IS 13736 : Part 3 : Sec 0 : 1993/IEC 721-3-0 : 1984 Classification of nevironmental conditions: Part 3 Classification of groups of environmental parameters and their severities, Sec 0 Introduction

NATIONAL FOREWORD

This Indian Standard, which is identical with IEC Pub 721-3-0 ( 1984 ) Classification of environmental conditions - Part 3 : Classification of group of environmental parameters and their severities, Introduction, issued by the International Electrotechnical Commission, was adopted by the Bureau of Indian Standards on the recommendation of the Environmental Testing Procedures Sectional Committee ( LTD 02 ) and approval of the Electronics and Telecommuication Division Council.

The text of the IEC standard has been approved as suitable for publication as Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

Wherever the words International Standard appear, referring to this standard, they should be read as Indian Standard.

The concerned technical committee has reviewed the provisions of IEC 68, referred in this standard and has decided that it is acceptable for use in conjunction with this standard. Part 1 of this Indian Standard deals with classification of environmental parameters and their severities. The subsequent parts are intended to deal with the following:

a) Environmental conditions appearing in nature

b) Classification of groups of environmental parameters and their severities.