Reaffirmed 2018

NATIONAL FOREWORD

This Indian Standard (Part 4) (First Revision) which is identical with IEC 60216-3 : 2006 ‘Electrical insulating materials - Thermal endurance properties - Part 3: Instructions for calculating thermal endurance characteristics’ issued by the International Electrotechnical Commission (IEC) was adopted by the Bureau of Indian Standards on the recommendation of the Solid Electrical Insulating Materials and Insulating Systems Sectional Committee and approval of the Electrotechnical Division Council.

This standard was first published in 1994 with considerable assistance derived from IEC 60216-3 : 1986. This revision has been undertaken to align the standard with the latest version of IEC 60216-3 : 2006.

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.