SOUTH AFRICAN NATIONAL STANDARD
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1 ISBN Edition 4.1 IEC :2016 Edition 5.1 SOUTH AFRICAN NATIONAL STANDARD Low-voltage fuses Part 2: Supplementary requirements for fuses for use by authorised persons (fuses mainly for industrial application) Examples of standardized systems of fuses A to K This national standard is the identical implementation of IEC :2016, and is adopted with the permission of the International Electrotechnical Commission. WARNING This standard references other documents normatively. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001 Tel: Fax: SABS
2 Edition 4.1 IEC :2016 Edition 5.1 Table of changes Change No. Date Scope IEC amdt Amended to update the requirements on fuse system A Fuses with fuse-links with blade contacts (NH fuse system), fuse system F Fuses with fuse-links having cylindrical contact caps (NF cylindrical fuse system), fuse system H Fuses with fuse-links having gd and gn characteristics (class J class T and class L time delay and non time delay fuse types), fuse system J-Fuses with fuse-links having "gd class CC" and "gn class CC" characteristics (class CC time delay and non-time delay fuse types) and fuse system K gk fuse-links with blade contacts for bolted connections high current fuse-link ratings from A up to 4 800A (Master fuse-links). National foreword This South African standard was approved by National Committee SABS/TC 067/SC 05, Electricity distribution systems and components Electricity distribution, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This document was approved for publication in November This document supersedes SANS :2014 (edition 4). Compliance with this document cannot confer immunity from legal obligations. SABS
3 CONSOLIDATED VERSION VERSION CONSOLIDÉE IEC Edition colour inside Low-voltage fuses Part 2: Supplementary requirements for fuses for use by authorized persons (fuses mainly for industrial application) Examples of standardized systems of fuses A to K Fusibles basse tension Partie 2: Exigences supplémentaires pour les fusibles destinés à être utilisés par des personnes habilitées (fusibles pour usages essentiellement industriels) Exemples de systèmes de fusibles normalisés A à K INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS ISBN Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé. Registered trademark of the International Electrotechnical Commission Marque déposée de la Commission Electrotechnique Internationale
4 2 IEC :2013+AMD1:2016 CSV IEC 2016 CONTENTS FOREWORD INTRODUCTION General scope Scope Normative references Fuse system A Fuses with fuse-links with blade contacts (NH fuse system) General Scope Terms and definitions Conditions for operation in service Classification Characteristics of fuses Rated voltage Rated current of the fuse-link Rated current of the fuse-holder Rated power dissipation of a fuse-link and rated acceptable power dissipation of a fuse-holder Limits of time-current characteristics Time-current characteristics, time-current zones and overload curves Conventional times and currents Gates Rated breaking capacity Markings Markings of fuse-holders Markings of fuse-links Standard conditions for construction Mechanical design Connections, including terminals Fuse-contacts Construction of fuse-bases Construction of a fuse-link Insulating properties and suitability for insulation I 2 t characteristics Overcurrent discrimination of fuse-links Protection against electric shock Tests Arrangement of the fuse and dimensions Testing of fuse-holders Acceptability of test results Resistance to tracking Verification of temperature rise and power dissipation Arrangement of the fuse Measurement of the temperature rise Test method... 30
5 IEC :2013+AMD1:2016 CSV 3 IEC Acceptability of test results Verification of overcurrent discrimination Verification of resistance to heat Fuse-base Fuse-links with gripping-lugs of moulded material or of metal fixed in moulded material Verification of non-deterioration of contacts Arrangement of the fuse Test method Acceptability of test results Mechanical and miscellaneous tests FIGURES Annex AA (informative) Special test for cable overload protection AA.1 Arrangement of the fuse AA.2 Test method and acceptability of test results Fuse system B Fuses with striker fuse-links with blade contacts (NH fuse system) General Scope Terms and definitions Conditions for operation in service Classification Characteristics of fuses Rated voltage Rated current of the fuse-link Rated current of the fuse-holder Rated power dissipation of a fuse-link and rated acceptable power dissipation of a fuse-holder Limits of time-current characteristics Rated breaking capacity Markings Standard conditions for construction Mechanical design Connections, including terminals Fuse-contacts Construction of a fuse-link Insulating properties and suitability for insulation I 2 t characteristics Overcurrent discrimination of "gg" fuse-links Protection against electric shock Tests Testing of fuse-holders Verification of temperature rise and power dissipation Verification of overcurrent discrimination Verification of resistance to heat Fuse-base... 63
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