This National Standard of Canada is based on International Standard CEI/IEC 1264:1994. 1 General 1.1 Scope This standard applies to hollow insulators made of ceramic metarial, with their
fixing devices, intended for use with a permanent gas pressure greater than 0,5
bar having an internal volume equal to or greater than 1 litre (1 000 cm³).
They are intended for use in electrical equipment operating on alternating
current with a rated voltage greater then 1 000 V and a frequency not greater
than 100 Hz or for use in direct current equipment with a rated voltage greater
than 1 500 V. The hollow insulators covered by this standard consist of hollow insulator
bodies, open from end to end, with or without sheds. Note 1 - The gas can be: dry air, inert gases, eg, sulphur hexafluoride
nitrogen, or carbon tetrafluoride, or a mixture of such gases. Note 2 - The hollow insulators are intended for use in electrical equipment,
for example: - Circuit-breakers, - Switch-disconnectors, - Disconnectors, - Earthing switches, - Instrument transformers, - Surge arresters, - Bushings, - Cable sealing ends. This standard supplements, and modifies if necessary IEC 233 which applies to
the body of hollow insulators. 1.2 Objet The object of this standard is: - to prescribe design rules, - to prescribe test procedures and test values, - to define terms used, regarding pressure and bending stresses for hollow insulators covered by scope
1.1. It is not the object of this standard to prescribe dielectric tests, because the
withstand voltages are not characteristics of the hollow insulator itself, but
of the apparatus of which it ultimately forms a part.