IEC 60664-1: Insulation coordination for equipment within low-voltage supply systems - Part 1: Principles, requirements and tests (IEC 60664-1:2020)

171 Pages·2020·8.971 MB·English

by  International Electrotechnical Commission

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INTERNATIONAL

ELECTROTECHNICAL

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COMMISSION

ELECTROTECHNIQUE

INTERNATIONALE

ICS 29.080.30 ISBN 978-2-8322-8287-8

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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
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6.5.2 Parts to be tested .......................................................................................... 43
6.5.3 Preparation of equipment circuits ................................................................... 44
6.5.4 Test voltage values ........................................................................................ 44
6.5.5 Test criteria ................................................................................................... 44
6.6 Other tests ............................................................................................................ 44
6.6.1 Test for purposes other than insulation coordination ...................................... 44
6.6.2 Sampling and routine tests ............................................................................ 44
6.6.3 Measurement accuracy of test parameters ..................................................... 44
6.7 Measurement of the attenuation of the transient overvoltages ............................... 45
6.8 Measurement of clearances and creepage distances ............................................ 45
Annex A (informative) Basic data on withstand characteristics of clearances ....................... 51
Annex B (informative) Nominal voltages of mains supply for different modes of
overvoltage control ............................................................................................................... 56
Annex C (normative) Partial discharge test methods ............................................................ 58
C.1 Test circuits .......................................................................................................... 58
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Annex F (normative) Tables ................................................................................................. 68
Annex G (informative) Determination of clearance distances according to 5.2 ...................... 77
Annex H (informative) Determination of creepage distances according to 5.3 ....................... 79
Bibliography .......................................................................................................................... 81

Figure 1 – Recurring peak voltage ........................................................................................ 19
Figure 2 – Determination of the width (W) and height (H) of a rib .......................................... 31
Figure 3 – Test voltages ....................................................................................................... 42
Figure 4 – Across the groove ................................................................................................ 46
Figure 5 – Contour of the groove .......................................................................................... 47
Figure 6 – Contour of the groove with angle .......................................................................... 47
Figure 7 – Contour of rib ....................................................................................................... 47
Figure 8 – Uncemented joint with grooves less than X .......................................................... 48
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Table F.4 – Three-phase four-wire or three-wire AC systems ................................................ 71
Table F.5 – Creepage distances to avoid failure due to tracking (1 of 2) ............................... 72
Table F.6 – Test voltages for verifying clearances only at different altitudes ......................... 74
Table F.7 – Severities for conditioning of solid insulation ...................................................... 74
Table F.8 – Dimensioning of clearances to withstand steady-state peak voltages,
temporary overvoltages or recurring peak voltages b ........................................................... 75
Table F.9 – Additional information concerning the dimensioning of clearances to avoid
partial discharge ................................................................................................................... 75
Table F.10 – Altitude correction factors for clearance correction ........................................... 76
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9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60664-1 has been prepared by IEC technical committee 109:
Insulation co-ordination for low-voltage equipment.
This third edition cancels and replaces the second edition published in 2007. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) update of the Scope, Clauses 2 and 3,
b) new structure for Clauses 4 and 5,
c) addition of 1 500 V DC into tables in Annex B and F,
d) update of distances altitude correction in a new Table F.10,
e) addition of Annex G with a flowchart for clearances,
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colour printer.
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One of the responsibilities of a technical committee is, wherever applicable, to make use of
basic safety publications in the preparation of its publications.
However, in case of missing specified values for clearances, creepage distances and
requirements for solid insulation in the relevant product standards, or even missing
standards, this document applies.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 60068-2-2, Environmental testing – Part 2-2: Tests – Tests B: Dry heat
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Note 1 to entry: Mains supply includes public or private utilities and, unless otherwise specified in this document,
equivalent sources such as motor-driven generators and uninterruptible power supplies.
3.1.3
insulation coordination
mutual correlation of insulation characteristics of electrical equipment taking into account the
expected micro-environment and other influencing stresses
Note 1 to entry: Expected voltage stresses are characterized in terms of the characteristics defined in 3.1.7
to 3.1.16.
[SOURCE: IEC 60050-442:2014, 442-09-01, modified – “electrical” replaces “electric” and
Note 1 to entry has been added.]
3.1.4
clearance
shortest distance in air between two conductive parts
[SOURCE: IEC 60050-581:2008, 581-27-76]