As in single-phase panels:
To, to balance the load current of the 120-volt, 2-wire neutral loads between the three ungrounded busses in a 3-phase AC, 4-wire, 208Y/120-volt building or other-structure electrical-power distribution system, the phase rotation or arrangement of busbars in panels, switchboards, or control centers is by row bottom to top.
Three-phase panels contain three ungrounded bus bars, but only two columns of fused switches or circuit breakers: the phase rotation down the rows is actually phase A, phase B, and phase C in either of the two columns.
A) True
B) False
Show Answer
Answer:B
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