The following loads are served by a balanced three-phase source:
Load 1: 18 kVA at 0.8 pf lagging
Load 2: 8 kVA at 0.8 pf leading
Load 3: 12 kVA at 0.75 pf lagging
The load voltage is 208 V rms at 60 Hz. If the line impedance is negligible, find the power factor of the source.