As shown in Fig. 12.72, a three-phase four-wire line with a phase voltage of 120 V rms, with a positive phase sequence, supplies a balanced motor load at 260 kVA at 0.85 pf lagging. The motor load is connected to the three main lines marked a, b, and c. In addition, incandescent lamps (unity pf) are connected as follows: 24 kW from line a to the neutral, 15 kW from line b to the neutral, and 9 kW from line c to the neutral.
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