Practical values of power factor

Average power factor values for the most commonly-used equipment and appliances

(see Fig. L6)

Equipment and appliances			cos φ	tan φ
Common induction motor	loaded at	0% 25% 50% 75% 100%	0.17 0.55 0.73 0.80 0.85	5.80 1.52 0.94 0.75 0.62
Incandescent lamps Fluorescent lamps (uncompensated) Fluorescent lamps (compensated) Discharge lamps			1.0 0.5 0.93 0.4 to 0.6	0 1.73 0.39 2.29 to 1.33
Ovens using resistance elements Induction heating ovens (compensated) Dielectric type heating ovens			1.0 0.85 0.85	0 0.62 0.62
Resistance-type soldering machines Fixed 1-phase arc-welding set Arc-welding motor-generating set Arc-welding transformer-rectifier set			0.8 to 0.9 0.5 0.7 to 0.9 0.7 to 0.8	0.75 to 0.48 1.73 1.02 to 0.48 1.02 to 0.75
Arc furnace			0.8	0.75

Fig. L6: Values of cos φ and tan φ for commonly-used equipment

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