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1、BRITISH STANDARD BS 7889:1997 Incorporating Amendments Nos. 1, 2 and 3 and Corrigendum No. 1 Electric cables Thermosetting insulated, unarmoured cables for a voltage of 600/1 000 V ICS 29.060.20 ? Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:10:59 GMT+00:0
2、0 2006, Uncontrolled Copy, (c) BSI BS 7889:1997 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 October 1997 BSI 29 April 2005 The following BSI references relat
3、e to the work on this standard: Committee reference GEL/20 Draft for comment 96/20306 DC ISBN 0 580 27966 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee GEL/20, Electric cables, upon which the following bodies were rep
4、resented: Association of Consulting Engineers Association of Manufacturers of Domestic Electrical Appliances BEAMA Electrical Cable and Conductor Accessory Manufacturers Association British Approvals Service for Cables British Cables Association British Iron and Steel Producers Association British P
5、lastics Federation Department of Trade and Industry (Consumer Safety Unit, CA Division) Electricity Association London Transport The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Association of Manufacturers Allied to the Electrical and Ele
6、ctronic Industry (BEAMA Ltd.) Chartered Institution of Building Services Engineers ERA Technology Ltd. Electrical Installation Equipment Manufacturers Association (BEAMA Ltd.) Engineering Industries Association Institution of Incorporated Executive Engineers London Underground Ltd. National Associat
7、ion of Lift Makers Portable Electric Tool Manufacturers Association Transmission and Distribution Association (BEAMA Ltd.) Amendments issued since publication Amd. No.DateComments 10095July 1998See foreword 142055 February 2004Revised title and see foreword 15053 Corrigendum No. 1 19 March 2004Corre
8、ction to foreword 1565729 April 2005See foreword Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:10:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7889:1997 BSI 29 April 2005 i Contents Page Committees responsibleInside front cover Forewordii 1Scope 1 2Norm
9、ative references 1 3Terms and definitions 2 4Voltage designation 2 5Conductors 3 6Insulation 3 7Identification of cores 3 8Oversheath 3 9Cable marking 4 10End sealing 5 11Schedule of tests 5 12Test conditions 5 13Routine tests 6 14Sample tests 6 15Type tests 6 Annex A (informative) Recommendations f
10、or the selection and operation of cables 8 Annex B (informative) Recommendations for the installation of cables 9 Annex C (informative) Information to be provided with enquiry or order 10 Annex D (normative) Measurement of thickness 10 Annex E (normative) Voltage test on completed cables 11 Annex F
11、(normative) Compatibility test 11 Annex G (informative) Notes on type tests 12 Annex H (informative) Guide to use 13 Table 1 Schedule of tests 5 Table 2 Compatibility test requirements 6 Table 3 Single-core 600/1 000 V cables with circular stranded copper conductor 7 Table 4 Single-core 600/1 000 V
12、cables with solid aluminium conductor 7 Table A.1 Selection of cables for a.c. systems 8 Table B.1 Minimum installation radius 9 Table E.1 Spark test voltages 11 Bibliography15 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:10:59 GMT+00:00 2006, Uncontrolled
13、 Copy, (c) BSI BS 7889:1997 ii BSI 29 April 2005 Foreword This British Standard has been prepared by Technical Committee GEL/20. BS 7889 is related to but not equivalent to IEC 60502-1:1998. The start and finish of text introduced or altered by amendment is indicated in the text by tags !“. Tags ind
14、icating changes to text carry the number of the amendment. For example, text altered by amendment No. 1 is indicated by !“. It is the first edition of this British Standard, which has been produced to specify the requirements for single-core 600/1 000 V cables having thermosetting insulation and PVC
15、 sheaths. These cables were previously specified in BS 5467, but have been deleted from the scope of that standard so that the specific requirements can be more clearly defined and presented. Amendment No. 2:2004 implements the changes to the identification of cores by colours, in accordance with HD
16、 308 S2. The principal identification colours are now: Single phase Green-and-yellow (Earth); blue (Neutral); brown (Live); Three phase Green-and-yellow (Earth); blue (Neutral); brown, black, grey (Live). Users should ensure that any interconnection between cables with these new colours and those wi
17、th the pre-existing ones is carried out safely. BS 7671, as amended in parallel with this standard, gives some guidance in this respect, but does not cover all installation conditions or cable uses. The provisions introduced by amendment No. 2:2004 are effective from 1st April 2004. The original ver
18、sion of this standard remains current until 31st March 2006. Product certification/inspection/testing. Users of this British Standard are advised to consider the desirability of third-party certification/inspection/testing of product conformity with this British Standard. Users seeking assistance in
19、 identifying appropriate conformity assessment bodies or schemes may ask BSI to forward their enquiries to the relevant association. WARNING. This standard calls for the use of substances and/or procedures that may be injurious to health if adequate precautions are not taken. It refers only to techn
20、ical suitability and does not absolve the user from legal obligations relating to health and safety at any stage. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of
21、 itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 15 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Licensed Copy: London South
22、Bank University, London South Bank University, Fri Dec 08 12:10:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7889:1997 BSI 29 April 2005 1 1 Scope This British Standard specifies requirements for construction and describes methods of test for unarmoured single-core cables with thermosetting insu
23、lation of rated voltage 600/1 000 V. Cables specified in this standard are intended for use in fixed installations in industrial areas, buildings and similar applications but not for direct burial in the ground. The insulation and other components are suitable to permit operation of the cables at a
24、maximum sustained conductor temperature of 90 C and for a maximum short-circuit conductor temperature of 250 C. NOTE 1 Limitation on the temperature of the cables may be imposed in situations where they may be touched. NOTE 2 In installations which include cable joints and terminations, the performa
25、nce of these accessories should be taken into account in deciding the maximum operating temperature of the cable. Annex A gives recommendations for the selection and operation of cables while recommendations for the installation of cables are given in Annex B. Annex C lists the information that shou
26、ld be given with an enquiry or order. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendment
27、s) applies. #Text deleted$ BS 4727-2-08:1994, Glossary of electrotechnical, power, telecommunication, electronics, lighting and colour terms Terms particular to power engineering Electric cables. BS 5099:1992, Specification for spark testing of electric cables. BS 6360:1991, Specification for conduc
28、tors in insulated cables and cords. BS 7655-1-2:1993, Specification for insulating and sheathing materials for cables Elastomeric insulating compounds General 90 C application. BS 7655-1-3:1993, Specification for insulating and sheathing materials for cables Elastomeric insulating compounds XLPE. BS
29、 7655-4-2:1993, Specification for insulating and sheathing materials for cables PVC sheathing compounds General application. #BS EN 50265-2-1, Common test methods for cables under fire conditions Test for resistance to vertical flame propagation for a single insulated conductor or cable Part 2-1: Pr
30、ocedures 1 kW pre-mixed flame. BS EN 50356, Method for spark testing of cables.$ BS EN 60811-1-1:1995, Insulating and sheathing materials of electric cables Common test methods Measurement of thickness and overall dimensions. Tests for determining the mechanical properties. BS EN 60811-1-2:1995, Ins
31、ulating and sheathing materials of electric cables Common test methods Thermal ageing methods. BS EN 60811-1-3:1995, Insulating and sheathing materials of electric cables Common test methods Methods for determining the density. Water absorption tests. Shrinkage test. Licensed Copy: London South Bank
32、 University, London South Bank University, Fri Dec 08 12:10:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7889:1997 2 BSI 29 April 2005 3 Terms and definitions For the purposes of this British Standard the definitions given in BS 4727:Part 2:Group 08 apply together with the following: 3.1 rated v
33、oltage U0 The nominal power-frequency voltage between conductor and earth for which the cable is suitable. 3.2 rated voltage U The nominal power-frequency voltage between phase conductors for which the cable is suitable. 3.3 maximum voltage Um The maximum sustained power-frequency voltage between ph
34、ase conductors for which the cable is suitable. 3.4 nominal value The value by which a quantity is designated and which is often used in tables. NOTE In this standard, nominal values usually give rise to values to be checked by measurements taking into account specified tolerances. 3.5 approximate v
35、alue A value which is only indicative. NOTE In this standard, values described as approximate do not constitute requirements to be checked by measurement. 3.6 type tests (symbol T) Tests required to be made before supplying a type of cable specified in this standard, on a general commercial basis, i
36、n order to demonstrate satisfactory performance characteristics to meet the intended application. These tests are of such a nature that, after they have been made, they need not be repeated unless changes are made in the cable material, design or type of manufacturing process which might change the
37、performance characteristics. 3.7 sample tests (symbol S) Tests made on samples of completed cable, or components taken from a completed cable adequate to verify that the finished product meets the design specifications. 3.8 routine tests (symbol R) Tests made on all production lengths to demonstrate
38、 their integrity. 3.9 tests after installation Tests intended to demonstrate the integrity of the cable and its accessories as installed. 4 Voltage designation The cables shall be designated by the rated voltages U0 and U, expressed in the form U0/U. The rated voltage recognized for the purposes of
39、this standard is 600/1 000 V. The maximum designated voltage (Um) for the purposes of this standard for 600/1 000 V cables is recognized as 1 200 V. NOTE Guidance on the selection of cables for particular systems is given in A.2. Licensed Copy: London South Bank University, London South Bank Univers
40、ity, Fri Dec 08 12:10:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7889:1997 BSI 29 April 2005 3 5 Conductors The conductors shall be either annealed copper or solid aluminium, as given in Table 3 and Table 4, and shall conform to the requirements detailed in Table 1 and to BS 6360. Where the ma
41、nufacturer deems it necessary to use tinned copper conductors, they shall conform to the requirements of BS 6360 for metal coated conductors. The conductors shall be circular, circular sectoral (class 1), or circular, circular compacted (class 2), as specified in Table 3 and Table 4. 6 Insulation 6.
42、1 General The insulation shall be either cross-linked polyethylene (GP 8) or ethylene propylene rubber (GP 6) conforming to BS 7655:Section 1.3 or Section 1.2 respectively. The insulation shall be applied by the extrusion process and cross-linked to form a compact and homogeneous layer. The manufact
43、urer shall, where necessary to meet the compatibility requirements specified in 15.2, apply a protective barrier between the conductor and the insulation and/or over the insulation. This barrier shall not be included as part of the insulation thickness. 6.2 Thickness of insulation The thickness of i
44、nsulation, when determined by taking the average of a number of measurements in accordance with Annex D, shall be not less than the value given in Table 3 and Table 4, as appropriate, and the smallest of the measured values shall not fall below the value given in Table 3 and Table 4, as appropriate,
45、 by more than (10 % + 0.1 mm). 6.3 Spark testing of insulation The core insulation shall conform to the requirements for spark testing specified in BS 5099 when tested in accordance with the a.c. or d.c. test methods specified in that standard. 7 Identification of cores 7.1 General #The core shall b
46、e identified by the colours brown or blue either throughout the insulation or on its external surface.$ 7.2 Spare 7.3 Clarity and durability The colour used for core identification shall be clearly identifiable and durable. Conformity shall be checked by trying to remove the colour of the core by ru
47、bbing the core 10 times with a piece of cotton wool or cloth soaked in water. 8 Oversheath 8.1 General The oversheath shall be an extruded layer of PVC material conforming to the requirements for Type 9 specified in BS 7655:Section 4.2. It shall be possible to remove the oversheath without damaging
48、the insulation of the core. NOTE Oversheaths are normally black, but colours other than black may be provided by agreement between the manufacturer and the purchaser, subject to their suitability for the particular exposure conditions in which the cables are to be used. 8.2 Thickness of oversheath #
49、The minimum thickness of the oversheath, when measured in accordance with Annex D, shall not fall below the value given in Table 3 and Table 4, as appropriate, by an amount exceeding (15 % + 0.1 mm).$ Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:10:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7889:1997 4 BSI 29 April 2005 9 Cable marking 9.1 External marking The external surface of all cables confo
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