BS 7870-8 5-2003 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 7870-8.5:2003 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 8.5: Single wire armoured and unarmoured multicore cables with copper condu

2、ctors and non-halogenated sheath (Implementation of part of HD 627) ICS 29.060.20 BS 7870-8.5:2003 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 S

3、tandard: Committee reference GEL/20/16 Draft for comment 99/244662 DC ISBN 0 580 37571 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 th

4、e following bodies were represented: 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 7870-8.5:2003 BSI 16 June 2003 i Contents Page Committ

5、ees responsible Inside front cover Foreword ii 1S c o p e 1 2 Normative references 1 3 Voltage designation 2 4C o n d u c t o r s 2 5 Insulation 2 6 Identification of cores 2 7 Assembly of cores, fillers and binders 2 8 Bedding layer (optional for unarmoured cables) 2 9A r m o u r i n g 3 10 Overshe

6、ath 3 11 Marking 3 12 Dimensions 4 13 Tests 8 14 Routine tests 9 15 Sample tests 9 16 Type tests 11 Annex A (informative) Guide to use 20 Bibliography 23 Table 1 Construction of 1.5 mm 2multicore XLPE or HEPR insulated armoured cables (Type 1 only) 5 Table 2 Construction of 2.5 mm 2multicore XLPE or

7、 HEPR insulated armoured cable (Type 1 only) 5 Table 3 Construction of 4 mm 2multicore XLPE or HEPR insulated armoured cable (Type 1 only) 5 Table 4 Construction of 1.5 mm 2multicore XLPE or HEPR insulated unarmoured cable (Type 1 only) 6 Table 5 Construction of 2.5 mm 2multicore XLPE or HEPR insula

8、ted unarmoured cable (Type 1 only) 6 Table 6 Construction of 4 mm 2multicore XLPE or HEPR insulated unarmoured cable (Type 1 only) 6 Table 7 Construction of 2.5 mm 2multicore thermosetting insulated armoured cable (Type 2 only) 7 Table 8 Construction of 2.5 mm 2multicore thermosetting insulated unar

9、moured cable (Type 2 only) 7 Table 9 Schedule of tests 8 Table 10 Diameter of armour wire 10 Table 11 Requirements for non-electrical tests for thermosetting insulation 12 Table 12 Requirements for non-electrical tests for non-halogenated bedding and oversheath 14 Table 13 Mass of zinc coating 17 Ta

10、ble 14 Requirements for compatibility of insulation and oversheath 17 Table 15 Special type test for Type 2 cables 18BS 7870-8.5:2003 ii BSI 16 June 2003 Foreword This section of BS 7870 has been prepared by Subcommittee GEL/20/16, under the direction of Technical Committee GEL/20. BS 7870 implement

11、s 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 accordance with the decision of the CENELEC Technical Board. BS 7870 applies to cables for fixe

12、d 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 7870-8.5 implements HD 627:Part 7A1 and is to be read in conjunction with BS 7870-1 and BS 7870-2. It has b

13、een 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. This British Standard calls for procedures that may be injurious to health if adequate precau

14、tions 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 necessary provisions of a contract. Users are responsible for its correct application. Co

15、mpliance 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 23 and a back cover. The BSI copyright notice displayed in this document indicates when the document w

16、as last issued.BS 7870-8.5:2003 BSI 16 June 2003 1 1 Scope This section of BS 7870 specifies requirements for the construction, dimensions and mechanical and physical properties of multicore cables with thermosetting insulation and non-halogenated sheaths, having reduced fire propagation performance

17、, and low emission of smoke when affected by fire. It specifies requirements for: a) steel wire armoured multicore cables (2-core to 48-core) having copper conductors; b) unarmoured multicore cables (2-core to 48-core) having copper conductors. It specifies requirements for both Type 1 and Type 2 ca

18、bles, which are defined as follows: Type 1: cable designed for the installation and operating conditions prevailing in a conventional fossil-fuelled power station or equivalent location; Type 2: cable designed for the installation and operating conditions prevailing in a PWR power station, but exclu

19、ding location in or around the containment area. The requirements specified in this section of BS 7870 are applicable to both Type 1 and Type 2 cables unless otherwise indicated. This section of BS 7870 is applicable to cables for use in and around power stations and other installations having simil

20、ar cable densities. 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 cited applies. For undated references, the latest edition of the referenced document

21、 (including any amendments) applies. BS 6360, Specification for conductors in insulated cables and cords. 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 use by distribution and

22、 generation utilities Part 2: Methods of test. BS 7870-6.3, LV and MV polymeric insulated cables for use by distribution and generation utilities Part 6: Specification for 0.6/1 kV and 1.9/3.3 kV power cables with special fire performance for use in power stations Section 6.3: Cables with thermosett

23、ing insulation and non-halogenated sheath. 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: Procedures 1 kW pre-mixed flame. BS EN 50267-2-1, Common test methods for cables unde

24、r fire conditions Tests on gases evolved during combustion of materials from cables Part 2-1: Procedures Determination of amount of halogen gas. BS EN 50268-2, Common test methods for cables under fire conditions Measurement of smoke density of cables burning under defined conditions Part 2: Procedu

25、re. 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 60811-1-2:1995, Insulating and sheathing materials of electric cabl

26、es Common test methods Part 1-2: General application Thermal ageing methods. BS EN 60811-1-3:1995, 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 60811-1-4:1995,

27、Insulating and sheathing materials for electric cables Common test methods Part 1-4: General application Test at low temperatures. BS EN 60811-2-1:1995, Insulating and sheathing materials for electric cables Common test methods Part 2-1: Methods specific to elastomeric compounds Ozone resistance, ho

28、t set and mineral oil immersion tests.BS 7870-8.5:2003 2 BSI 16 June 2003 BS EN 60811-3-1:1995, Insulating and sheathing materials for electric cables Common test methods Part 3-1: Methods specific to PVC compounds Pressure test at high temperature Tests for resistance to cracking. BS EN ISO 4589-3,

29、 Plastics Determination of burning behaviour by oxygen index Part 3: Elevated temperature test. ASTM D5964-96:2001, Standard practice for rubber IRM 902 and IRM 903 replacement oils for ASTM No. 2 and ASTM No. 3 oils. 3 Voltage designation Cables shall be designated by the voltages U 0 , U and U m ,

30、 expressed in the form U 0 /U (U m ). The voltage designation of cables in this standard is 0.6/1 (1.2) kV. 4 Conductors Conductors shall be 1.5 mm 2 , 2.5 mm 2or 4 mm 2 , of circular stranded copper (class 2), conforming to the requirements of BS 6360. Conformity shall be checked by visual examinat

31、ion as specified in 15.2. NOTE A separator tape may be applied over the conductor. 5 Insulation The insulation for Type 1 cables shall be a single extruded layer of XLPE or HEPR. The insulation for Type 2 cables shall be either a single extruded layer of thermosetting TI Z material, or two bonded la

32、yers of extruded thermosetting material, as a composite layer, conforming to the requirements for TI Z specified in Table 11. The insulation shall be applied so that it fits closely on the conductor and it shall be possible to remove it without damage to the insulation itself or to the conductor. Th

33、e insulation shall be applied by a suitable extrusion process, cross-linked where required, and shall form a compact and homogenous body. Conformity shall be checked by the test methods specified in 15.3. 6 Identification of cores The cores shall be black or white with printed numbers in a contrasti

34、ng colour. The cores shall be numbered in sequence inside to outside from 1 to 48. Cores shall be clearly identifiable and the printing shall be durable. Conformity shall be checked by visual examination as specified in 15.4. 7 Assembly of cores, fillers and binders The direction of lay shall altern

35、ate for each successive layer. Up to seven cores shall be laid up with either a right- or left-hand direction of lay or an alternating right- and left-hand direction of lay. Conformity shall be checked by visual examination as specified in 15.5. NOTE 1 Where necessary, fillers of suitable synthetic

36、material may be used. NOTE 2 At the discretion of the manufacturer, a synthetic binder tape may be applied over the laid-up cores. 8 Bedding layer (optional for unarmoured cables) The bedding for Type 1 cables shall consist of a compound conforming to the requirements for ZB 1 as specified in Table

37、12. The bedding for Type 2 cables shall consist of a compound conforming to the requirements for ZB 2 as specified in Table 12. NOTE 1 A bedding layer is optional for unarmoured cables. NOTE 2 Tapes may be applied over the bedding.BS 7870-8.5:2003 BSI 16 June 2003 3 9 Armouring Armoured cables shall

38、 have a single layer of galvanized steel wires. The wires shall be applied with a direction of lay opposite to that of the outer layer of cores. Joints in the steel wire armour shall be brazed or welded and any surface irregularity shall be removed. Any joint in any wire shall be not less than 1 m f

39、rom the nearest joint in any other armour wire in the complete cable. NOTE Tapes may be applied over the armour wires. 10 Oversheath The oversheath for Type 1 cables shall consist of an extruded layer of compound conforming to the requirements for ZM 1 as specified in Table 12. The oversheath for Ty

40、pe 2 cables shall consist of an extruded layer of black compound conforming to the requirements for ZM 2 as specified in Table 12. 11 Marking 11.1 External marking The external surface of the cable shall be legibly marked with the following elements: 1) The marking shall be by indenting or embossing

41、 on the oversheath. For cables with tabulated 2)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 conflict, on two or more primary lines along the axis of the cable, approximately equally spaced around the

42、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 2)approximate overall diameters of 15 mm or less, the elements shall be arranged as for cables of greater than 15 mm diameter, except that

43、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 mm. The distance between the end of one element of marking and the beginning of the next identical elem

44、ent 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 14.6. 11.2 Identification of year of manufacture A means of identifying the year of manufacture of the cable

45、 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, the distance between the end of one mark and the beginning of the next mark shall be not greater tha

46、n 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 than 1 100 mm. Conformity shall be checked by visual examination and measurement as specified in 14.6. 1)

47、 Marking BS 7870-8.5:2003 on or in relation to a product represents a manufacturers declaration of conformity, i.e. a claim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the claim is solely the claimants responsibility. Such a declaratio

48、n is not to be confused with third-party certification of conformity Element Example of marking a) Electric cable ELECTRIC CABLE b) Voltage designation 600/1 000 V AUX c) British Standard number 1)and cable type BS 7870-8.5 Type 1 or BS 7870-8.5 Type 2 d) Manufacturers identification XYZ 2) See Tabl

49、e 1 to Table 8.BS 7870-8.5:2003 4 BSI 16 June 2003 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 external surface of the cable, as specified by the approval organization. If the mark is on the external surface of the