For example for a system with a current measurement uncertainty u of 1.2 %, the extended uncertainty with k=2 power factor will be: ± 0.022 for measurement from 0.9 up to 0.5 . ± 0.009 for measurement ...

Most applications that use power factor correction (PFC) are mandated by regulatory requirements like the IEC1000-3-2 harmonic reduction requirement in force since January 1, 2001.