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1、BRITISH STANDARD BS 115:1995 Incorporating Amendment No. 1 Specification for Metallic resistance materials for electrical purposes UDC 621.316.84 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:16:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 115:1995 This British Standard, having been
2、prepared under the direction of the Cables and Insulation Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 March 1995 BSI 07-1999 First published September 1921 Second edition September 1924 Third edition January 1938 Fourth edition Apr
3、il 1954 Fifth edition March 1995 The following BSI references relate to the work on this standard: Committee reference CIL/55 Draft for comment 93/213613 DC ISBN 0 580 22961 0 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Cables and In
4、sulation Standards Policy Committee (CIL/-) to Technical Committee CIL/55, upon which the following bodies were represented: Covered Conductors Association Electrical and Electronic Insulation Association (BEAMA Ltd.) Transmission and Distribution Association (BEAMA Ltd.) Amendments issued since pub
5、lication Amd. No.DateComments 8751March 1995Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:16:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 115:1995 BSI 07-1999i Contents Page Committees responsibleInside front cover Forewordiii Introduction1 Secti
6、on 1. General 1.1Scope2 1.2References2 1.3Definitions2 1.4Information and requirements to be agreed and to be documented3 Section 2. Classification 2.1Classification and codes4 2.2Condition code6 2.3Grade of wire6 Section 3. Resistivity and resistance 3.1Nominal and actual resistivity8 3.2Nominal re
7、sistance8 3.3Actual resistance8 3.4Uniformity of resistance9 Section 4. Temperature coefficient of resistance 4.1General10 4.2Tolerances10 4.3Methods for temperature coefficient of resistance10 Section 5. Dimensions 5.1Out-of-roundness of wires11 5.2Tolerances on tape, strip and sheet11 Section 6. P
8、hysical, mechanical and other requirements 6.1Condition as-delivered12 6.2Thermoelectromotive force12 6.3Defects12 6.4Spiralling test for class C wire12 6.5Bend test for wire, strip and tape12 6.6Straightness of strip and tape12 6.7Other physical requirements12 Section 7. Product marking and documen
9、tation 7.1Label and information13 7.2Certificates of conformity13 Section 8. Packaging 8.1Winding, tangling and ends14 8.2Lengths14 8.3Filling of reels and drums14 8.4Removal of old identification14 Annex A (informative) Material conditions15 Annex B (informative) Testing and limits of uncertainty15
10、 Annex C (informative) Sizes in general use17 Annex D (informative) Conversion factors18 Annex E (informative) Guidance on health and safety18 Annex F (informative) Recommended tolerances for wire and strip supplied in cut and straightened lengths19 Table 1 Class A4 Licensed Copy: sheffieldun sheffi
11、eldun, na, Fri Nov 24 08:16:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 115:1995 ii BSI 07-1999 Page Table 2 Class B5 Table 3 Class C5 Table 4 Class D6 Table 5 Condition code7 Table 6 Tolerances on resistance of wire9 Table 7 Tolerances on resistance of tape and strip9 Table 8 Uniformity of res
12、istance of wire9 Table 9 Tolerances on temperature coefficient of resistance10 Table 10 Tolerances on width for tape and strip11 Table 11 Tolerances on sheet width11 Table 12 Tolerances on sheet thickness11 Table 13 Diameter of mandrel and number of turns12 Table 14 Jaw radii for bend test12 Table B
13、.1 Limits of uncertainty for resistivity and resistance15 Table B.2 Limits of uncertainty for temperature coefficient of resistance for classes A and B16 Table B.3 Limits of uncertainty of measurements when using the methods described in ASTM B7016 Table B.4 Limits of uncertainty of measurements for
14、 classes C and D16 Table C.1 Sizes in general use17 Table D.1 Conversion factors18 Table E.1 Exposure limits of elements18 Table F.1 Tolerances for cut and straightened wire lengths19 Table F.2 Tolerances for cut and straightened strip lengths19 List of referencesInside back cover Licensed Copy: she
15、ffieldun sheffieldun, na, Fri Nov 24 08:16:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 115:1995 BSI 07-1999iii Foreword This British Standard has been prepared under the direction of the Cables and Insulation Standards Policy Committee. It is a revision of BS 115:1954 which is withdrawn. Unlike
16、 the previous edition, in this standard metallic resistance materials are divided into four classes with no reference to the maximum working temperature of the materials. The inclusion of maximum working temperatures was considered to be too subjective, as the question of devising a suitable life te
17、st to prove these has been impractical, because of the numerous factors which affect high-temperature performance. Classification is therefore effected by typical values of temperature coefficient of resistance and resistivity. The materials are coded for class, alloy, condition and grade. New toler
18、ances have been introduced for resistance and uniformity of resistance of wire (including a new grade), out-of-roundness, straightness, the width of strip and tape, and the width and thickness of sheet. New sections have been included on temperature coefficient of resistance, spiralling test, produc
19、t marking, documentation, packaging and health and safety. The section on physical and mechanical properties has been modified. Formulae for the calculation of resistance per unit length of wire, strip and tape together with density/mass formulae for determining the cross-section of small dimensiona
20、l material are given. It has not been possible to specify definitive requirements for wire and strip supplied in cut and straightened lengths as the cutting and straightening processes can cause variations in electrical properties. Recommendations on dimensional tolerances have, however, been includ
21、ed. Product certification. Users of this British Standard are advised to consider the desirability of third party certification of product conformity with this British Standard based on testing and continuing product surveillance which may be coupled with assessment of a suppliers quality systems ag
22、ainst the appropriate Standard in the BS EN ISO 9000 series. Enquiries as to the availability of third party certification schemes are forwarded by BSI to the Association of British Certification Bodies. If a third party certification scheme does not already exist, users should consider approaching
23、an appropriate body from the list of Association members. 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. Compliance with a British Standard does not of itself confer immunity from
24、legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 20, 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
25、 table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:16:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:16:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 115:1995 BSI 07-19991 Introduction Maxim
26、um working temperatures are not definitive for an alloy. They are affected by the following: a) alloy type; b) temperature; c) diameter or thickness; d) temperature cycling; e) whether the elements are open to the atmosphere or surrounded by refractory, as in mineral filled elements; f) the general
27、conditions of use. For these reasons, classifying materials by maximum operating temperatures was not considered to be satisfactory. It was preferable to classify these materials by temperature coefficient of resistance and resistivity, subdividing these classes into alloys which could be coded by r
28、eference to typical composition. Due to order-disorder reactions, the resistivity and temperature coefficient of resistance of some of the materials in this standard are affected by the rate at which they are cooled from the annealing temperature. These values can also be altered by the amount of co
29、ld work, so that materials supplied in the tempered condition may be affected. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:16:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 115:1995 2 BSI 07-1999 Section 1. General 1.1 Scope This British Standard specifies requirements for the dimens
30、ions, electrical and mechanical properties of metallic resistance materials in the form of wire, strip, tape and sheet. It also provides a classification of these materials based on the typical temperature coefficient of resistance and resistivity, then subdivided into alloys. Codes are assigned to
31、each known alloy within the class. Other alloys, not specifically listed, may also be classified and coded. A grading of materials, based on tolerances on resistance, is also introduced. Requirements for product marking, documentation and packaging are also specified. In addition to the definitive r
32、equirements, this standard also requires the items detailed in 1.4 to be documented. For compliance with this standard, both the definitive requirements and the documented items have to be satisfied. Material conditions, limits of uncertainty, details of the sizes of wire in general use and conversi
33、on factors to foot-pound units are given in Annex A to Annex D and recommendations are also made relating to health and safety (Annex E). This standard does not specify requirements for wire and strip supplied in cut and straightened lengths but recommendations on tolerances are given in Annex F. NO
34、TE 1For nickel and nickel alloys supplied in cut and straightened lengths for structural use see BS 3073 and BS 3075. NOTE 2For fine resistance wires for special purposes, e.g. telecommunication, reference should be made to BS 1117. 1.2 References 1.2.1 Normative references This British Standard inc
35、orporates, by dated or undated reference, provisions from other publications. These normative references are made at the appropriate places in the text and the cited publications are listed on the inside back cover. For dated references, only the edition cited applies; any subsequent amendments to o
36、r revisions of the cited publication apply to this British Standard only when incorporated in the reference by amendment or revision. For undated references, the latest edition of the cited publication applies, together with any amendments. 1.2.2 Informative references This British Standard refers t
37、o other publications that provide information or guidance. Editions of these publications current at the time of issue of this standard are listed on the inside back cover, but reference should be made to the latest editions. 1.3 Definitions For the purposes of this British Standard the following de
38、finitions apply. 1.3.1 typical the average value derived from published data by all suppliers 1.3.2 nominal the average value declared by the supplier 1.3.3 actual the measured value 1.3.4 nominal resistance the resistance calculated from the nominal dimensions and nominal resistivity for the condit
39、ion of the material declared by the supplier (see 3.2) 1.3.5 strip cold rolled material, slit with square edges, in widths over 3 mm up to 152 mm 1.3.6 tape strip with rounded edges normally in the size ranges of width, 0.3 mm to 6.35 mm and thickness 0.05 mm to 2.0 mm NOTEReference should be made t
40、o the suppliers data to ascertain the combinations of width and thickness which are available. 1.3.7 round edged strip strip with rolled or ground round edges 1.3.8 sheet material in widths from 152 mm to 610 mm 1.3.9 concession a deviation in the physical, mechanical or dimensional properties of th
41、e metallic resistance material from that specified, that has been accepted by the purchaser Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:16:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 115:1995 BSI 07-19993 1.4 Information and requirements to be agreed and to be documented 1.4.1 Inf
42、ormation to be supplied by the purchaser The following information to be supplied by the purchaser shall be fully documented. Both the definitive requirements specified throughout this British Standard and the following documented items shall be satisfied before a claim of compliance with the standa
43、rd can be made and verified. a) The supply condition required if other than that specified in 6.1 (see also 2.2). b) The alloy, class and grade required. c) The tolerance on nominal resistance if other than that given in Table 6 or Table 7 (see 3.3). 1.4.2 Items to be agreed The following items to b
44、e agreed between the contracting parties, which are specified in the clauses referred to, shall be fully documented. Both the definitive requirements specified in this British Standard and the following documented items shall be satisfied before a claim of compliance with the standard can be made an
45、d verified. a) The form of declaration of the properties listed in 1.4.3 if other than as published literature. b) If the temperature coefficient of resistance in the range 20 C to 200 C is to be determined (see 4.3.2) on material in the as-despatched condition for classes C and D. c) If the values
46、of any of the additional physical properties listed in 6.7 are to be determined. d) Any additional information to be included in the certificate of conformity (see 7.2). 1.4.3 Information to be declared by the supplier The following information to be declared by the supplier shall be fully documente
47、d. a) The nominal resistivity (in 47cm) at 20 C for the material in the condition as supplied (see 3.1 and 3.2). b) The calculated nominal resistance per unit length of tape, wire, strip and round-edged strip at 20 C and, where applicable, the reduction factor used in the calculation of cross-sectio
48、nal area (see 3.2). c) The nominal temperature coefficient of resistance (see 4.1). d) For materials in classes A and B only, the nominal thermoelectromotive force (in mV/K) between 0 C and 100 C and the polarity of the material against copper (see 6.2). e) When agreed see 1.4.2 c), the nominal valu
49、es of the applicable physical properties listed in 6.7. NOTEThese nominal values may be documented in published literature or another form agreed between purchaser and supplier see 1.4.2 a). Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:16:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 115:1995 4 BSI 07-1999 Section 2. Classification 2.1 Classification and codes 2.1.1 General Metallic resistance materials shall be classified in accordance with 2.1.2 and individual alloys within the classes shall be coded i
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