Single-phase AC electrical-power distribution systems operating in buildings or other structures are normally rated 3-wire at 120/240 volts.
The connected loads can be supplied as a 2-wire branch circuit at either __________ volts the ungrounded supply and a common grounded return neutral conductor; or at __________ volts ― the ungrounded supply and return conductors, or as a 3-wire branch circuit with both voltages.
A) none of the answers
B) 240 ; 120
C) 120 ; 240
D) 100 ; 240
Show Answer
Answer:C
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