BS 4553-3-1998 Specification for 600 1000 V single-phase split concentric electric cables - Cables having thermosetting insulation and low emission of smoke and corrosive gases whe.pdf

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1、BRITISH STANDARD BS 4553-3:1998 Incorporating Amendments Nos. 1 and 2 Specification for 600/1 000 V single-phase split concentric electric cables Part 3: Cables having thermosetting insulation and low emission of smoke and corrosive gases when affected by fire ICS 29.060.20 BS 4553-3:1998 This Briti

2、sh Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 August 1998 BSI 29 April 2005 First published, February 1970 Second edition, January 1988 Third edition, February 1992 The

3、following BSI references relate to the work on this standard: Committee reference GEL/20/2 Draft for comment 97/201035 DC ISBN 0 580 29576 1 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee GEL/20, Electric cables, to Subc

4、ommittee 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 Technology Ltd. London Underground Ltd. UK St

5、eel Association Amendments issued since publication Amd. No. Date Comments 14192 5 February 2004 See foreword 15643 29 April 2005 Certification text in foreword changedBS 4553-3:1998 BSI 29 April 2005 i Contents Page Committees responsible Inside front cover Foreword ii 1S c o p e 1 2 Normative refe

6、rences 1 3 Definitions 2 4V o l t a g e d e s i g n a t i o n 3 5 Phase conductor 3 6I n s u l a t i o n 3 7 Identification of phase core 3 8B e d d i n g 4 9 Concentric layer 4 10 Binders 4 11 Oversheath 5 12 Cable marking 5 13 End sealing 6 14 Schedule of tests 6 15 Test conditions 6 16 Routine te

7、sts 6 17 Sample tests 8 18 Type tests 8 Annex A (informative) Recommendations for the selection and operation of cables 10 Annex B (informative) Recommendations for installation of cables 11 Annex C (informative) Information to be provided with enquiry or order 12 Annex D (normative) Measurement of

8、thickness 12 Annex E (normative) Voltage tests on completed cables 12 Annex F (Spare) 12 Annex G (normative) Compatibility test 13 Annex H (informative) Notes on type tests 13 Annex J (informative) Guide to use 14 Bibliography 17 Table 1 Schedule of tests 7 Table 2 Compatibility requirements 8 Table

9、 3 600/1 000 V XLPE-insulated single-phase split concentric cables with stranded copper phase conductors 9 Table 4 600/1 000 V XLPE-insulated single-phase split concentric cables with solid aluminium phase conductors 9BS 4553-3:1998 ii BSI 29 April 2005 Foreword This British Standard has been prepar

10、ed by Subcommittee GEL/20/2. It is one of three parts of a full technical revision of BS 4553:1992, 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,

11、 text altered by amendment No. 1 is indicated by !“. BS 4553-3 specifies the range of split concentric cables which have thermosetting insulation and non-halogenated sheaths and a low emission of smoke and acid gas when affected by fire. In addition, the standard contains the option of solid alumini

12、um conductors or stranded copper conductors, as well as the option of using a separate extruded bedding to build up the core to a diameter suitable for applying the split concentric layer. BS 4553-1 specifies the range of split concentric cables but which have PVC insulation and sheath. BS 4553-2 sp

13、ecifies a similar range of split concentric cables, but which have thermosetting insulation and sheath. Amendment No. 1:2004 implements the changes to the identification of cores by colours, in accordance with HD 308 S2. The principal identification colours are now: Single phase Green-and-yellow (Ea

14、rth); 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 those with the pre-existing ones is carried out safely. BS 7671, as amended in parallel with thi

15、s standard, gives some guidance in this respect, but does not cover all installation conditions or cables uses. The provisions introduced by amendment No. 1:2004 are effective from 1 stApril 2004. The original version of this standard remains current until 31 stMarch 2006. Product certification/insp

16、ection/testing. Users of this British Standard are advised to consider the desirability of third-party certification/inspection/testing of product conformity with this British Standard. Users seeking assistance in identifying appropriate conformity assessment bodies or schemes may ask BSI to forward

17、 their enquiries to the relevant association. WARNING. This standard calls for the use of substances and/or 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 healt

18、h and safety at any stage. Annex D, Annex E and Annex G are normative. Annex A, Annex B, Annex C, Annex H and Annex J are informative. 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

19、 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 17 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.BS 4553-

20、3:1998 BSI 29 April 2005 1 1 Scope This British Standard specifies requirements for construction and describes methods of test for XLPE-insulated single-phase split concentric cables for operation on an earthed neutral system at nominal voltages up to and including 1 000 V between phases and 600 V t

21、o earth and which, when assessed by the specified tests, produce lower levels of smoke and corrosive products under exposure to fire, compared with corresponding cables conforming to BS 4553-1 and BS 4553-2. In this standard, the level of corrosive (and acid) gases is determined by measurement of hy

22、drochloric acid (HCl) in accordance with !BS EN 50267-2-1 “. The cables specified in this part of BS 4553 have a central phase conductor insulated with XLPE and a concentric layer comprising bare copper wires (earth continuity conductor) and copper wires covered with extruded polymer (neutral conduc

23、tor). The cables are intended for use in fixed installations in industrial areas, buildings and similar applications. They are suitable for use in situations where the combination of ambient temperature and temperature rise due to loading current results in a conductor temperature not exceeding 90 C

24、 and for a maximum short-circuit conductor temperature of 250 C. NOTE 1 Limitation on the temperature of the cables may be imposed in situations where they may be touched. NOTE 2 Due to the relatively high conductor temperature, there is a risk of drying out the surrounding soil causing an increase

25、in thermal resistivity which in turn would lead to the cable temperature rising to a higher value than anticipated. For cable laid directly in the ground, a suitable de-rating factor should be applied or a lower maximum sustained conductor operating temperature should be assumed to take into account

26、 the possible effects of soil drying out. NOTE 3 In installations which include cable joints and terminations, the performance of these accessories should be taken into account in deciding the maximum operating temperature of the cable. Guidance concerning selection, installation and usage is given

27、in Annex A, Annex B and Annex J respectively. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of this British Standard. For dated references, subsequent amendments to, or revisions of, any of these

28、publications do not apply. For undated references, the latest edition of the publication referred to applies. !Text deleted “. BS 4066-3, Tests on electric cables under fire conditions Part 1: Tests on bunched wires or cables. BS 4727-2-08, Glossary of electrotechnical, power, telecommunication, ele

29、ctronics, lighting and colour terms Part 2: Terms particular to power engineering Group 08: Electric cables. BS 5099, Specification for spark testing of electric cables. BS 6360, Specification for conductors in insulated cables and cords. BS 6425-1, Tests on gases evolved during the combustion of ma

30、terials from cables Part 1: Method for determination of amount of halogen acid gas evolved during combustion of polymeric materials taken from cables. BS 7622-2, Measurement of smoke density of electric cables burning under defined conditions Part 2: Test procedure and requirements. BS 7655-1.3, Spe

31、cification for insulating and sheathing materials for cables Part 1: Elastomeric insulating compounds Section 1-3: XLPE PVC sheathing compounds. BS 7655-6.1, Specification for insulating and sheathing materials for cables Part 6: Thermoplastic sheathing compounds having low emission of corrosive gas

32、es, and suitable for use in cables having low emission of smoke when affected by fire Section 6.1: General application thermoplastic 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 cab

33、le Part 2-1: Procedures 1 kW pre-mixed flame. BS EN 50266-2-4, Common test methods for cables under fire conditions Test for vertical flame spread of vertically-mounted bunched wires or cables Part 2-4: Procedures Category C. “BS 4553-3:1998 2 BSI 29 April 2005 !BS EN 50267-2-1, Common test methods

34、for cables under fire conditions Tests on gases evolved during combustion of material from cables Part 2-1 Procedures Determination of the amount of halogen acid gas. BS EN 50268-2, Common test methods for cables under fire conditions Measurement of smoke density of cables burning under defined cond

35、itions Part 2: Procedure. “ BS EN 60811-1-1, Insulating and sheathing materials of electric cables. Common test methods Part 1: General application Section 1-1: Measurement of thickness and overall dimensions. Tests for determining the mechanical properties BS EN 60811-1-2:1995, Insulating and sheat

36、hing materials of electric cables. Common test methods Part 1: General application Section 1-2: Thermal ageing methods. BS EN 60811-1-3, Insulating and sheathing materials of electric cables. Common test methods Part 1: General application Section 1-3: Methods for determining the density. Water abso

37、rption tests. Shrinkage test. 3 Definitions For the purposes of this British Standard the terms and definitions given in BS 4727-2-08 apply, together with the following: 3.1 rated voltage U 0nominal power-frequency voltage between phase conductor and earth, for which the cable is suitable 3.2 rated

38、voltage U nominal power-frequency voltage between phase conductors for which the cable is suitable 3.3 maximum voltage U mmaximum sustained power-frequency voltage between phase conductors for which the cable is suitable 3.4 nominal value value by which a quantity is designated and which is often us

39、ed in tables NOTE In this standard, nominal values usually give rise to values to be checked by measurements taking into account specified tolerances. 3.5 approximate value value which is only indicative NOTE In this standard, values described as approximate do not constitute requirements to be chec

40、ked by measurement. 3.6 type tests (symbol T) tests required to be made before supplying, on a general commercial basis, a type of cable covered by this standard, in order to demonstrate satisfactory performance characteristics to meet the intended application NOTE These tests are of such a nature t

41、hat, after they have been made, they need not be repeated unless changes are made in the cable material, design or type of manufacturing process which might change the performance characteristics. 3.7 sample tests (symbol S) tests made on samples of completed cable, or components taken from a comple

42、ted cable, adequate to verify that the finished product meets the design specifications 3.8 routine tests (symbol R) tests made on all production lengths to demonstrate their integrityBS 4553-3:1998 BSI 29 April 2005 3 3.9 tests after installation tests intended to demonstrate the integrity of the c

43、able and its accessories as installed 4 Voltage designation The cables shall be designated by the rated voltages U 0and U, expressed in the form U 0 /U. The rated voltage recognized for the purposes of this standard is 600/1 000 V. The maximum designated voltage (U m ) for the purposes of this stand

44、ard is 1 200 V. NOTE Guidance on the selection and operation of cables is given in Annex A. 5 Phase conductor The phase conductor shall be either annealed copper or solid aluminium, as given in Table 3 or Table 4, and shall conform to the requirements detailed in Table 1 and to BS 6360. Where the ma

45、nufacturer deems it necessary to use tinned copper conductors, they shall conform to the requirements of BS 6360 for metal coated conductors. The phase conductor shall be either circular or circular compacted stranded copper (class 2), or circular solid aluminium (class 1) as specified in Table 3 or

46、 Table 4. 6 Insulation 6.1 General The insulation shall be cross-linked polyethylene compound GP 8 conforming to BS 7655-1.3. The insulation shall be applied by the extrusion process to form a compact and homogeneous layer. The manufacturer shall, where necessary to meet the compatibility requiremen

47、ts specified in 18.2, apply a protective barrier between the conductor and the insulation and/or over the insulation. 6.2 Thickness of insulation The thickness of insulation, when determined by taking the average of a number of measurements in accordance with Annex D, shall be not less than the valu

48、e given in Table 3 or Table 4, as appropriate, and the smallest of the measured values shall not fall below the value given in Table 3 or Table 4, as appropriate, by more than 10 % + 0.1 mm. Any optional protective barrier shall not be included in this measurement. 6.3 Spark testing of insulation Th

49、e core insulation shall conform to the requirements for spark testing specified in BS 5099 when tested in accordance with the a.c. or d.c. test methods specified in that standard. The voltage levels shall be determined by reference to the value of insulation thickness given in Table 3 or Table 4. 6.4 Corrosive and acid gas emission of insulation and protective barrier When tested in accordance with !BS EN 50267-2-1 “, the le