Revised Standard from Last Update.

NATIONAL FOREWORD

This Indian Standard which is identical with IEC 60273 : 1990 ‘Characteristic of indoor and outdoor post insulators for systems with nominal voltages greater than 1 000 V’ issued by International Electrotechnical Commission was adopted by the Bureau of Indian Standards on recommendation of the Electrical Insulators and Accessories Sectional Committee and approval of the Electrotechnical Division Council.

The text of IEC Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminologies and 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’.

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.