1.1 This standard covers the requirements of insulating shrouds, weather shields and containers made of ceramic material and applies before any metal fittings are attached to them. These components are collectively referred to in this standard as hollow insulators. They are intended for use in electrical equipment operating on alternating current at a frequency not greater than 100 Hz or direct current.
1.1.1 A hollow insulator consists of a single insulating element or of several parts permanently joined together.
Note 1 — The hollow insulators covered by this standard consist of hollow bodies, open from end to end with or without sheds, intended for use in electrical equipment such as of the following types:
a) Instrument transformers,
b) Lightning arresters,
c) Capacitors,
d) Bushings,
e) Cable sealing ends,
f) Circuit-breakers, and
g) Cable sealing boxes.
Note 2 — Hollow insulators are characterized by their shape and the dimensions given on the relevant drawings.
IS 5621-1980 history
1981IS 5621-1980 Specification for hollow insulators for electrical equipment