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BSI PD IEC TR 63040:2016:2019 Edition

BSI PD IEC TR 63040:2016:2019 Edition

$167.15

Guidance on clearances and creepage distances in particular for distances equal to or less than 2 mm. Test results of research on influencing parameters

Published By Publication Date Number of Pages
BSI 2019 36
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This document describes test results of research on dimensioning of clearances and creepage distances, for spacing equal to or less than 2 mm for printed wiring material and other equivalent arrangements of insulation, where the clearance and the creepage distance follows the same path along the surface of solid insulation.

The information contained in this document is the result of research only and cannot be used for dimensioning the clearances and creepage distances for equipment within low-voltage systems, where IEC 60664-1 applies. However distances can be taken into account for functional reasons.

This document provides results of research related to the following criteria:

  1. clearances independent from the micro-environment;

  2. creepage distances for pollution degree 1, 2 and 3 which extends the use of smaller distances to products having design features similar to printed circuit boards;

  3. creepage distances to avoid flashover of the insulating surface;

  4. information on minimum creepage distances to maintain minimum insulation resistance.

A test method for the evaluation of the relevant water adsorption group for the surface of any insulating material which has not yet been classified is described.

PDF Catalog

PDF Pages PDF Title
2 National foreword
4 CONTENTS
6 FOREWORD
8 INTRODUCTION
9 1 Scope
2 Normative references
3 Terms and definitions
11 4 Fundamental aspects and phenomena of clearance and creepage distances
4.1 Mutual correlation of insulation characteristics with regard to environmental conditions
4.2 Pollution
4.2.1 General
12 4.2.2 Humidity level (HL)
4.2.3 Relation of humidity levels to macro-environment
Tables
Table 1 – Relation of the humidity levels to macro-environments
13 4.2.4 Comparative tracking index (CTI)
4.2.5 Flashover characteristics
14 5 Clearances and creepage distances
5.1 General
5.2 Clearances
5.2.1 Influencing criteria
15 Table 2 – Clearances for mutual correlation of insulation characteristics to withstand transient overvoltages
16 5.2.2 Altitude
Figures
Figure 1 – Clearances in air for mutual correlation of insulation characteristics to withstand transient overvoltages up to 2 000 m above sea level
17 Table 3 – Clearances to withstand steady-state voltages, temporary overvoltages or recurring peak voltages
18 5.3 Creepage distances
5.3.1 General
5.3.2 Influencing factors
20 Table 4 – Creepage distances for mutual correlation of insulation characteristics in equipment to avoid failure due to tracking
21 Figure 2 – Creepage distances for mutual correlation of insulation characteristics to avoid failure due to tracking
22 Table 5 – Creepage distances for mutual correlation of insulation characteristics to avoid flashover
23 Figure 3 – Creepage distances for mutual correlation of insulation characteristics to avoid flashover
24 5.3.3 Dimensioning of creepage distances of functional insulation
6 Additional information regarding creepage distance characteristics – surface current over a creepage distance (minimum insulation resistance)
Table 6 – Minimum insulation resistance
25 Table 7 – Creepage distances to maintain minimum insulation resistance (without condensation)
26 7 Water adsorption test
7.1 Object
7.2 Withstand characteristics of creepage distances under high humidity
Figure 4 – Creepage distances required to maintain minimum insulation resistance
27 7.3 Recommended test method
7.3.1 Test specimen
7.3.2 Measurement of the impulse withstand voltage
7.3.3 Procedure for characterization of the insulating materials
28 7.4 Definitions of the water adsorption groups
29 Figure 5 – Layout of the test specimen
Figure 6 – Test circuit
30 8 Dimensioning diagrams
Figure 7 – Critical relative humidity of insulating materials
31 Figure 8 – Diagram for dimensioning of clearances ≤ 2 mm for circuits directly connected to the supply mains (for low-voltage equipment up to 2 000 m)
32 Figure 9 – Diagram for dimensioning of clearances ≤ 2 mm for circuits not directly connected to the supply mains (for low-voltage equipment up to 2 000 m)
33 Figure 10 – Diagram for dimensioning of creepage distances ≤ 2 mm (for low-voltage equipment up to 2 000 m)
34 9 Withstand voltage test for creepage distance under humidity conditions
Figure 11 – Withstand voltage test for creepage distance under humidity conditions
35 Bibliography

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BSI PD IEC TR 63040:2016
$167.15