Most control voltages, especially those rated at 120 volts, are derived as a separate electrical-power control system from the higher-voltage plant electrical-power distribution system through a control _________________.
The primary circuit of the control __________________ is normally connected to the branch-circuit supply for the motor(s) on the load side of the disconnecting means.
The secondary of the step-down, isolation __________________ is normally a single winding rated at 120 volts.
A) none of the answers
B) resistor; transformer; transformer
C) transformer; circuit; transformer
D) transformer; transformer; transformer
Show Answer
Answer:D
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