IEC 60664-1:2020

Insulation coordination for equipment within low-voltage supply systems - Part 1: Principles, requirements and tests

IEC 60664-1:2020

Name:IEC 60664-1:2020   Standard name:Insulation coordination for equipment within low-voltage supply systems - Part 1: Principles, requirements and tests
Standard number:IEC 60664-1:2020   language:English and French language
Release Date:25-May-2020   technical committee:TC 109 - Insulation co-ordination for low-voltage equipment
Drafting committee:MT 1 - TC 109/MT 1   ICS number:01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION

IEC 60664-1
Edition 3.0 2020-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
Insulation coordination for equipment within low-voltage supply systems –
Part 1: Principles, requirements and tests

Coordination de l’isolement des matériels dans les réseaux d’énergie électrique
à basse tension –
Partie 1: Principes, exigences et essais





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IEC 60664-1
Edition 3.0 2020-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ

Insulation coordination for equipment within low-voltage supply systems –

Part 1: Principles, requirements and tests

Coordination de l’isolement des matériels dans les réseaux d’énergie électrique

à basse tension –
Partie 1: Principes, exigences et essais

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.080.30 ISBN 978-2-8322-8287-8

– 2 – IEC 60664-1:2020 © IEC 2020
CONTENTS
FOREWORD . 6
1 Scope . 8
2 Normative references . 8
3 Terms, definitions and abbreviated terms . 9
3.1 Terms and definitions . 9
3.2 Abbreviated terms . 15
4 Basic technical characteristics for insulation coordination . 15
4.1 General . 15
4.2 Voltages . 16
4.2.1 General aspects . 16
4.2.2 Transient overvoltages . 17
4.2.3 Temporary overvoltages . 18
4.2.4 Recurring peak voltage . 18
4.2.5 Steady-state working voltage . 19
4.2.6 Steady-state peak voltage . 19
4.3 Overvoltage categories . 19
4.3.1 General . 19
4.3.2 Equipment energized directly from the mains supply . 19
4.3.3 Systems and equipment not energized directly from the mains supply . 20
4.4 Frequency . 20
4.4.1 General . 20
4.4.2 Solid insulation . 20
4.5 Pollution . 20
4.5.1 General . 20
4.5.2 Degrees of pollution in the micro-environment . 21
4.5.3 Conditions of conductive pollution. 21
4.6 Insulating material . 21
4.6.1 Solid insulation . 21
4.6.2 Stresses . 22
4.6.3 Comparative tracking index (CTI) . 23
4.7 Environmental aspects . 24
4.7.1 General . 24
4.7.2 Altitude . 24
4.7.3 Temperature . 24
4.7.4 Vibrations . 24
4.7.5 Humidity . 24
4.8 Duration of voltage stress . 24
4.9 Electrical field distribution . 25
5 Design for insulation coordination . 25
5.1 General . 25
5.1.1 Means of insulation coordination . 25
5.1.2 Frequency above 30 kHz . 25
5.1.3 Reduced distances due to coating or potting . 25
5.1.4 Equipment which are not connected to public low-voltage systems. . 25
5.2 Dimensioning of clearances . 25
5.2.1 General . 25

5.2.2 Dimensioning criteria for clearances . 26
5.2.3 Other factors involving clearances . 26
5.2.4 Dimensioning of clearances of functional insulation . 27
5.2.5 Dimensioning of clearances of basic insulation, supplementary
insulation and reinforced insulation . 27
5.3 Dimensioning of creepage distances . 28
5.3.1 General . 28
5.3.2 Dimensioning criteria of creepage distances . 29
5.3.3 Other factors involving creepage distances . 30
5.3.4 Dimensioning of creepage distances of functional insulation . 31
5.3.5 Dimensioning of creepage distances of basic insulation, supplementary
insulation and reinforced insulation . 31
5.4 Requirements for design of solid insulation . 32
5.4.1 General . 32
5.4.2 Voltage stress. 32
5.4.3 Withstand of voltage stresses . 32
5.4.4 Withstand on environmental stresses . 34
6 Tests and measurements . 34
6.1 General . 34
6.2 Verification of clearances . 35
6.2.1 General . 35
6.2.2 Test voltages . 35
6.3 Verification of creepage distances . 37
6.4 Verification of solid insulation . 37
6.4.1 General . 37
6.4.2 Selection of tests . 3
...

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