ICS 29.080.30                          ETD 19

Revised Standard from Last Update.

NATIONAL FOREWORD

This Indian Standard (Part 4) which is identical with IEC/TR 60071- 4 : 2004 ‘ Insulation co-ordination — Part 4: Computational guide to insulation co-ordination and modelling of electrical networks’ issued by the International Electrotechnical Commission (IEC) was adopted by the Bureau of Indian Standards on the recommendation of the High Voltage Engineering 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 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.