BS 7870-8 6-2003 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 7870-8.6:2003 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 8.6: Single wire or double steel tape armoured and non-halogenated sheathed

2、 multipair cable with copper conductors (Implementation of part of HD 627) ICS 29.060.20 BS 7870-8.6:2003 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 Br

3、itish Standard: Committee reference GEL/20/16 Draft for comment 99/244662 DC ISBN 0 580 37572 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 cables, upon w

4、hich 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 7870-8.6:2003 BSI 16 June 2003 i Contents Page

5、Committees responsible Inside front cover Foreword ii 1S c o p e 1 2 Normative references 1 3 Rated voltage 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 4 8 Rip cord 4 9 Collective screen 4 10 Bedding layer 4 11 Armouring 4 12 Oversheat

6、h 4 13 Marking 5 14 Dimensions 6 15 Tests 8 16 Routine tests 9 17 Sample tests 10 18 Type tests 12 Annex A (informative) Guide to use 20 Bibliography 23 Table 1 Colour codes 3 Table 2 Multipair cables (Type 1) 7 Table 3 Multipair cables (Type 2) 7 Table 4 Schedule of tests 8 Table 5 Diameter of armo

7、ur wire 11 Table 6 Type approval tests 12 Table 7 Mass of zinc coating 13 Table 8 Requirements for non-electrical tests on polyethylene 13 Table 9 Requirements for non-electrical tests on aromatic compound 14 Table 10 Requirements for non-electrical tests for non-halogenated bedding and oversheath 1

8、5 Table 11 Special type tests for Type 2 cables 18BS 7870-8.6:2003 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 implements the nationally applicable parts of Harmonization Documents HD 603

9、, 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 fixed installations having a rated voltage U 0 /U up to and including 1

10、9/33 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 7870-8.6 implements HD 627:Part 7A2 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 ex

11、ecution 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 precautions are not taken. It refers only to technical suitability and doe

12、s 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. Compliance with a British Standard does not of itself confer immunity

13、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 was last issued.BS 7870-8.6:2003 BSI 16 June 2003 1 1 Scope This sect

14、ion of BS 7870 specifies requirements for the construction, dimensions and mechanical and physical properties of multipair cables with halogen-free insulation and sheaths, having reduced fire propagation performance and low emission of smoke when affected by fire. It specifies requirements for multi

15、pair cables (up to 200-pair) with copper conductors, a collective screen and armouring consisting of a single layer of steel wires or a double layer of steel tapes. It specifies requirements for both Type 1 and Type 2 cables, which are defined as follows: Type 1: cable designed for the installation

16、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 excluding location in or around the containment area. The requirements specified in t

17、his 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 similar cable densities. NOTE A “guide to use” is given in Annex A. 2 Normative refer

18、ences 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 (including any amendments) applies. BS 6360, Specification for conductors in in

19、sulated 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 generation utilities Part 2: Methods of test. BS EN 50265-2-1:1999, Common test

20、 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 50265-2-2:1999, Common test methods for cables under fire conditions Test for resistance to vertical flame propagatio

21、n for a single insulated conductor or cable Part 2-2: Procedures Diffusion flame. BS EN 50267-2-1, Common test methods for cables under fire conditions Tests on gases evolved during combustion of materials from cables Part 2-1: Procedures Determination of amount of halogen gas. BS EN 50268-2:2000, C

22、ommon test methods for cables under fire conditions Measurement of smoke density of cables burning under defined conditions Part 2: Procedure. 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 ov

23、erall dimensions Tests for determining the mechanical properties. BS EN 60811-1-2:1995, Insulating and sheathing materials of electric 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 t

24、est methods Part 1-3: General application Methods for determining the density Water absorption tests Shrinkage test. BS EN 60811-1-4:1995, 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, Insulati

25、ng 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 7870-8.6:2003 2 BSI 16 June 2003 BS EN 60811-3-1:1995, Insulating and sheathing materials for electric cables Common tes

26、t methods Part 3-1: Methods specific to PVC compounds Pressure test at high temperature Tests for resistance to cracking. BS EN 60811-4-1:1995, Insulating and sheathing materials for electric cables. Common test methods Part 4-1: Methods specific to polythene and polypropylene compounds Resistance t

27、o environmental stress cracking Wrapping test after thermal ageing in air Measurement of flow index Carbon black and/or mineral content measurement in PE. BS EN 60811-4-2:2000, Insulating and sheathing materials of electric cables Common test methods Methods specific to polyethylene and polypropylen

28、e 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 EN ISO 4589-3, Plastics Determination of burning behaviour by oxygen

29、index Part 3: Elevated temperature test. IEC 60189-1:1986, Low-frequency cables and wires with PVC insulation and PVC sheath Part 1: General test and measuring methods. IEC 60189-2:1986, Low-frequency cables and wires with PVC insulation and PVC sheath Part 2: Cables in pairs, triples, quads and qui

30、ntuples for inside installation. 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 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 or

31、 tinned copper wire consisting of a single strand of 0.8 mm nominal diameter, conforming to the requirements of BS 6360. Conformity shall be checked by visual examination as specified in 17.2. 5 Insulation The insulation for Type 1 cables shall be an extruded layer of PE compound conforming to the r

32、equirements given in Table 8. The insulation for Type 2 cables shall be an extruded layer of an aromatic based compound conforming to the requirements of this specification and meeting the requirements of BS EN 50265-2-2 in the core stage. The insulation shall be applied so that it fits closely on t

33、he 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 checked by the test methods

34、specified in 17.3. 6 Identification of cores 6.1 Cores With the exception of 2-pair cables, the insulation of cores shall be colour coded in accordance with the code given in IEC 60189-2 and in Table 1 using cabling elements 1 to 20 inclusive, in sequence. The cores of 2-pair cables shall be laid up

35、 as a quad in the sequence white, red, blue, orange.BS 7870-8.6:2003 BSI 16 June 2003 3 Table 1 Colour codes Conformity shall be checked by visual examination as specified in 17.5.1. 6.2 Pairs, quads and units The cores of 2-pair cables shall be colour coded as detailed in 6.1 and shall be laid up i

36、n quad formation and bound overall with non-hygroscopic tape binder as detailed below. 5-pair and 10-pair cables shall consist of cabling elements colour coded 1 to 5 and 1 to 10 respectively as detailed in Table 1, and shall be laid up to form a compact and symmetrical cable. The laid-up group shal

37、l be bound overall with a non-hygroscopic tape binder as detailed below. Non-hygroscopic fillers shall be used if necessary for 2-pair, 5-pair and 10-pair constructions in order to form a compact and symmetrical cable. 20-pair to 200-pair cables shall be constructed from the required number of cabli

38、ng units. Each cabling unit shall consist of 20 cabling elements, colour coded 1 to 20 as detailed above, laid up in concentric layers to form a compact and symmetrical unit. The cabling unit shall be bound overall with non-hygroscopic tape binder of minimum thickness 0.023 mm and shall be applied w

39、ith a minimum overlap of 25 %. The required number of cabling units, individually identified as detailed below, shall be laid up in concentric layers to form a compact and symmetrical cable and shall be bound overall with a double layer of clear non-hygroscopic tape, the layers being applied in oppo

40、site directions. Open spiral inter-layer tapes shall be applied if necessary. The cable construction shall consist of the required number of cabling units, using non-hygroscopic fillers where necessary, to form a compact and symmetrical cable. The cabling units in cables having 40 pairs or more shal

41、l be individually identified by printed numbers of a contrasting colour to the natural base. The printed numbers shall be applied direct on to the tape forming the unit binder or on a separate longitudinal tape applied under a clear unit binder tape. The numbers shall run from one upwards in units o

42、f one. The height of the figures shall be not less than 2 mm and shall be spaced such that ready identification of all units is possible in any 50 mm of cable. The figures shall be applied with an ink that is capable of withstanding the effect of wiping with a dry or wet cloth, and that will remain

43、identifiable after the removal of the cable bedding and collective screen. Conformity shall be checked by visual examination as specified in 17.5.2. Cabling element Colour of insulation Wire a Wire b 1 White Blue 2W h i t eO r a n g e 3 White Green 4W h i t eB r o w n 5W h i t eG r e y 6R e dB l u e

44、 7R e dO r a n g e 8 Red Green 9R e dB r o w n 10 Red Grey 11 Black Blue 12 Black Orange 13 Black Green 14 Black Brown 15 Black Grey 16 Yellow Blue 17 Yellow Orange 18 Yellow Green 19 Yellow Brown 20 Yellow GreyBS 7870-8.6:2003 4 BSI 16 June 2003 7 Assembly of cores, fillers and binders Cable shall

45、be twinned and where required formed into separate identifiable units, which shall then be laid up to form a compact and symmetrical cable using non-hygroscopic fillers and binders as required. Conformity shall be checked by visual examination as specified in 17.6. 8 Rip cord A terylene rip cord sha

46、ll be included to facilitate stripping. 9 Collective screen 2-pair cables with binding tape shall have a plain aluminium tape of minimum thickness 0.075 mm applied helically with a minimum 25 % overlap, in contact with which shall be a 1/0.8 mm tinned copper drain wire or stranded conductor of equiv

47、alent cross-sectional area. 5-pair and above cables shall have a collective aluminium screen with a backing which will ensure adhesion to the bedding. The laminated screen tape shall be applied longitudinally over the rip cord and drain wire, and shall be in electrical contact with the latter, which

48、 shall be a 1/0.8 mm diameter tinned copper wire. The laminated screen shall be a minimum thickness of 0.15 mm aluminium bonded to a suitable backing material. Conformity shall be checked by measurement as specified in 17.8. 10 Bedding layer The bedding layer shall be an extruded layer of compound t

49、ype ZM 1 for Type 1 cables and type ZM 2 for Type 2 cables. 11 Armouring Cables shall be armoured either with a single layer of galvanized steel wires, applied with a direction of lay opposite to that of the pairs, or (in the case of Type 1 cables, 20-pair to 200-pair) with a double layer of galvanized steel tape each 0.5 mm thick. The tapes shall be ap