New Standard from Last Update.

NATIONAL FOREWORD

This Standard (Part 20/Sec 1) (First Revision) which is identical with IEC TS 60034-20-1 : 2002 ‘Rotating electrical machines - Part 20-1: Control motors - Stepping motors’ issued by the International Electrotechnical Commission (IEC) was adopted by the Bureau of Indian Standards on the recommendation of the Rotating Machinery Sectional Committee and approval of the Electrotechnical Division Council.

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’ appears referring to this standard, theyshould 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.