This Malaysian Standard provides guidance on principles which can be used as the basis for determining the requirements for the connection of distorting installations to mega voltage (MV), high voltage (HV) and extra high voltage (EHV) public power systems (low voltage (LV) installations are covered in other Malaysian Standards). For the purposes of this standard, a distorting installation means an installation (which may be a load or a generator) that produces harmonics and/or interharmonics. The primary objective is to provide guidance to system operators or owners on engineering practices, which will facilitate the provision of adequate service quality for all connected customers. In addressing installations, this standard is not intended to replace equipment standards for emission limits.