BS 7870-8 2-2003 LV and MV polymeric insulated cables for use by distribution and generation utilities - Specification for multicore and multipair cables for installation above and.pdf

1、BRITISH STANDARD BS 7870-8.2:2003 LV and MV polymeric insulated cables for use by distribution and generation utilities Part 8: Specification for multicore and multipair cables for installation above and below ground Section 8.2: Single wire armoured and PVC sheathed multipair cable with copper cond

2、uctors (Implementation of part of HD 627) ICS 29.060.20 BS 7870-8.2:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 16 June 2003 BSI 16 June 2003 The following BSI references relate to the work on this British Standard: Committee referen

3、ce GEL/20/16 Draft for comment 99/244662 DC ISBN 0 580 37568 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee GEL/20, Cables, to Subcommittee GEL/20/16, Medium/high voltage cables, upon which the following bodies were re

4、presented: British Approval Service for Cables British Cables Association British Plastics Association Electricity Association ERA Technology Co-opted members Amendments issued since publication Amd. No. Date CommentsBS 7870-8.2:2003 BSI 16 June 2003 i Contents Page Committees responsible Inside fro

5、nt cover Foreword ii 1S c o p e 1 2 Normative references 1 3 Rated voltage 1 4C o n d u c t o r s 1 5 Insulation 1 6 Identification of pairs 2 7 Assembly of pairs, fillers and binders 3 8 Bedding layer 3 9A r m o u r i n g 3 10 Oversheath 3 11 Marking 4 12 Dimensions 5 13 Tests 8 14 Routine tests 8

6、15 Sample tests 9 16 Type tests 11 Annex A (informative) Guide to use 14 Annex B (normative) Compatibility of filling materials 16 Annex C (normative) Water penetration test 17 Bibliography 19 Figure C.1 Water penetration test arrangement 17 Table 1 Multipair cables with steel wire armouring where i

7、nduced voltage does not exceed 5 kV 6 Table 2 Multipair cables with steel wire armouring where induced voltage does not exceed 15 kV 6 Table 3 Polyethylene-insulated, multipair cables for use where the induced voltage would otherwise exceed 15 kV (aluminium wire armoured) 7 Table 4 Schedule of tests

8、 8 Table 5 Group insulation resistance 9 Table 6 Diameter of armour wire 11 Table 7 Requirements for non-electrical tests on polyethylene 12 Table 8 Mass of zinc coating 12 Table 9 Requirements for capacitance 13BS 7870-8.2:2003 ii BSI 16 June 2003 Foreword This section of BS 7870 has been prepared

9、by Subcommittee GEL/20/16, under the direction of Technical Committee GEL/20. BS 7870 implements the nationally applicable parts of Harmonization Documents HD 603, HD 604, HD 605, HD 620, HD 622, HD 626 and HD 627 published by the European Committee for Electrotechnical Standardization (CENELEC) in

10、accordance with the decision of the CENELEC Technical Board. BS 7870 applies to cables for fixed installations having a rated voltage U 0 /U up to and including 19/33 kV, and is published as a series of separate parts and sections, as listed in the table in the foreword of BS 7870-1. BS 7870-8.2 imp

11、lements HD 627-3A2 and is to be read in conjunction with BS 7870-1 and BS 7870-2. It has been assumed in the preparation of this British Standard that the execution of its provisions will be entrusted to appropriately qualified and experienced people, for whose use it has been produced. WARNING. Thi

12、s British Standard calls for procedures that may be injurious to health if adequate precautions are not taken. It refers only to technical 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

13、 necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of 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 19 and a bac

14、k cover. The BSI copyright notice displayed in this document indicates when the document was last issued.BS 7870-8.2:2003 BSI 16 June 2003 1 1 Scope This section of BS 7870 specifies requirements for the construction, dimensions and mechanical and physical properties of multipair polyethylene insula

15、ted, PVC sheathed cables. It specifies requirements for multipair cables (4 pairs to 61 pairs) having copper conductors with filled and unfilled interstices, normal and increased insulation and bedding thicknesses and either steel or aluminium wire armour. This section of BS 7870 is applicable to ca

16、bles for use underground in wet conditions and also for withstanding high levels of induced voltage. NOTE A “guide to use” is given in Annex A. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cit

17、ed applies. For undated references, the latest edition of the referenced document (including any amendments) applies. BS 6360, Specification for conductors in insulated cables and cords. BS EN 60811-4-2:2000, Insulating and sheathing materials of electric and optical fibre cables Common test methods

18、 Part 4-2: Methods specific to polyethylene and polypropylene compounds Tensile strength and elongation at break after pre-conditioning Wrapping test after thermal ageing in air Measurement of mass increase Long-term stability test Test method for copper-catalysed oxidative degradation. BS 7655-4.1,

19、 Specification for insulating and sheathing materials for cables Part 4: PVC sheathing compounds Section 4.1: Harmonized types. BS 7870-1, LV and MV polymeric insulated cables for use by distribution and generation utilities Part 1:General. BS 7870-2:1999, LV and MV polymeric insulated cables for us

20、e by distribution and generation utilities Part 2: Methods of test. BS EN 60811-1-1:1995, Insulating and sheathing materials of electric cables Common test methods Part 1-1: General application Measurement of thickness and overall dimensions Tests for determining the mechanical properties. BS EN 608

21、11-1-3:1995, Insulating and sheathing materials of electric cables Common test methods Part 1-3: General application Methods for determining the density Water absorption tests Shrinkage test. BS EN 60811-4-1:1995, Insulating and sheathing materials for electric cables Common test methods Part 4-1: M

22、ethods specific to polyethylene and polypropylene compounds Resistance to environmental stress cracking Wrapping test after thermal ageing in air Measurement of the flow index Carbon black and/or mineral content measurement in PE. IEC 60189-1:1986, Low-frequency cables and wires with p.v.c. insulati

23、on and p.v.c. sheath Part 1: General test and measuring methods. 3 Rated voltage The rated voltage of cables in this standard is 100 V a.c. or 150 V d.c. 4 Conductors Conductors shall be of plain copper wire consisting of a single strand of 0.8 mm nominal diameter, conforming to the requirements of

24、BS 6360. Conformity shall be checked by visual examination as specified in 15.2. 5 Insulation The insulation shall be polyethylene type TI Y conforming to the requirements specified in Table 7. The insulation shall be applied so that it fits closely on the conductor and it shall be possible to remov

25、e it without damage to the insulation itself or to the conductor.BS 7870-8.2:2003 2 BSI 16 June 2003 The insulation shall be applied by a suitable extrusion process and shall form a compact and homogenous body. The thickness of the insulation shall conform to the requirements specified in Table 1, T

26、able 2 and Table 3. Conformity shall be checked by the test methods specified in 15.3. 6 Identification of pairs The pairs shall be identified by colours in the following sequence. a) 4-pair cable: black/violet; red/yellow; green/brown; blue/white; b) 7-pair cable: 1) centre pair: red/yellow; 2) out

27、er layer: black/violet; orange/grey 1) ; green/brown; orange/blue 1) ; green/brown; orange/white 1) ; c) 19-pair cable: 1) centre pair and first layer: as 7-pair above; 2) outer layer: black/violet; odd pairs: red/yellow; even pairs: green/brown; blue/white; d) 37-pair cable: 1) centre pair, first a

28、nd second layers: as 19-pair above; 2) outer layer: black/violet; odd pairs: red/yellow; even pairs: green/brown; blue/white; e) 61-pair cable: 1) centre pair, first, second and third layers: as 37-pair above; 2) outer layers: black/violet; odd pairs: red/yellow; even pairs: green/brown; blue/white.

29、 Conformity shall be checked by visual examination as specified in 15.5. 1) Nominated pairs designed for use at carrier frequencies in the range 12 kHz to 108 kHz.BS 7870-8.2:2003 BSI 16 June 2003 3 7 Assembly of pairs, fillers and binders Cables shall be twinned with a maximum lay length of 150 mm.

30、 The lengths of lay of adjacent pairs shall meet all the electrical requirements. All laid-up assemblies shall be bound with a suitable tape or tapes applied with an overlap. Where cables are required to be filled, a suitable compound having a nominal drop point of not less than 55 C shall be used.

31、8 Bedding layer The bedding shall be an extruded layer of polyethylene compounds type TM Y, conforming to the requirements specified in Table 1, Table 2 and Table 3. 9 Armouring The armouring shall consist of a single layer of galvanized steel or aluminium wires, conforming to the requirements speci

32、fied in Table 1, Table 2 and Table 3, applied in the opposite direction to the outer layer of pairs. Joints in aluminium wire armour shall be cold pressure or fusion welded. Joints in steel wire armour shall be brazed or welded and any surface irregularity shall be removed. Any joint in any wire sha

33、ll be not less than 1 m from the nearest joint in any other armour wire in the complete cable. NOTE A layer of waterproof compound may be applied over the wires by agreement between the manufacturer and the purchaser. 10 Oversheath The oversheath shall be an extruded layer of black PVC compound type

34、 TM 1, conforming to the requirements of BS 7655-4.1. When required by the purchaser an outer semi-conducting coating shall be applied to serve as an electrode for a voltage test on the oversheath.BS 7870-8.2:2003 4 BSI 16 June 2003 11 Marking 11.1 External marking The external surface of the cable

35、shall be legibly marked with the following elements: 2) The marking shall be by indenting or embossing on the oversheath. For cables with tabulated 3)approximate overall diameters greater than 15 mm, elements a), b) and c) shall appear, in any sequence that is deemed neither to confuse nor to confli

36、ct, on two or more primary lines along the axis of the cable, approximately equally spaced around the circumference of the cable. Element d) shall appear upon at least one line, which may be one of the primary lines or a secondary line. For cables with tabulated 3)approximate overall diameters of 15

37、 mm or less, the elements shall be arranged as for cables of greater than 15 mm diameter, except that the marking for elements a), b) and c) shall appear on one or more primary lines. The letters and figures shall consist of upright block characters. The characters shall have a minimum height of 3 m

38、m. 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 elements a), b) and c) and not greater than 1 100 mm for element d). Conformity shall be checked by visual examination and measurement as specified in 14.7.

39、11.2 Identification of year of manufacture A means of identifying the year of manufacture of the cable shall be provided throughout the length of the cable, either internally or by use of an identification thread or externally by marking on the surface of the cable. If the identification is internal

40、, the distance between the end of one mark and the beginning of the next mark shall be not greater than 550 mm. If the identification is by marking on the external surface, the distance between the end of one element of marking and the beginning of the next identical element shall be not greater tha

41、n 1 100 mm. Conformity shall be checked by visual examination and measurement as specified in 14.7. 11.3 Mark of an approval organization If the mark of an approval organization is used, it shall be provided throughout the length of the cable, either as an identification thread or by marking on the

42、external surface of the cable, as specified by the approval organization. If the mark is on the external surface of the cable, it shall be in the form of the symbol(s) specified by the approval organization, and the distance between the end of one element of marking and the beginning of the next ide

43、ntical element shall be not greater than 1 100 mm. Conformity shall be checked by visual examination and measurement as specified in 14.7. 2) Marking BS 7870-8.2:2003 on or in relation to a product represents a manufacturers declaration of conformity, i.e. a claim by or on behalf of the manufacturer

44、 that the product meets the requirements of the standard. The accuracy of the claim is solely the claimants responsibility. Such a declaration is not to be confused with third-party certification of conformity. Element Example of marking a) Electric cable ELECTRIC CABLE b) Voltage designation 1) For

45、 unfilled cables TELE 2) For filled cables TELE F c) British Standard number 2) BS 7870-8.2 d) Manufacturers identification XYZ 3) See Table 1.BS 7870-8.2:2003 BSI 16 June 2003 5 11.4 Additional marking Where additional marking is made, it shall be throughout the length of the cable, and on the exte

46、rnal surface of the cable, or by means of a tape or thread within the cable, or by a combination of these methods. If the additional marking is applied to the surface of the cable, it shall not render illegible the marking specified in 11.1, 11.2 and 11.3. The additional marking, however made, shall

47、 be repeated at intervals not exceeding 1 100 mm. Conformity shall be checked by visual examination and measurement as specified in 14.7. 12 Dimensions The dimensions of the component layers shall be as specified in Table 1, Table 2 and Table 3.BS 7870-8.2:2003 6 BSI 16 June 2003 Table 1 Multipair c

48、ables with steel wire armouring where induced voltage does not exceed 5 kV Table 2 Multipair cables with steel wire armouring where induced voltage does not exceed 15 kV Dimensions in millimetres Cable type Conductor Thickness of insulation Thickness of bedding Diameter Thickness of PVC oversheath O

49、verall diameter a No. of wires Diameter of wires a Min. average Min. at any point Nominal Min. at any point Under bedding a Over bedding a Armour wire a Without graphite coating With graphite coating Without graphite coating With graphite coating Nominal Min. at any point Nominal Min. at any point 4-pair 1 0.8 0.5 0.38 0.8 0.58 7.9 9.5 0.9 1.4 0.92 1.8 1.24 14.1 14.9 7-pair 1 0.