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1、BRITISH STANDARD CONFIRMED AUGUST 1988 BS 4579-1: 1970 Reprinted, incorporating Amendments No. 1 June 1976, No.2 (November 1980) and No. 3 (March 1985). The performance of mechanical and compression joints in electric cable and wire connectors Part 1: Compression joints in copper conductors UDC 621.
2、315.68:621.315.55.669.3 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 01:48:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4579-1:1970 This British Standard, having been approved by the Electrical Industry Standards Committee, was published under the authority of the Executive Board on 14
3、 September, 1970 BSI 01-1999 The following BSI references relate to the work on this standard: Committee reference ELE/95 Draft for comment 67/2986 SBN 580 05688 0 Co-operating organizations The Electrical Industry Standards Committee, under whose supervision this British Standard was prepared, cons
4、ists of representatives from the following Government departments and scientific and industrial organizations: Associated Offices Technical Committee Association of Consulting Engineers Association of Manufacturers of Domestic Electrical Appliances Association of Mining Electrical and Mechanical Eng
5、ineers Association of Supervisory and Executive Engineers British Electrical and Allied Manufacturers Association* British Radio Equipment Manufacturers Association British Railways Board Crown Agents for Oversea Government and Administrations Department of Employment and Productivity Electric Cable
6、 Makers Confederation* Electrical Contractors Association, Incorporated Electrical Contractors Association of Scotland Electrical Research Association Electricity Council, The Central Electricity Generating Board and the Area Boards in England and Wales* Electronic Engineering Association Engineerin
7、g Equipment Users Association Institution of Electrical Engineers Lighting Industry Federation Ltd. Ministry of Defence Ministry of Defence, Army Dept. Ministry of Defence, Navy Dept. Ministry of Power Ministry of Public Building and Works Ministry of Technology* Municipal Passenger Transport Associ
8、ation, Incorporated National Inspection Council for Electrical Installation Contracting National Physical Laboratory (Ministry of Technology) Oil Companies, Materials Association Post Office Public Transport Association Incorporated South of Scotland Electricity Board The Government department and s
9、cientific and industrial organizations marked with an asterisk in the above list, were directly represented on the committee entrusted with the preparation of this British Standard. Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Fri Dec
10、01 01:48:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4579-1:1970 BSI 01-1999i Contents Page Co-operating organizationsInside front cover Forewordii 1Scope1 2Definitions1 3Test specimens1 4Sequence of tests1 5Test procedure1 6Requirements2 7Test certificates3 Figure 1 Method of determining joint
11、 resistance4 Figure 2 Typical assemblies for tensile test5 Table 1 Minimum test current2 Table 2 Percentage of conductor breaking load3 Table 3 Resistance values3 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 01:48:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4579-1:1970 ii BSI 01-1999
12、Foreword In order to keep abreast of progress in the industries concerned, British Standards are subject to periodical review. Suggestions for improvements will be recorded and in due course brought to the notice of the committees charged with the revision of the standards to which they refer. A com
13、plete list of British Standards, numbering over 9,000, fully indexed and with a note of the contents of each, will be found in the BSI Catalogue which may be purchased from BSI Sales Department. The Catalogue may be consulted in many public libraries and similar institutions. This standard makes ref
14、erence, to the following British Standards: BS 3288, Insulator and conductor fittings for overhead power lines. BS 6207, Mineral-insulated cables. Part. 1: Copper-sheathed cables with copper conductor. BS 6360, Specification for conductors in insulated cables and cords. 4G. 178, Crimped joints for a
15、ircraft electrical cables and wires Part 1: Specification for design requirements (including tests) for components and tools. This British Standard has been prepared under the authority of the Electrical Industry Standards Committee, and is based on proposals submitted by the British Electrical and
16、Allied Manufacturers Association. Part 1 of the standard is concerned with compression jointing of copper conductors. Further parts of this standard will apply to cable and wire connectors for use with aluminium conductors and plated copper, nickel and iron conductors (high temperature applications)
17、. 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 documents compris
18、es a front cover, an inside front cover, pages i and ii, pages 1 to 5 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: sheffieldun sheffieldun, na, F
19、ri Dec 01 01:48:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4579-1:1970 BSI 01-19991 1 Scope This Part of the standard specifies requirements for the performance of compression joints in electric cable and wire connectors manufactured from copper or copper alloys for use with copper conductors
20、in accordance with BS 63601) and BS 62072). The conductors for which the connectors may be suitable may be tinned or untinned, stranded or solid and have an operating temperature up to 85 C. This Part of the standard does not apply to joints on or within electrical equipment where the joint temperat
21、ure may exceed 85 C, joints conforming to British Standard 4G.178-13) or fittings required to comply with BS 32884). 2 Definitions For the purposes of this Part of this British Standard the following definitions apply: 1) Connector. A lug, tag, ferrule or other device with a barrel or socket at one
22、or both ends to accommodate an electrical conductor with or without additional provision to secure the insulation. 2) Compression jointing. A method of firmly attaching a connector to a conductor, by pressure-forming or re-shaping the barrel in association with the conductor, to establish good elect
23、rical and mechanical contact. 3) Joint. The connector barrel and that portion of the conductor which have been brought into intimate contact by the compression jointing process. 4) Test specimen. A length of uninsulated copper conductor terminated at both ends by means of joints of the same type. Fo
24、r the purposes of this definition, a ferrule is taken as having two joints. 3 Test specimens 3.1 Preparation. The conductor shall be prepared and the joint shall be formed with the tools and in accordance with the instructions and drawings of the connector manufacturer. In the case of ferrules, care
25、 shall be taken to ensure that the ends of the conductors are not in direct contact. (See Figure 1.) 3.2 Number. Six similar specimens shall be prepared for each type and size of joint. When a connector has a barrel declared to accept a range of conductors there shall be six specimens of both the sm
26、allest and largest sizes of conductor in the declared range for any particular compression tool or die. 3.3 Length. The shortest practicable free length of conductor should be used (see Figure 1), but shall be not less than that shown below: 4 Sequence of tests Before the tests are made, the testing
27、 organization shall satisfy itself that the test specimens comply with Clause 3. Tests on each specimen shall be made in the sequence given below: 1) Initial resistance measurement by procedure stated in 5.1. 2) Temperature cycling by procedure stated in 5.2. 3) Final resistance measurement by proce
28、dure stated in 5.1. 4) Tensile strength test by procedure stated in 5.3. 5 Test procedure 5.1 Resistance measurement. The resistance of each specimen shall be ascertained by the use of two probes. In the case of a lug or tag the probes shall be placed on the intersection of the palm and the barrel a
29、s shown in Figure 1(a). In the case of a ferrule, the probe shall be placed at the mid point as shown in Figure 1(b). In both cases, care shall be taken to ensure that the probes do not touch the ends of the conductor. The resistance per unit length of the conductor to be used during the test shall
30、be ascertained using as long a length as is reasonably practicable. 1) BS 6360, “Specification for conductors in insulated cables and cords”. 2) BS 6207, “Mineral-insulated cables”, Part 1, “Copper-sheathed cables with copper conductors”. 3) 4G. 178, “Crimped joints for aircraft electrical cables an
31、d wires”, Part 1, “Specification for design requirements (including tests) for components and tools”. 4) BS 3288, “Insulator and conductor fittings for overhead power lines”. Conductors up to but excluding 95 mm2 cross-sectional area: 150 mm Conductors of 95 mm2 and up to and including 1 000 mm2 cro
32、ss-sectional area: 300 mm Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 01:48:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4579-1:1970 2 BSI 01-1999 For the purpose of the test, the joint resistance shall be regarded as that determined by subtracting from the specimen resistance the res
33、istance of the free length of conductor between the joints and then dividing the result by two. The devices and instruments used for resistance measurement shall have an error of 1 % or less, and the through-current used by the instrument shall be such that it does not materially affect the temperat
34、ure of the test specimen. All initial and final resistance measurements shall be taken at any convenient temperature between 15 C and 25 C. 5.2 Temperature cycling 5.2.1 All test specimens shall be subjected to temperature cycling, a cycle comprising a “heat on” period followed by a “heat off” perio
35、d. 5.2.2 During the “heat on” period, the temperature of the conductor in the specimen shall be raised to a minimum temperature of 90C and held at or above this temperature for not less than 5 min. 5.2.3 The “heat off” period shall be of sufficient duration to allow the specimen to cool to a tempera
36、ture of less than 30C; during this period the current shall be switched off. Accelerated cooling by artificial means is permissible. 5.2.4 The required temperature may be attained by current heating or by current heating in association with oven heating. The minimum test current shall be as given in
37、 Table 1. The test current may be varied between 1 and 4 times the minimum value. Where the required conductor temperature is to be obtained by means of current plus oven heating, the heating attributable to the oven shall not raise the conductor to a temperature greater than 50C. The balance of hea
38、t required shall be produced by current heating. 5.2.5 All specimens shall be subjected to a minimum of 500 temperature cycles and resistance measurements shall be taken at approximately 50 cycle intervals. 5.3 Tensile strength test 5.3.1 The axial pull shall be applied by separating the jaws of the
39、 tensile testing machine at a steady rate between 25 mm/min and 50 mm/min. For the purpose of tensile tests on ferrules it is permissible to carry out the test on an assembly of one ferrule joining two unterminated lengths of conductor (see Figure 2). 5.3.2 Subclause 5.3.1 states that the load shoul
40、d be applied axially. Alternatively, for terminations, it is permissible to apply a longitudinal pull on the palm of the connector. 6 Requirements 6.1 Joint resistance 6.1.1 Initial value. The initial value of resistance of any joint, with the exception of joints in specimens incorporating conductor
41、s up to and including 10 mm2 cross-sectional area, shall not exceed the resistance of a length of conductor equal to twice the length of the compression barrel (dimension l in Figure 1). In the case of a specimen incorporating a conductor up to and including 10 mm2 cross-sectional area, the initial
42、value of resistance shall not exceed the appropriate value given in Table 3. 6.1.2 Stability. During the last 200 temperature cycles successive resistance measurements shall show that stable conditions have been maintained. Table 1 Minimum test current Size mm2 1152546101625355070 Minimum test curre
43、nt A 162129475980105145175245305 Size mm2 951201501852403004005006308001 000 Minimum test current A 3804455105907208209501 0701 220 1 370 1 520 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 01:48:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4579-1:1970 BSI 01-19993 6.1.3 Final value. Th
44、e final value of resistance of any joint, with the exception of joints in specimens incorporating conductors up to and including 10 mm2 cross-sectional area, shall not exceed the initial resistance by more than either 50 % or 5 , whichever is the greater. In the case of a specimen incorporating a co
45、nductor up to and including 10 mm2 cross-sectional area, the final value of resistance shall not exceed the appropriate value given in Table 3. 6.2 Tensile strength. For the purposes of this test the breaking load of the conductor shall be taken as either that stated by the conductor manufacturers o
46、r that established under laboratory conditions. Specimens which withstand the appropriate test load, calculated from this conductor breaking load and the percentages given in Table 2, shall be deemed to have met the requirements. 6.3 Retests. If, during the course of tests, one or more specimens fai
47、l, a further twelve similar specimens shall be tested. The connector is only considered to have passed the test if all twelve specimens pass. 7 Test certificates The manufacturer shall, upon request, issue certificates as evidence that the type tests have been satisfactorily performed on connectors
48、identical in all essential details with those to be supplied. Such certificates shall be accepted as evidence of compliance with the test requirements of this standard. Table 2 Percentage of conductor breaking load Table 3 Resistance values Percentage of conductor breaking load Conductors to BS 6360
49、:1981a Conductor cross-sectional areaClass 2 conductors to Table 2 Class 1, 5 and 6 conductors to Table 1, 3 and 4 Conductors in cables to BS 6207-1b % Up to and including 5.0554040 Above 5.0, up to and including 50503030 Above 50, up to and including 95402525 Above 95, up to and including 1 000302020 a BS 6360, “Specification for conductors in insulated cables and cords”. b BS 6207, “Mineral-insulated cables”, Part 1. “Copper-sheathed cables with copper conductors”. Size mm2 Initial resistance m max. Final resistance m max. Up to and inclu