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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS 7870 : Section 3.4 : 1
2、996 Incorporating Amendment No. 1 ICS 29.060.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW LV and MV polymeric insulated cables for use by distribution and generation utilities Part 3. Specification for distribution cables of rated voltage 0.6/1 kV Section 3.4 XLPE and HE
3、PR insulated combined neutral and earth aluminium or copper wire concentric cables with solid aluminium conductors (Implementation of HD 603) Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:03:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI This British Standar
4、d, 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 December 1996 BSI 1997 The following BSI references relate to the work on this standard: Committee reference GEL/20/2 Draft announced
5、 in BSI Update November 1995 ISBN 0 580 26724 5 BS 7870 : Section 3.4 : 1996Issue 2, June 1997 Amendments issued since publication Amd. No.DateText affected 9453June 1997Indicated by a line in the margin Committees responsible for this British Standard The preparation of this British Standard was en
6、trusted by Technical Committee GEL/20, Electric cables, to subcommittee GEL/20/2, Mains cables 1kVand above, upon which the following bodies were represented: Association of Consulting Engineers British Approvals Service for Cables British Cable Makers Confederation British Iron and Steel Producers
7、Association British Plastics Federation ERATechnology Ltd. Electricity Association Engineering Equipment and Materials Users Association Institution of Incorporated Executive Engineers London Underground Ltd. British Railways Board British Steel Industry Licensed Copy: London South Bank University,
8、London South Bank University, Fri Dec 08 12:03:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Issue 1, June 1997BS 7870 : Section 3.4 : 1996 BSI 1997a Summary of pages The following table identifies the current issue of each page. Issue 1 indicates that a page has been introduced for the first time b
9、y amendment. Subsequent issue numbers indicate an updated page. Vertical sidelining on replacement pages indicates the most recent changes (amendment, addition, deletion). PageIssuePageIssue Front cover Inside front cover a b i ii 2 2 1 blank original original 1 to 7 8 9 10 Inside back cover Back co
10、ver original 2 original blank original original Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:03:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI bblank Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:03:22 GMT+00:00 20
11、06, Uncontrolled Copy, (c) BSI BS 7870 : Section 3.4 : 1996 BSI 1996i Contents Page Committees responsibleInside front cover Forewordii Specification 1Scope1 2References1 3Voltage designation1 4Phase conductors1 5Insulation1 6Assembly of cores1 7Concentric neutral/earth conductor1 8Oversheath2 9Cabl
12、e markings2 10Tests3 11Additional requirements3 12Sealing and drumming4 Tables 1Schedule of tests5 2Spark test voltages6 3Single-phase cables (aluminium concentric neutral/earth)6 4Three-phase cables (aluminium concentric neutral/earth7 5Three-phase cables (aluminium concentric neutral/earth)7 6Thre
13、e-phase cables (copper wire concentric neutral/earth and single rubber layer)8 7Three-phase cables (copper wire concentric neutral/earth and double rubber layer)8 8Three-phase mains cables (copper wire concentric neutral/earth and double rubber layer)9 9Requirements for compatibility of insulation a
14、nd oversheath9 List of referencesInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:03:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii BSI 1996 BS 7870 : Section 3.4 : 1996 Foreword BS 7870 was prepared by Technical Committee GEL/20 to impleme
15、nt nationally applicable parts of CENELEC Harmonization Documents HD 603, 604, 605, 620, 622, 626 and 627 in accordance with the decision of the CENELEC Technical Board. BS 7870 applies to cables for fixed installations having a rated voltage Uo/U up to and including 19/33kVand is published as a ser
16、ies of separate Parts and Sections, as listed in the table in the foreword of Part 1. Section 3.4 of BS 7870 implements HD 603 Part 5R and Part 7D and is to be read in conjunction with BS 7870 : Parts 1 and 2. The cable types included in this Section are listed below: a)single-core, XLPE insulated,
17、solid aluminium phase conductors with aluminium wire concentric neutral/earth embedded in a double rubber layer (type 5R1); b)three-core, XLPE insulated, circular solid aluminium phase conductors with aluminium wire concentric neutral/earth embedded in a double rubber layer (type 5R2); c)three-core,
18、 XLPE insulated, shaped solid aluminium phase conductors with aluminium wire concentric neutral/earth embedded in a double rubber layer (type 5R3); d)three-core, XLPE insulated, shaped solid aluminium phase conductors with copper wire concentric neutral/earth embedded in a single rubber layer (type
19、5R4); e)three-core, XLPE insulated, circular solid aluminium phase conductors with copper wire concentric neutral/earth embedded in a double rubber layer (type 5R5); f)three-core, XLPE insulated, shaped solid aluminium phase conductors with copper wire concentric neutral/earth embedded in a double r
20、ubber layer (type 5R6) g)single-core, HEPR insulated, solid aluminium phase conductors with aluminium wire concentric neutral/earth embedded in a double rubber layer (type 7D1); h)three-core, HEPR insulated, circular solid aluminium phase conductors with aluminium wire concentric neutral/earth embed
21、ded in a double rubber layer (type 7D2); i)three-core, HEPR insulated, shaped solid aluminium phase conductors with aluminium wire concentric neutral/earth embedded in a double rubber layer (type 7D3); j)three-core, HEPR insulated, shaped solid aluminium phase conductors with copper wire concentric
22、neutral/earth embedded in a single rubber layer (type 7D4); k)three-core, HEPR insulated, circular solid aluminium phase conductors with copper wire concentric neutral/earth embedded in a double rubber layer (type 7D5); l)three-core, HEPR insulated, shaped solid aluminium phase conductors with coppe
23、r wire concentric neutral/earth embedded in a double rubber layer (type 7D6).0 A guide to use for these types of cables is under consideration. It has been assumed in the preparation of this British Standard that the execution of its provisions will be entrusted to appropriately qualified and experi
24、enced people, for whose use it has been produced. WARNING. The methods of test described in this British Standard do not detail all precautions necessary to meet the requirements of the Health and Safety at Work, etc, Act, 1974. Attention should be paid to any appropriate safety precautions and the
25、tests should only be carried by authorized personnel. Compliance with a British Standard does not of itself confer immunity from legal obligations. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:03:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 19961 BS 7
26、870 : Section 3.4 : 1996 Specification 1 Scope This Section of BS 7870 specifies the construction, dimensions and tests for the type of CNE cables having either one or three solid aluminium, polymeric insulated phase conductors and a concentric combined neutral/earth of either aluminium or copper wi
27、res totally embedded in a double rubber layer, or copper wires bedded on a single rubber layer. The cables have an extruded PVC oversheath. The maximum conductor temperature for normal operating conditions is 80 C for XLPE and HEPR insulated cables. The maximum conductor temperature for short circui
28、t conditions is 250 C for XLPE and HEPR insulated cables. 2 References 2.1 Normative references This Section of BS 7870 incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate place in the text and the cited publications
29、 are listed on the inside back page. For a dated reference, only the edition cited applies; any subsequent amendments to or 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 o
30、f the cited publication applies, together with any amendments. 2.2 Informative references This Section of BS 7870 refers to other publications that provide information or guidance. Editions of these publications current at the time of issue of the standard are listed on the inside back page, but ref
31、erence should be made to the latest editions. 3 Voltage Designation Cables are designated by the voltage U0, U and Um expressed in the form U0/U (Um). The voltage designation of cables in this standard is: 0.6/1 (1.2) kV. In an a.c. system, the rated voltage of the cable shall be at least equal to t
32、he nominal voltage of the system for which it is intended. If used in d.c. systems, the cables specified in this standard shall have a maximum voltage against earth not exceeding 1.5kV. 4 Phase conductors The conductors shall be circular or shaped solid aluminium and conform to the requirements for
33、solid conductors (class 1) specified in BS 6360. The d.c. resistance shall conform to the values given in tables 3 to 8. 5 Insulation The insulation of the phase conductors shall be either XLPE type GP 8 conforming to the requirements of BS 7655: Section 1.3, or HEPR type GP 6 conforming to the requ
34、irements of BS 7655 : Section 1.2. Insulation shall be applied by the extrusion process and shall form a compact homogeneous body. The thickness shall conform to the values specified in tables 3 to 8. The cores of all cables shall be identified by colours as follows: a) single-core: red; b) three-co
35、re: red, yellow, blue. The colours shall either be on the external surface or extend throughout the insulation. The colours shall be durable such that when tested in accordance with 2.5.4 of BS 7870 : Part 2 : 1996, they shall not be effaced. 6 Assembly of cores Cores of three-core cables shall be l
36、aid up with a right hand direction of lay. Suitable binder tapes may be applied with an open lay, over the cores, to form a compact assembly. 7 Concentric neutral/earth conductor 7.1 Material The concentric neutral/earth conductor shall consist of either aluminium wires having a maximum tensile stre
37、ngth of 90 N/mm2, in accordance with BS 2627, or plain annealed copper wires with a minimum elongation of 18 %, in accordance with BS 4109. 7.2 Application For cables with an aluminium wire waveform (specified in tables 3, 4 and 5), the wires shall be evenly spaced. Any gap between adjacent wires sh
38、all not exceed 8 mm. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:03:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 BSI 1996 BS 7870 : Section 3.4 : 1996 For cables with copper waveform (specified in tables 6, 7 and 8), the wires shall be applied such tha
39、t the average gap between adjacent wires shall not exceed 4 mm, and at any point the gap shall be a maximum of 8 mm and a minimum of zero. The number and diameter of wires shall conform to the requirements given in the relevant table. The wave length of the waveform lay for a single-core cable shall
40、 be within10 %, and for three-core cables within5 % of the tabulated values given in the relevant table. The developed length of each wire in a wavelength shall be at least 102 % of the tabulated wavelength for single-core cables, and at least 106 % for three-core cables. 7.3 Wires embedded in a dou
41、ble rubber layer The aluminium or copper wires shall be totally enclosed between two layers of soft non-vulcanizable synthetic rubber material which has waterproofing qualities and is compatible with the core insulation and PVC oversheath. The inner covering shall be capable of being easily removed,
42、 and shall fill the outer interstices of three-core cables where these are not covered by binding tape(s). The average total thickness of the double rubber layer shall not fall below the tabulated values by more than 10 %. 7.4 Wires bedded on a single rubber layer (copper wires only) The copper wire
43、s shall be bedded on one layer of soft non-vulcanizable synthetic material which has waterproofing qualities and is compatible with the core insulation and PVC oversheath. The bedding shall be capable of being easily removed and shall fill the outer interstices of the three-core cables where these a
44、re not covered by binding tape(s). The wires shall be partially bedded in the rubber layer and the thickness of the bedding layer under the wires shall be nominally 1 mm. 8 Oversheath The oversheath shall be an extruded layer of black PVC Type TM1 conforming to the requirements of BS 7655 : Section
45、4.1. The thickness of the oversheath shall conform to the values given in tables 3 to 8. 9 Cable markings 9.1 External marking The external surface of all cables conforming to this British Standard shall be legibly marked with the following elements. ElementExample of marking a) Electric cableELECTR
46、IC CABLE b) Voltage designation600/1000V c) British Standard numberBS 00ZZ/3/4 d) Manufacturers identificationXYZ e) Number of cores and nominal area of phase/neutral/earth conductors, e.g. 1) 3 3 70 AL/CU shall indicate a 3-core cable with 70 mm2aluminium phase conductors having a copper concentric
47、 neutral/earth conductor. 2) 3 3 70 AL/AL shall indicate a 3-core cable with 70 mm2aluminium phase conductor having an aluminium concentric neutral/earth conductor. 3) 1 3 35 AL/AL shall indicate a single-core cable with 35 mm2aluminium phase conductor having an aluminium concentric neutral/earth co
48、nductor. The marking of the items a to d shall be by embossing or indenting on the oversheath. Items a), b) and c) shall appear, in any sequence that is deemed neither to confuse nor conflict, on two or more primary lines along the axis of the cable, approximately equally spaced around the circumfer
49、ence of the cable. Items d) and e) shall appear, together or separately, in any sequence that is deemed neither to confuse nor conflict, on either one of the primary lines, or on a secondary line or lines. The letters and figures shall consist of upright block characters. The characters shall have a minimum height of 3 mm. The distance between the end of one element of marking and the beginning of the next identical element shall be not greater than 550 mm for items a), b) and c), and not greater than 1100 mm for items d) and e). Conformity shall be checked by visual examinati
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