of the single-phase pump motors?
Correct Answer:
115 / 230
Explanation:
Dual-voltage capability means a single-phase pump motor is designed to run on two voltages by wiring its windings differently. For these motors, the standard dual-voltage designation is 115/230 volts. When fed with 115 V, the windings are connected in parallel so each winding sees 115 V. When fed with 230 V, the windings are wired in series so the total voltage applied is 230 V. This lets the same motor operate from common US supply levels without changing the motor, just adjusting the winding configuration. The other voltage pairings shown are typical for different motor types or services (for example, three-phase motors or different service voltages), but they do not describe the dual-voltage labeling used for these single-phase pump motors.

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