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 transformer.
The __________ lead of the transformer secondary is normally fused and extended in the ladder diagram of the control circuit as the left-side vertical bus.
The __________ lead of the transformer secondary is normally grounded with direct connection to the equipment-grounding grid of the electrical-power distribution system (metal enclosure of the motor-control center) and extended in the ladder diagram as the right-side vertical bus.
A) X1; X1
B) X2; X2
C) X2; X1
D) X1; X2
Show Answer
Answer:D
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