IS/IEC 60079 : Part 0 : 2017 Explosive Atmospheres - Part 0 Equipment-General Requirements

Revised Standard from Last Update.

NATIONAL FOREWORD

This Indian Standard (Part 0) (Third Revision) which is identical with IEC 60079-0 : 2017 ‘Explosive atmospheres — Part 0: Equipment — General requirements’ issued by the International Electrotechnical Commission (IEC) was adopted by the Bureau of Indian Standards on recommendation of the Electrical Apparatus for Explosive Atmospheres Sectional Committee and approval of the Electrotechnical Division Council.

Second revision of this standard was published in 2015 and was identical with IEC 60079-0 : 2011. The third revision of this standard has been undertaken to align it with the latest version of IEC 60079-0 : 2017.

The major changes in this revision are as follows:

a) Dust layer requirements for EPL Db with a dust layer in a specified orientation have been added.

b) With respect to limitation of thickness of non-metallic layer for Group I and Group II equipment, the breakdown voltage shall be ≤ 4 kV DC.

c) Limitation has been added for external surfaces of > 65 percent copper.

d) For plugs and sockets, requirements for EPL Gc and Dc have been added.

e) Voltage values were changed following additional research due to the complicated assessment and sometimes unspecified construction of Li/Ion-cells.

f) The alternate marking of EPL has been deleted. The now required EPL marking may be other than that permitted by the Level of Protection to account for limiting restrictions of material or plastic material surface area.

g) Additional instruction material for electric machines required to facilitate selection, installation, and maintenance for electric machines have been added.

h) Additional instruction material for cable glands required to facilitate selection and installation have been added. The text of the IEC Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminologies 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.