IS 9431 : 2024/IEC 60660 : 1999 Indoor Post Insulators of Organic Material for Systems with Nominal Voltages Greater than 1 000 V up to and including 300 kV - Specification
NATIONAL FOREWORD
This Indian Standard (First Revision) which is identical to IEC 60660 : 1999 'Insulators - Tests on indoor post insulators of organic material for systems with nominal voltages greater than 1 000 V up to but not including 300 kV' issued by the International Electrotechnical Commission (IEC) was adopted by the Bureau of Indian Standards on the recommendation of the Electrical Insulators and Accessories Sectional Committee and approval of the Electrotechnical Division Council.
The standard was first published in 1979 and the first revision has been undertaken to align it with the latest IEC publication.
The text of the IEC standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:
a) Wherever the words 'International Standard' appear referring to this standard, they should be read as 'Indian Standard'; and
b) Comma (,) has been used as a decimal marker, while in Indian Standards the current practice is to use a point (.) as the decimal marker.