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BSI PD IEC/TR 60664-2-1:2011

BSI PD IEC/TR 60664-2-1:2011

$198.66

Insulation coordination for equipment within low-voltage systems – Application guide. Explanation of the application of the IEC 60664 series, dimensioning examples and dielectric testing

Published By Publication Date Number of Pages
BSI 2011 68
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This part of IEC 60664, which is a technical report, serves as an application guide for technical committees and manufacturers specifying dimensioning requirements for products in accordance with the IEC 60664 series.

The significant items for consideration are as follows:

  1. nominal system voltage(s) or rated insulation voltage(s);

  2. overvoltage category of the products (OV cat.);

  3. any type of overvoltages;

  4. frequency of the voltage;

  5. characteristics of the solid insulating material;

  6. pollution degree and humidity levels.

PDF Catalog

PDF Pages PDF Title
4 English
CONTENTS
8 FOREWORD
10 INTRODUCTION
11 1 Scope
2 Normative references
12 3 Terms and definitions
19 4 Principles and practical application of the IEC 60664 series for insulation dimensioning of LV equipment
4.1 Basic principles
4.2 Coordination of overvoltage categories inside equipment
20 4.3 Practical use of the IEC 60664 series for the dimensioning of clearances
22 4.4 Practical use of the IEC 60664 series for the dimensioning of creepage distances
25 4.5 Practical use of the IEC 60664 series for the dimensioning of solid insulation
26 Figures

Figure 1 – Breakdown voltage of solid insulation dependingupon the time of voltage stress
28 Tables

Table 1 – Examples for rated voltage 100 V and 230 V and overvoltage category II
29 Figure 2 – Series connection of clearance and solid insulation
Figure 3 – Capacitive voltage divider
33 4.6 Practical use of the IEC 60664 series for designing functional insulation
34 4.7 Practical use of the IEC 60664 series for dimensioning with respect to the influence of the frequency of the voltage
36 5 Four examples showing appropriate dimensioning of insulation within equipment
5.1 General
Figure 4 – Permissible field strength for dimensioning of solid insulationaccording to Equation (7)
37 Figure 5a – Example 1 – Simple illustration of insulation system containingfunctional, basic and reinforced/double insulation for a class I equipment
38 5.2 Examples for the dimensioning of clearances for class I equipment according to IEC 60664-1
Figure 5b – Example 2 – Dimensioning of clearances for class I equipment,based on overvoltage category III
Table 2 – Example 2 – Dimensioning of clearances according to Table F.2of IEC 60664-1:2007 (pollution degree 2) (see example 2 of Figure 5b)
39 5.3 Examples for the dimensioning of clearances for class II equipment according to IEC 60664-1
Figure 5c – Example 3 – Dimensioning of clearances (class II equipment)
Table 3 – Example 2 – Dimensioning of clearances according to Tables F.2 and F.7a of IEC 60664-1:2007, temporary overvoltages according to 5.3.3.2.3 of IEC 60664-1:2007 (Un+1 200 V) (see example 2 of Figure 5b)
40 Table 4 – Example 3 – Dimensioning of clearances according to Table F.2 ofIEC 60664-1:2007 (pollution degree 2) (see example 3 of Figure 5c)
Table 5 – Example 3 – Dimensioning of clearances according to Tables F.2 and F.7a of IEC 60664-1:2007, temporary overvoltages according to 5.3.3.2.3 of IEC 60664-1:2007 (Un+1200 V) (see example 3 of Figure 5c)
41 5.4 Examples for the dimensioning of clearances for class II equipment according to IEC 60664-5
Figure 5d – Example 4 – Dimensioning of clearances (class II equipment)
Table 6 – Example 4 – Dimensioning of clearances according to Table 2 of IEC 60664-5:2007 (see example 4 on Figure 5d)
42 6 Practical application of the IEC 60664 series with regards to particular questions
6.1 General
6.2 Testing complete equipment in case of components bridging the basic insulation
Table 7 – Example 4 – Dimensioning of clearances according to Tables 2 and 3 of IEC 60664-5:2007, temporary overvoltages according to 5.3.3.2.3 of IEC 60664-1:2007 (Un+1 200 V) (see example 4 on Figure 5d)
43 6.3 Testing complete equipment in case of components bridging the functional insulation
Figure 6 – Arrangement for a.c. (or d.c.) voltage test
44 6.4 Dimensioning of insulation distances for parts of equipment which can have isolation capability
45 6.5 Testing with respect to high-frequency voltage stress
6.6 Practical information in case of substitution an impulse withstand test by an AC or DC test
46 7 Examples of a dimensioning worksheet (based on case A as described in IEC 60664-1:2007)
7.1 Use of IEC 60664-1:2007, for circuits in equipment either directly or not directly connected to the mains supply
Table 8 – Relationship between influencing parametersand normative references in IEC 60664-1
47 7.2 Use of IEC 60664-5:2007, for circuits in equipment either directly or not directly connected to the mains supply
Table 9 – Relationship between influencing parameters and normative referencesin IEC 60664-1 or IEC 60664-5
48 7.3 Use of IEC 60664-4:2005, for circuits in equipment either directly or not directly connected to the mains supply
Table 10 – Relationship between influencing parametersand normative references in IEC 60664-1 or IEC 60664-4
50 7.4 Examples comparing the dimensioning of clearances and creepage distances according to IEC 60664-1 and IEC 60664-5 based on case A condition (basic insulation, for equipment up to 2 000 m altitude)
Table 11 – Example for dimensioning a clearance and creepage distance following IEC 60664-1
51 Table 12 – Example for dimensioning a clearance and creepage distance following IEC 60664-5
Table 13 – Example for dimensioning a clearance and creepage distance following IEC 60664-1 in circuits not directly connected to mains supply
52 7.5 Examples of dimension comparison for clearances and creepage distances according to IEC 60664-1 and IEC 60664-4 based on case A condition (basic insulation, for equipment up to 2 000 m altitude)
Table 14 – Example for dimensioning a clearance and creepage distance following IEC 60664-5 in circuits not directly connected to mains supply
53 Table 15 – Example for dimensioning a clearance and creepage distance following IEC 60664-1 in circuits not directly connected to mains supply
Table 16 – Example for dimensioning a clearance and creepage distance following IEC 60664-4 (approximately homogeneous field)
54 Table 17 – Example for dimensioning a clearance and creepage distance following IEC 60664-1 in circuits not directly connected to mains supply
55 Table 18 – Example for dimensioning a clearance and creepage distance following IEC 60664-4 (approximately homogeneous field)
56 Annex A (informative)Overview of clauses of IEC 60664-1 requiring decisions by technical committees, specification of options or requiring activities by the manufacturer
Table A.1 – Clauses and titles of IEC 60664-1 and items to be consideredby technical committees
58 Table A.2 – Clauses and titles of IEC 60664-1 and optional specifications for consideration by technical committees
59 Table A.3 – Clauses and titles of IEC 60664-1 and required manufacturer activities
60 Annex B (informative)Overview of clauses of IEC 60664-4 requiring decisions by technical committees
Table B.1 – Clauses and titles of IEC 60664-4 and optional specifications for consideration by technical committees
61 Annex C (informative)Overview of clauses of IEC 60664-5 requiring decisions by technical committees, specification of options or requiring activities by the manufacturer
Table C.1 – Clauses and titles of IEC 60664-5 and items to be considered by technical committees
63 Table C.2 – Clauses and titles of IEC 60664-5 and optional specifications for consideration by technical committees
64 Table C.3 – Clauses and titles of IEC 60664-5 and required manufacturer activities
65 Annex D (informative)Dimensioning of clearances and creepage distances for d.c. voltages above 1 000 V d.c.
Table D.1 – Rated impulse voltage for equipment
66 Bibliography

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