BS-7822-3-1995 IEC-60664-2-1-1997.pdf
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1、BRITISH STANDARD BS 7822-3: 1995 IEC 664-3: 1992 Insulation coordination for equipment within low-voltage systems Part 3: Use of coatings to achieve insulation coordination of printed board assemblies Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:56:52 GMT+
2、00:00 2006, Uncontrolled Copy, (c) BSI BS 7822-3:1995 This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 November 1995 BSI 08-1999 The following BSI references rela
3、te to the work on this standard: Committee reference GEL/28/1 Draft for comment 88/22388 DC ISBN 0 580 24554 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee GEL/28, Insulation coordination, to Subcommittee GEL/28/1, Ins
4、ulation coordination for low voltage equipment, upon which the following bodies were represented: Association of Control Manufacturers TACMA (BEAMA Ltd.) Association of Manufacturers of Domestic Electrical Appliances Association of Manufacturers Allied to the Electrical and Electronic Industry (BEAM
5、A Ltd.) British Electrotechnical Approvals Board Department of Trade and Industry (Consumer Safety Unit, CA Division) Electrical Installation Equipment Manufacturers Association Electricity Association GAMBICA (BEAMA Ltd.) Institute of Electrical Engineers Transmission and Distribution Association (
6、BEAMA Ltd.) Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:56:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7822-3:1995 BSI 08-1999i Contents Page Committees responsible Inside front cover National
7、foreword ii Introduction1 1Scope1 2 Normative references1 3 Definitions2 4 Design requirements2 5 Test specimens3 6 Tests5 Annex A (normative) Test sequence for type A coating10 Annex B (normative) Test sequence for type B coating10 Annex C (informative) Measuring the insulation distance of a coated
8、 printed board10 Figure 1 Test specimen8 Figure 2 Examples of land configurations9 Figure C.1 Measurement of the insulation distance12 Table 1 Degrees of severities for rapid change of temperature5 List of references Inside back cover Licensed Copy: London South Bank University, London South Bank Un
9、iversity, Fri Dec 08 11:56:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7822-3:1995 ii BSI 08-1999 National foreword This British Standard has been prepared by Technical Committee GEL/28/1 and is identical with IEC 664-3:1992 Insulation coordination for equipment within low-voltage systems Part
10、3: Use of coatings to achieve insulation coordination of printed board assemblies, published by the International Organization for Standardization (IEC). IEC 664 has the status of a basic safety publication in accordance with IEC Guide 104. It is envisaged that BS 7822 will consist of the following
11、parts under the general title Insulation coordination for equipment within low-voltage systems. Part 1: Principles, requirements and tests; Part 2: Concise requirements for clearances, creepage distances and solid insulation; (Under consideration) Part 3: Use of coatings to achieve insulation coordi
12、nation of printed board assemblies; (This Part) Part 4: Application guide. (Under consideration) Cross-references Publications referred toCorresponding British Standard IEC 62-2-3:1969BS 2011 Environmental testing Part 2.1 Tests Part 2.1Ca:1977 Test Ca. Damp heat, steady state IEC 68-2-14:1984Part 2
13、.1N:1985 Test N. Change of temperature IEC 112:1979BS 5901:1980 Method of test for determining the comparative and the proof tracking indices of solid insulating materials under moist conditions IEC 194:1988BS 4727 Glossary of electrotechnical, power, telecommunications, electronics, lighting and co
14、lour terms Part 1 Terms common to power, telecommunications and electronics Group 11:1991 Printed circuits IEC 216-2BS 5691 Guide for the determination of thermal endurance properties of electrical insulating materials Part 2:1979 List of materials and available tests IEC 249-3-3:1991BS 4584 Metal-c
15、lad base materials for printed wiring boards Part 103 Special materials used in connection with printed circuits Section 103.3:1992 Specification for permanent polymer coating materials (solder resist) for use in the fabrication of printed boards BS 6221 Printed wiring boards IEC 326-2:1990Part 2:19
16、91 Methods of test IEC 326-4:1980Part 4:1982 Method for specifying single and double sided printed wiring boards with plain holes Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:56:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7822-3:1995 BSI 08-1999iii A
17、British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a
18、front cover, an inside front cover, pages i to iv, pages 1 to 12, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South
19、Bank University, London South Bank University, Fri Dec 08 11:56:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:56:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7822-3:1995 BSI 08-19991 Introduction Th
20、is part of IEC 664 applies to rigid printed board assemblies protected by a coating of insulating material on one side or both sides of the printed board. It deals with the influence of these coatings on the insulation properties. It does not cover repaired printed board assemblies. Between any two
21、uncoated conductive parts and over the coating between conductive parts, the clearance and creepage distance requirements of IEC 664-1 apply. The coatings considered in this part are permanent protective coatings, such as the following: permanent solder resists (wet or dry film) using screen printin
22、g or photo definable processes; coverlayers, i.e. insulating protective layers placed on the surface of a printed board; conformal coating, i.e. insulating coating applied to printed board assemblies. Coating considered in this part may also include such encapsulation as moulding or potting. Technic
23、al Committees have to consider the influence of overheating of conductors and components, especially under fault conditions, and to decide if any additional requirements are necessary. Not all coating systems in use are capable of improving insulation properties. The tests specified in this part can
24、 be used to determine the suitability of the coating systems. Safe performance of printed board assemblies is dependent upon a precise and controlled manufacturing process for the application of the coating. Requirements for quality control, e.g. by sampling tests, should be considered by Technical
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