1、BRITISH STANDARD BS 5689-1: 1979 IEC 394-1: 1972 Varnished fabrics for electrical purposes Part 1: Definitions and general requirements UDC 621.315.614.72:677.077.625.17BS5689-1:1979 This British Standard, having been prepared under the directionof the General Electrotechnical Engineering Standards
2、Committee, was published under the authority ofthe Executive Board on 31 January 1979 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference GEL/16 Draft for comment 77/31709 DC ISBN 0 580 10565 2 Cooperating organizations The General Electrotechnical Engin
3、eering Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Associated Offices Technical Committee British Approvals Service for Electric Cables Ltd. British E
4、lectrical and Allied Manufacturers Association (BEAMA) British Radio Equipment Manufacturers Association British Steel Corporation Department of Energy (Electricity) Electric Cable Makers Confederation Electrical Contractors Association Electrical Contractors Association of Scotland Electrical Resea
5、rch Association* Electrical, Electronic, Telecommunications Plumbing Union Electricity Supply Industry in England and Wales* Electronic Components Industry Federation* Engineering Equipment Users Association Health and Safety Executive Home Office Institution of Electrical Engineers Ministry of Defe
6、nce National Coal Board* Oil Companies Materials Association Post Office* Telecommunication Engineering and Manufacturing Association (TEMA)* The organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the prepar
7、ation of this British Standard: Adhesive Tape Manufacturers Association British Paper and Board Industry Federation (PIF) British Plastics Federation Department of Industry (British Calibration Service) Department of Industry (National Physical Laboratory) Electrical and Electronic and Insulation As
8、sociation (BEAMA) Rotating Electrical Machines Association (BEAMA) Transmission and Distribution Association (BEAMA) Amendments issued since publication Amd. No. Date of issue CommentsBS5689-1:1979 BSI 08-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii Introduc
9、tion 1 1 Scope 1 2 Designation 1 3 Definitions 1 4 General requirements 1 5 Dimensions 2 6 Conditions of supply 2 Publications referred to Inside back coverBS5689-1:1979 ii BSI 08-1999 National foreword This British Standard is identical with IEC Publication394-1 “Specification for varnished fabrics
10、 for electrical purposes” Part1 “Definitions and general requirements” published by the International Electrotechnical Commission (IEC). It is published under the direction of the General Electrotechnical Engineering Standards Committee. Other Parts of this standard are: Part 2: Methods of test; Par
11、t 3: Specifications for individual materials (in course of preparation). It is the intention that this standard will ultimately replace BS419:1966 “Varnished fabrics and tapes for electrical purposes”. A decision on withdrawal of this standard will be taken when the specification sheets for the resp
12、ective individual materials have been issued in Part3 of this standard. Terminology and conventions. The text of the International Standard has been approved as suitable for publication without deviation, as a British Standard. Some terminology and certain conventions are not identical with those us
13、ed in British Standards; attention is especially drawn to the following. Where the word “recommendation” appears, referring to this standard, it should be interpreted as “British Standard”. In the second paragraph of the Introduction, the word “series” should be interpretated as “British Standard”.
14、A 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
15、a front cover, an inside front cover, pages i and ii, pages1 and 2, 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.BS5689-1:1979 BSI 08-1999 1
16、 Introduction This recommendation is one of a series which deals with varnished fabrics comprising bases woven from cotton, natural silk, or synthetic fibres (including glass) supplied in the form of full width rolls, sheets, or tapes slit to various widths. The series will have three parts describi
17、ng: 1) Definitions and general requirements; 2) Methods of test; 3) Specifications for individual materials. 1 Scope This part of the recommendation contains the definitions related to, and the general requirements to be fulfilled by, varnished fabrics for electrical purposes. 2 Designation The varn
18、ished fabrics shall be described in words which identify first the type of varnish and second the base fabric. The more commonly used materials are listed below: The associated code letters may be used to abbreviate the description when necessary. Further materials and symbols will be added if the n
19、eed for them becomes apparent. NOTEConsideration is being given to methods of test for thermal endurance and an addition to the designation indicating this will be proposed as soon as possible. The type of surface finish is to be agreed between purchaser and supplier e.g., dry, greasy, tacky, etc.,
20、and also the colour. 3 Definitions For the purpose of this recommendation, the following definitions apply: 3.1 full width material material of production width, e.g., about1m as ordered, with or without selvages 3.2 slit material material without selvages cut from full width material 3.3 straight-c
21、ut material cut parallel to the warp direction 3.4 bias-cut material cut so that both the warp and weft threads make an angle with the edges other than0 or90 3.5 panel form bias-cut bias-cut material in short lengths not joined together 3.6 sewn bias-cut bias-cut material in short lengths sewn toget
22、her before or after varnishing, to form a continuous length 3.7 stuck bias-cut Bias-cut material in short lengths stuck together with an adhesive after varnishing, to form a continuous length 3.8 seamless bias-cut bias-cut material produced in a continuous length by helical cutting from a woven slee
23、ve and then varnished 4 General requirements 4.1 Quality All material in any one consignment shall be as consistent as possible and have properties within the limits of this specification throughout the whole length of each roll. The varnished fabric shall be flexible, the surface shall be uniform,
24、reasonably smooth and reasonably free from defects such as bubbles, air holes, creases and flaws. It shall be capable of being unrolled without damage. Types of varnish: OR Oleoresinous PF Phenolic AK Alkyd PUR Polyurethane EP Epoxide SI Silicone BT Bitumen. Types of base material: C Cotton R Viscos
25、e rayon S Silk PETP Polyethylene terephtalate G Glass PA PolyamideBS5689-1:1979 2 BSI 08-1999 4.2 Joins (splices) in bias-cut materials 4.2.1 Sewn or stuck bias-cut materials The length of material between any two successive joins shall be not less than1.2m. The joins shall be unmarked and their ten
26、sile strengths shall be not less than the minimum values given in Part3 of this specification for the tensile strength of the material, unless otherwise agreed between purchaser and supplier. Adhesive or adhesive tape used to stick joins and the method of making a join shall be the subject of agreem
27、ent between purchaser and supplier. 4.2.2 Panel form bias-cut materials The recommended roll lengths shall be made up of pieces not less than1.2m in length. Individual pieces may be made up into rolls of appropriate total length by interleaving with a continuous length of a suitable material. 5 Dime
28、nsions 5.1 Thickness The nominal thickness of the varnished fabric shall be one of the following:0.06mm,0.08mm,0.10mm,0.12mm, 0.15mm,0.20mm,0.25mm,0.30mm,0.40mm, 0.50mm or0.60mm (R 10 Series). The central value of the measured thickness shall be within 10% of the nominal value or 0.01mm of the nomin
29、al thickness, whichever is the greater. NOTEThe median value and the central value are to be considered equivalent. The measurement shall be carried out following the method published in Part2, Clause2, of this specification. 5.2 Width Full width material, e.g., about1m wide, shall have a tolerance
30、of 2.5%. The tolerance on material less wide shall be the subject of agreement between purchaser and supplier. The tolerance for slit material shall be 0.5mm up to a width of100mm and 1% for width above100mm. 5.3 Length The nominal length of a roll is the minimum length. Recommended lengths are50m a
31、nd100m. With the exception of panel form bias-cut material, any one roll of material is allowed to contain not more than two individual piece lengths, neither of which should be shorter than10m. If the electrical or mechanical property or both of the material are not maintained in the join between t
32、he two pieces, the join shall be marked. A join shall be marked in a way visible without unrolling the material. 6 Conditions of supply The material shall be rolled on a cardboard or other suitable core. The inner diameter of the core shall be agreed by purchaser and supplier, and it should preferab
33、ly be40mm or55mm. Sheets may be supplied also in the form of stacks. The material shall be placed in a packing which ensures adequate protection during transport, handling and storage. The type, width, and thickness of the material, the length of the roll, or the number of sheets in a stack, and the
34、 date of manufacture shall be clearly marked on the outside of each package.BS5689-1:1979 BSI 08-1999 Publications referred to See national forewordBS 5689-1: 1979 IEC 394-1: 1972 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible
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