IEEE 519 is a system (i.e. facility) standard and doesn't apply directly to products like drives. IEEE 519 lists the maximum amount of harmonics a facility would be allowed to have, back at the point of common coupling. For a quick review of IEEE 519 and Point of Common Coupling, check out this video: kzfaq.info/get/bejne/hMCafs923Zbahps.htmlsi=9_sYskIB1uqg0mdD&t=194 With that all said, I can say that the Ultra-low Harmonic drive covered in the above video, has current distortion levels (when measured at the input lugs of the drive) that are lower (i.e. better) than even the most stringent level of IEEE 519.