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  • BS 7822-3:1995

    Current The latest, up-to-date edition.

    Insulation coordination for equipment within low-voltage systems Use of coatings to achieve insulation coordination of printed board assemblies

    Available format(s):  Hardcopy, PDF

    Language(s):  English

    Published date:  15-11-1995

    Publisher:  British Standards Institution

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    Table of Contents - (Show below) - (Hide below)

    Committees responsible
    National foreword
    Introduction
    SPECIFICATION
    1 Scope
    2 Normative references
    3 Definitions
    4 Design requirements
    5 Test specimens
    6 Tests
    Annexes
    A (normative) Test sequence for type A coating
    B (normative) Test sequence for type B coating
    C (informative) Measuring the insulation distance of a
       coated printed board
    Table
    1 Degrees of severities for rapid change of
       temperature
    Figures
    1 Test specimen
    2 Examples of land configurations
    C.1 Measurement of the insulation distance

    Abstract - (Show below) - (Hide below)

    Applies to rigid printed board assemblies with an insulating coating applied to one or both sides of the printed board. Describes the requirements and test procedures for printed board assemblies provided with coatings.

    Scope - (Show below) - (Hide below)

    This part of IEC 664 applies to rigid printed board assemblies with an insulating coating applied to one or both sides of the printed board. Such coatings are used to provide insulation and to protect the microenvironment of the printed board assembly surface against pollution, for the purpose of insulation coordination. It describes the requirements and test procedures for printed board assemblies provided with coatings.

    This part covers two types of coatings:

    • type A coating only provides protection against pollution. The clearance and creepage distance requirements of IEC 664-1 apply to the printed board assembly under the coating;
    • type B coating provides protection against pollution and insulation. There are no requirements for clearances and creepage distances under the coating. Only the requirements of IEC 664-1 for solid insulation apply.

    NOTE 1 For type B coating, the conductors are embedded in solid insulation consisting of the base material and the coating.

    NOTE 2 Clearances and creepage distance requirements apply to all uncoated parts of the board and between conductive parts over the coating.

    The principles in this part are applicable to functional and basic insulation.

    NOTE 3 For supplementary and reinforced insulation, additional requirements, which are under consideration, may apply.

    General Product Information - (Show below) - (Hide below)

    Committee GEL/109
    Development Note Supersedes 88/22388 DC (10/2005)
    Document Type Standard
    Publisher British Standards Institution
    Status Current

    Standards Referencing This Book - (Show below) - (Hide below)

    BS 5901:1980 Method of test for determining the comparative and the proof tracking indices of solid insulating materials under moist conditions
    BS 4584-103.3:1992 Metal-clad base materials for printed wiring boards. Special materials used in connection with printed circuits Specification for permanent polymer coating materials (solder resist) for use in the fabrication of printed boards
    BS 2011-2.1N:1985 Environmental testing. Tests Test N. Change of temperature
    BS 2011-2.1Ca:1977 Environmental testing. Tests Test Ca. Damp heat, steady state
    BS 6221-2:1991 Printed wiring boards Methods of test
    IEC 60068-2-2:2007 Environmental testing - Part 2-2: Tests - Test B: Dry heat
    BS 4727-1:GRP11(1991) : 1991 GLOSSARY OF ELECTROTECHNICAL, POWER, TELECOMMUNICATION, ELECTRONICS, LIGHTING AND COLOUR TERMS - TERMS COMMON TO POWER, TELECOMMUNICATIONS AND ELECTRONICS - PRINTED CIRCUITS
    IEC 60364-4-443:1995+AMD1:1998 CSV Electrical installations of buildings - Part 4: Protection for safety - Chapter 44: Protection against overvoltages - Section 443: Protection against overvoltages of atmospheric origin or due to switching
    IEC 60068-2-1:2007 Environmental testing - Part 2-1: Tests - Test A: Cold
    IEC 60664-1:2007 Insulation coordination for equipment within low-voltage systems - Part 1: Principles, requirements and tests
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