Utilities shall make reasonable efforts to investigate equipment operating problems suspected to be associated with harmonic distortion of the 60 Hz voltage sinewave at the point of service. When the source of the harmonic distortion is determined to be equipment operated by a specific customer, the utility shall notify the customer and it shall be the customer's responsibility to correct the problem. When corrective action is necessary, the guideline to be used is the 1992 IEEE Standard 519.
Wis. Admin. Code Public Service Commission PSC 113.0704
See s. PSC 113.0201.