scope:

This Recommendation applies to insulating weather shields and containers made of ceramic material or glass and applies before any metal fittings are attached. These components are collectively referred to in this recommendation as hollow insulators. They are intended for use in electrical equipment operating on direct current or alternating current at a frequency not greater than 100 Hz. The hollow insulators covered by this recommendation consist of hollow bodies, from open end to end, with or without sheds, intended for use in electrical apparatus such as: instrument tansformers; lightning arresters; capacitors; bushings; cable sealing ends; circuit-breakers. A hollow insulator may consist of a single insulating element or of several parts permanently joined together. The object of this recommendation is: -to prescribe methods of test; to prescribe acceptance criteria. It is not the object of this recommendation to prescribe impulse voltage or power-frequency voltage tests, because the withstand voltages are not characteristics of the hollow insulator itself, but of the apparatus of which it ultimately forms a part.