Reaffirmed 2024

NATIONAL FOREWORD

This Indian Standard (Part 3) which is identical with IEC 61439-3 : 2012 ‘Low-voltage switchgear and controlgear assemblies — Part 3: Distribution boards intended to be operated by ordinary persons (DBO)’ issued by the International Electrotechnical Commission (IEC) was adopted by the Bureau of Indian Standards on recommendation of the Low Voltage Switchgear and Controlgear Sectional Committee and approval of the Electrotechnical Division Council.

The Corrigendum 1 issued by IEC to IEC 61439-3 : 2012 is given at the end of this standard.

This Indian Standard is published in several parts. The other parts in this series are :

Part 0 Guidance to specifying assemblies

Part 1 General rules

Part 2 Power switchgear and controlgear assemblies

Part 4 Particular requirements for assemblies for construction sites (ACS) (under print)

Part 5 Assemblies for power distribution in public networks (under print)

Part 6 Busbar trunking systems (Busways)

Part 7 Assemblies for specific applications such as marinas, camping sites, market squares, electric vehicles charging stations

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 the decimal marker, while in Indian Standards, the current practice is to use a point (.) as a decimal marker.