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If the IEEE 519 PCC (point of common coupling) is on the HV side of the transformer, why are we required to find solutions for harmonics at a motor 4 levels downstream, if there are no real issue?

IEEE519 is a general quide and applies at the PCC (where end user network meets Utility); Why it is applied to loads or secondaries of transformers? - cannot answer this question but many consultants go this route; a misapplication of the standard
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