BS 7870-3 10-2001 LV and MV polymeric insulated cables for use by distribution and generation utilities - Specification for distribution cables of rated voltage 0 6 1 kV - PVC insu.pdf

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1、BRITISH STANDARD BS 7870-3.10: 2001 Incorporating Amendment No. 1 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 3.10: PVC insulated combined neutral and earth copper wire concentri

2、c cables with copper or aluminium conductors (Implementation of HD 603) ICS 29.060.20 BS 7870-3.10:2001 This British Standard, having been prepared under the direction of the Electrotechnical Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 S

3、eptember 2001 BSI 4 February 2004 The following BSI references relate to work on this British Standard: Committee reference GEL/20/2 Draft for comment 99/244661 DC ISBN 0 580 37573 0 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical

4、Committee GEL/20, Electric cables, to Subcommittee GEL/20/2, Mains cables, 1 kV and above, upon which the following bodies were represented: Association of Consulting Engineers British Approvals Service for Cables British Cables Association British Plastics Federation Electricity Association ERA Tec

5、hnology Ltd. London Underground Ltd. UK Steel Association Amendments issued since publication Amd. No. Date Comments 14404 4 February 2004 See forewordBS 7870-3.10:2001 BSI 4 February 2004 i Contents Page Committees responsible Inside front cover Foreword ii 1S c o p e 1 2 Normative references 1 3 V

6、oltage designation 1 4 Phase conductors 1 5 Insulation 2 6 Assembly of cores 2 7 Bedding for 3-phase cables 2 8 Neutral/earth concentric conductor 2 9O v e r s h e a t h 2 10 Marking 3 11 End sealing 4 12 Dimensions 4 13 Tests 7 14 Routine tests 7 15 Sample tests 8 16 Type tests 9 Bibliography 11 Ta

7、ble 1 Single phase copper conductor with helical concentric copper neutral/earth conductor 4 Table 2 Single phase aluminium conductor with helical concentric copper neutral/earth conductor 5 Table 3 3-phase copper conductors with helical concentric copper neutral/earth conductor 5 Table 4 3-phase al

8、uminium conductors with helical concentric copper neutral/earth conductor 6 Table 5 Schedule of tests 7 Table 6 Insulation resistance 8 Table 7 Requirements for compatibility of insulation and oversheath 9BS 7870-3.10:2001 ii BSI 4 February 2004 Foreword This section of BS 7870 has been prepared by

9、Subcommittee GEL/20/2. Together with BS 7870-3.11 it supersedes BS 7870-3.1:1996, which is withdrawn. The start and finish of text introduced or altered by amendment is indicated in the text by tags !“. Tags indicating changes to text carry the number of the amendment. For example, text altered by a

10、mendment No. 1 is indicated by !“. BS 7870 implements the nationally applicable parts of Harmonization Documents HD 603, 604, 605, 620, 622, 626 and 627 published by the European Committee for Electrotechnical Standardization (CENELEC) in accordance with the decision of the CENELEC Technical Board.

11、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 7870-3.10 specifies a range of PVC insulated combined neutral/earth (CNE)

12、service cables, implements Part 3N of HD 603 S1 A2, and is to be read in conjunction with BS 7870-1 and BS 7870-2. BS 7870-3.11 specifies a similar range of CNE cables which have XLPE insulation. BS 7870-3.10 and BS 7870-3.11 together represent a full technical revision of BS 7870-3.1. BS 7870-3.12

13、specifies a similar range of CNE cables which have XLPE insulation and low emission of smoke and acid gases when affected by fire. A “Guide to use” for these types of cable is under consideration. Amendment No. 1:2004 implements the changes to the identification of cores by colours, in accordance wi

14、th HD 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 tho

15、se with 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. 1:2004 are effective from 1 st April 2004. The origin

16、al version of this standard remains current until 31 st March 2006. 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. This British Stan

17、dard 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 necessary pro

18、visions 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 11 and a back cover. The B

19、SI copyright notice displayed in this document indicates when the document was last issued.BS 7870-3.10:2001 BSI 4 February 2004 1 1 Scope This section of BS 7870 specifies requirements for the construction, dimensions and mechanical and electrical properties of concentric copper wire combined neutr

20、al/earth (CNE) service cables having a rated voltage of 0.6/1(1.2) kV. It specifies requirements for the following types of cable: single phase or 3-phase; stranded copper or solid aluminium conductors; PVC insulation and oversheath. This section of BS 7870 is applicable to cables that are designed

21、for a maximum continuous conductor operating temperature of 70 C and for a maximum short circuit conductor temperature of 160 C. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this section of this British St

22、andard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. For undated references, the latest edition of the publication referred to applies. BS 6360, Specification for conductors in insulated cables and cords. BS 7655-3.1, Specification for insu

23、lating and sheathing materials for cables Part 3: PVC insulating compounds Section 3.1: Harmonized types. BS 7655-4.1, 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 us

24、e by distribution and generation utilities Part 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 EN 50265-2-1, Common test methods for cables under fire conditions Test for resistance to vertical flame propa

25、gation for a single insulated conductor or cable Part 2-1: Procedures 1 kW pre-mixed flame. BS EN 60811-1-2:1995, Insulating and sheathing materials of electric cables Common test methods Part 1-2: General application Thermal ageing methods. 3 Voltage designation Cables shall be designated by the vo

26、ltages 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. The rated voltage of the cable shall be at least equal to the nominal voltage of the system for which it is intended. 4 Phase conductors The phase conductors shall be ei

27、ther stranded (class 2) plain annealed copper or solid (class 1) aluminium conductors in accordance with BS 6360. Conformity shall be checked by visual examination as specified in 15.2. The d.c. resistance shall conform to the values given in Table 1, Table 2, Table 3 and Table 4. NOTE Other sizes a

28、nd constructions may be provided by agreement between the manufacturer and the purchaser. BS 7870-3.10:2001 2 BSI 4 February 2004 5 Insulation The insulation shall be PVC compound type TI 1, conforming to the requirements of BS 7655-3.1. Insulation shall be applied by the extrusion process and shall

29、 form a compact homogeneous body. The thickness of the insulation shall be in accordance with the values specified in Table 1, Table 2, Table 3 and Table 4. Conformity shall be checked by the test methods specified in 15.4. !The cores of all cables shall be identifiable by colours, as follows: a) si

30、ngle core: brown; b) 3-core: brown, black and grey. “ 6 Assembly of cores The cores of 3-phase cables shall be laid up with a right-hand direction of lay and a minimum lay length of 550 mm. NOTE Where necessary, fillers of suitable synthetic material may be used. 7 Bedding for 3-phase cables A PVC o

31、r synthetic tape bedding, having an approximate total thickness of 0.5 mm, shall be applied over the laid-up cores of 3-phase cables. 8 Neutral/earth concentric conductor The neutral/earth conductor shall consist of a single layer of plain annealed copper wires applied with either a right- or left-h

32、and direction of lay or an alternating right- and left-hand direction of lay. The gap between adjacent wires shall not exceed 4 mm. Conformity shall be checked by visual examination as specified in 15.3. The d.c. resistance shall conform to the values given in Table 1, Table 2, Table 3 and Table 4.

33、NOTE 1 Examples of concentric conductor construction are given in Table 1, Table 2, Table 3 and Table 4. NOTE 2 One or more overlapped synthetic binder tapes may be applied immediately over the concentric layer. 9 Oversheath The oversheath shall be an extruded layer of PVC type TM 1, conforming to t

34、he requirements of BS 7655-4.1. 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 conditions under which the cables are to be used. The thickness of the oversheath

35、shall conform to the values specified in Table 1, Table 2, Table 3 and Table 4. Conformity shall be checked by the test methods specified in 15.5. BS 7870-3.10:2001 BSI 4 February 2004 3 10 Marking 10.1 External marking The external surface of the cable shall be legibly marked with the following ele

36、ments: 1) The marking of elements a) to d) shall be by embossing or by indenting 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 pri

37、mary lines along the axis of the cable, approximately equally spaced around the circumference of the cable. Elements d) and e) shall appear, together or separately, in any sequence that is deemed neither to confuse nor to conflict, either on one of the primary lines, or on a secondary line or lines.

38、 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 consist of upright blo

39、ck 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). Conformity shal

40、l be checked by visual examination and measurement as specified in 14.6. 10.2 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 by use of an identification thread or externally by

41、marking on the surface of the cable. If the identification mark 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 element of marki

42、ng 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. Element Example of marking a) Electric cable ELECTRIC CABLE b) Voltage designation 600/1 000 V c) British Standard number 1)B

43、S 7870-3.10 d) Manufacturers identification XYZ e) Number of cores, type and nominal area of phase conductors, e.g. 1) 3 25 AL shall indicate a 3-core cable with 25 mm 2aluminium phase conductors. 2) 1 25 shall indicate a single core cable with a 25 mm 2copper phase conductor. 1) Marking BS 7870-3.1

44、0:2001 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 declaration is not to be conf

45、used with third-party certification of conformity. 2) See Table 1, Table 2, Table 3 and Table 4.BS 7870-3.10:2001 4 BSI 4 February 2004 10.3 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 identif

46、ication 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, and the distance between the end of one element of marki

47、ng 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. 10.4 Additional marking Where additional marking is made, it shall be throughout the length of the cable, and on the external

48、 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 10.1, 10.2 and 10.3. The additional marking, however made, shall be r

49、epeated at intervals not exceeding 1 100 mm. Conformity shall be checked by visual examination and measurement as specified in 14.6. 10.5 End markings The end of each drum length of 3-phase cable at which the sequence of core colours is clockwise shall be marked red. The other end shall be marked green. Conformity shall be checked by visual examination as specified in 14.6. 11 End sealing Before dispatch, the manufacturer shall cap the ends of all