(Superseding IS 3188 : 1980)

NATIONAL FOREWORD

This Indian Standard (Part 2) which is identical with IEC 60383-2 : 1993 ‘Insulators for overhead lines with a nominal voltage above 1 000 V — Part 2: Insulator strings and insulator sets for a.c. systems — Definitions, test methods and acceptance criteria’ 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.

This series consists of the following part under the general title of insulators for overhead lines with a nominal voltage above 1 000 V:

Part 1 Ceramic or glass insulator units for a.c. systems — Definitions, test methods and acceptance criteria

This standard supersedes IS 3188 : 1980 ‘Characteristics of string insulator units’. After publication of this standard, it shall be treated as withdrawn.

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