BS 7870-8 3-2003 LV and MV polymeric insulated cables for use by distribution and generation utilities - Specification for multicore and multipair cables for installation above and.pdf

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1、BRITISH STANDARD BS 7870-8.3:2003 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 8.3: Single wire armoured and PVC sheathed multicore cable with copper cond

2、uctors, having reduced fire propagation performance (Implementation of part of HD 627) ICS 29.060.20 BS 7870-8.3:2003 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 wor

3、k on this British Standard: Committee reference GEL/20/16 Draft for comment 99/244662 DC ISBN 0 580 37569 2 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 ca

4、bles, upon which the 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 7870-8.3:2003 BSI 16 June 2003 i Co

5、ntents Page Committees responsible Inside front cover Foreword ii 1S c o p e 1 2 Normative references 1 3 Voltage designation 1 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 2 9A r m o u r i n g 2 10 Oversheath 2 11 Marki

6、ng 3 12 Dimensions 4 13 Tests 6 14 Routine tests 6 15 Sample tests 7 16 Type tests 9 Annex A (informative) Guide to use 13 Bibliography 15 Table 1 Construction of 1.5 mm 2multicore PVC insulated armoured cable 4 Table 2 Construction of 2.5 mm 2multicore PVC insulated armoured cable 4 Table 3 Constru

7、ction of 4 mm 2multicore PVC insulated armoured cable 5 Table 4 Construction of 1.5 mm 2multicore XLPE or HEPR insulated armoured cable 5 Table 5 Construction of 2.5 mm 2multicore XLPE or HEPR insulated armoured cable 5 Table 6 Construction of 4 mm 2multicore XLPE or HEPR insulated armoured cable 6

8、Table 7 Schedule of tests 7 Table 8 Diameter of armour wire 8 Table 9 Requirements for non-electrical tests for 90 C insulation 10 Table 10 Mass of zinc coating 11 Table 11 Requirements for compatibility of insulation and oversheath 12BS 7870-8.3:2003 ii BSI 16 June 2003 Foreword This section of BS

9、7870 has been prepared 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 Standa

10、rdization (CENELEC) in 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

11、7870-1. BS 7870-8.3 implements HD 627:Part 5A1 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

12、 been produced. WARNING. This 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 no

13、t 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 itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and

14、 ii, pages 1 to 15 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.BS 7870-8.3:2003 BSI 16 June 2003 1 1 Scope This section of BS 7870 specifies requirements for the construction, dimensions and mechanical and electrical properties of

15、 multicore XLPE, HEPR and PVC insulated and PVC sheathed cables having reduced fire propagation performance conforming to BS EN 50265-2-1 and BS EN ISO 4589-3. It specifies requirements for steel wire armoured multicore cables (2-core to 48-core) having copper conductors. This section of BS 7870 is

16、applicable to cables for use in and around power stations and other installations having similar 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 th

17、e edition cited 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 7870-1, LV and MV polymeric insulated cables for use by distribution and generation utilities Par

18、t 1: General. BS 7870-2:1999, LV and MV polymeric insulated cables for use by distribution and generation utilities Part 2: Methods of test. BS 7870-6.2:1999, 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

19、 cables with special fire performance for use in power stations Section 6.2: XLPE or HEPR insulated and PVC sheathed cables. BS 7655-3.1, Specification for insulating and sheathing materials for cables Part 3: PVC insulating compounds Section 3.1: Harmonized types. BS 7655-4.1, Specification for ins

20、ulating and sheathing materials for cables Part 4: PVC sheathing compounds Section 4.1: Harmonized types. 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-mi

21、xed flame. 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 electr

22、ic cables 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 60811-2-1

23、:1995, Insulating and sheathing materials for electric cables Common test methods Part 2-1: Methods specific to elastomeric compounds Ozone resistance, hot set and mineral oil immersion tests. BS EN ISO 4589-3, Plastics Determination of burning behaviour by oxygen index Part 3: Elevated temperature

24、test. 3 Voltage designation Cables shall be designated by the voltages U 0 , U and U m , expressed in the form U 0 /U (U m ). The voltage designation of cables in this standard is 0.6/1(1.2) kV.BS 7870-8.3:2003 2 BSI 16 June 2003 4 Conductors Conductors shall be 1.5 mm 2 , 2.5 mm 2or 4 mm 2circular

25、stranded copper (class 2), conforming to the requirements of BS 6360. Conformity shall be checked by visual examination as specified in 15.2. NOTE A separator tape may be applied over the conductor. 5 Insulation The insulation shall be XLPE, HEPR or PVC compound. The insulation shall be applied so t

26、hat it fits closely on the conductor and it shall be possible to remove it without damage to the insulation itself or to the conductor. The insulation shall be applied by a suitable extrusion process, cross-linked where required, and shall form a compact and homogenous body. Conformity shall be chec

27、ked by the test methods specified in 15.3. 6 Identification of cores The cores shall be black or white with printed numbers in a contrasting 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. Conformi

28、ty shall be checked by visual examination as specified in 15.4. 7 Assembly of cores, fillers and binders The direction of lay shall alternate 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 direct

29、ion of lay. Conformity shall be checked by visual examination as specified in 15.5. NOTE 1 Where necessary, fillers of suitable synthetic 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 The bedding sha

30、ll be an extruded layer of polymer compound, conforming to the requirements specified in Table 1 to Table 6. NOTE Tapes may be applied over the bedding. 9 Armouring All cables shall be armoured with a single layer of galvanized wires. The wires shall be applied with a direction of lay opposite to th

31、at of the outer layer of cores. Joints in the steel wire amour shall be brazed or welded and any surface irregularity shall be removed. Any joint in any wire shall be not less than 1 m from the nearest joint in any other armour wire in the complete cable. NOTE Tapes may be applied over the armour wi

32、res. 10 Oversheath The oversheath shall be an extruded layer of PVC compound type TM 1, conforming to the requirements of BS 7655-4.1.BS 7870-8.3:2003 BSI 16 June 2003 3 11 Marking 11.1 External marking The external surface of the cable shall be legibly marked with the following elements: 1)The mark

33、ing shall be by indenting or embossing 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, ap

34、proximately equally spaced around the circumference of the cable. Elements d) and e) shall appear upon at least one line, which may be one of the primary lines or a secondary line. NOTE Elements d) and e) may appear in any sequence that is deemed neither to confuse nor to conflict and need not all b

35、e on the same 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 the marking for elements a), b) and c) shall appear on one or more primary lines. The letters and figures shall con

36、sist 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 elements a), b) and c) and not greater than 1 100 mm for elements d) and e

37、). 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 shall be provided throughout the length of the cable, either internally or by use of an identification thr

38、ead 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 than 550 mm. If the identification is by marking on the external surface, the distance between the end of one

39、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. 11.3 Mark of an approval organization If the mark of an approval organization is used, it shall be provided t

40、hroughout 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 cable, it shall be in the form of the symbol(s) specified by the approval organization, a

41、nd 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) Marking BS 7870-8.3:2003 on or in relation to a product represents

42、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 declaration is not to be confused with third-party certification of conformity

43、. Element Example of marking a) Electric cable ELECTRIC CABLE b) Voltage designation 600/1 000 V AUX c) British Standard number 1) BS 7870-8.3 d) Manufacturers identification XYZ e) Number and size of cores e.g. 19 2.5 2) See Table 1 to Table 6.BS 7870-8.3:2003 4 BSI 16 June 2003 11.4 Additional mar

44、king Where additional marking is made, it shall be throughout the length of the cable, and on the external 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 rend

45、er illegible the marking specified in 11.1, 11.2 and 11.3. The additional marking, however made, shall be repeated at intervals not exceeding 1 100 mm. Conformity shall be checked by visual examination and measurement as specified in 14.6. 12 Dimensions The dimensions of the component layers shall b

46、e as specified in Table 1 to Table 6. Table 1 Construction of 1.5 mm 2multicore PVC insulated armoured cable Table 2 Construction of 2.5 mm 2multicore PVC insulated armoured cable Cable type Conductor size Mean thickness of insulation Mean thickness of bedding Approximate diameter over bedding Armou

47、r wire diameter Mean thickness of oversheath Approximate overall diameter mm 2 mm mm mm mm mm mm 2-core 1.5 0.6 0.8 7.6 0.9 1.4 12.3 3-core 1.5 0.6 0.8 8.1 0.9 1.4 12.8 4-core 1.5 0.6 0.8 8.8 0.9 1.4 13.5 7-core 1.5 0.6 0.8 10.6 0.9 1.4 15.2 12-core 1.5 0.6 0.8 13.8 1.25 1.5 19.4 19-core 1.5 0.6 0.8

48、 16.3 1.25 1.6 22.2 27-core 1.5 0.6 1.0 19.9 1.6 1.7 26.7 37-core 1.5 0.6 1.0 22.4 1.6 1.8 29.2 48-core 1.5 0.6 1.0 25.7 1.6 1.9 32.9 Cable type Conductor size Mean thickness of insulation Mean thickness of bedding Approximate diameter over bedding Armour wire diameter Mean thickness of oversheath A

49、pproximate overall diameter mm 2 mm mm mm mm mm mm 2-core 2.5 0.7 0.8 8.9 0.9 1.4 13.6 3-core 2.5 0.7 0.8 9.4 0.9 1.4 14.1 4-core 2.5 0.7 0.8 10.3 0.9 1.4 15.0 7-core 2.5 0.7 0.8 12.4 1.25 1.5 18.0 12-core 2.5 0.7 0.8 16.5 1.25 1.6 22.4 19-core 2.5 0.7 1.0 19.8 1.6 1.7 26.6 27-core 2.5 0.7 1.0 23.9 1.6 1.8 30.7 37-core 2.5 0.7 1.0 26.8 1.6 1.9 34.0 48-core 2.5 0.7 1.2 31.3 2.0 2.1 39.5