To prepare harmonized standards for high-voltage power installations (exceeding 1 kV AC or 1.5 kV DC) located indoor or outdoor, including earthing. The standards will specify the design requirements of the installations, and the selection and erection of electrical equipment in order to ensure the safety of persons and the proper operation of the installations. The standards will not be applicable to factory built and type tested equipment, but will be relevant to the installation of this equipment. The standards will not be applicable to overhead and underground lines between separate installations.