Power Factor Correction Option:

The WSX series (96W and 135W families) switchmode power supplies are available with an option for power factor correction. At present UL, CSA, TUV and CE markings are not available in this configuration. Recent regulatory changes have appeared to negate the need for power factor correction in most non-consumer items. (see below)

EU Power Factor requirements for the CE Mark.

The situation at present is that the Jan 1st 2001 requirements have been relaxed by the modifications in IEC SC77A/WG1 and WG2 (see article 1). Class D devices are no longer defined by the "special waveform" requirements, but now only apply to television receivers and desktop computers.

Pertinent Articles:

1) EMC-Low frequency conducted emissions, J. M. Woodgate, August 2000
This article has detailed information on the specifics of the latest modifications to the IEC61000-3-2 conducted emissions (power factor) standard.

2) EN 61000-3-2 and EN 61000-3-3: Harmony at Last?, Gary Fenical, Sept. 2000
This article has more generalized information regarding the conducted emissions (power factor) regulations, and goes into the history of harmonic distortion in more detail.

Note:
EN61000-3-2 was amended by A14:2000, which is listed by OJEC, in December of 2000. Class D equipment is restricted to personal computers, monitors and televisions.