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1、BRITISH STANDARD BS 8436:2004 Incorporating Amendment No. 1 Electric cables 300/500 V screened electric cables having low emission of smoke and corrosive gases when affected by fire, for use in walls, partitions and building voids Multicore cables ICS 13.220.99; 29.060.20 ? Licensed Copy: London Sou
2、th Bank University, London South Bank University, Fri Dec 08 01:13:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8436:2004 This British Standard, was published under the authority of the Standards Policy and Strategy Committee on 12 August 2004 BSI 29 April 2005 The following BSI references relat
3、e to the work on this British Standard: Committee reference GEL/20/17 Draft for comment 02/204741 DC ISBN 0 580 44157 1 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee GEL/20, Electric cables, to Subcommittees GEL/20/17,
4、Low voltage cables, upon which the following bodies were represented: BEAMA Installation Ltd. British Approvals Service for Cables British Cables Association British Plastics Federation Chartered Institution of Building Services Department of Trade and Industry Consumer Safety Unit Electricity Assoc
5、iation Energy Industries Council Engineering Industries Association ERA Technology Ltd. Ministry of Defence UK Defence Standardization Amendments issued since publication Amd. No.DateComments 1565929 April 2005Certification text in foreword changed Licensed Copy: London South Bank University, London
6、 South Bank University, Fri Dec 08 01:13:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8436:2004 BSI 29 April 2005 i Contents Page Committees responsibleInside front cover Forewordii 1Scope 1 2Normative references 1 3Terms and definitions 1 4Voltage designation 2 5Conductors 2 6Insulation 2 7Iden
7、tification 3 8Laying-up 3 9Screen 3 10Sheath 4 11Cable marking 4 12Routine tests for finished cables 4 13Sample tests for finished cables 5 14Type tests for finished cables 5 Annex A (informative) Recommendations for selection, operation and installation of cables 6 Annex B (informative) Schedule of
8、 tests 8 Annex C (normative) Measurement of insulation and sheath thickness 9 Annex D (normative) Test conditions 9 Annex E (normative) Method of test for insulation faults 9 Annex F (normative) Method of test for voltage withstand 10 Annex G (normative) Method of test for bending characteristics 10
9、 Annex H (normative) Method of test for resistance to impact at ambient temperature 11 Annex I (normative) Method of test for nail penetration 13 Bibliography 15 Figure H.1 Apparatus for test for resistance to impact 12 Table 1 Dimensions of cables 3 Table 2 Identification of cores 3 Table B.1 Sched
10、ule of tests 8 Table I.1 Minimum test current for nail penetration test 13 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 01:13:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8436:2004 ii BSI 29 April 2005 Foreword This British Standard has been prepared by S
11、ubcommittee GEL/20/17. The cables specified in this British Standard are primarily intended for use in walls, partitions and building voids where there is a high risk that they could be penetrated by nails and similar sharp objects. The cables contain an earthed metallic covering which is in contact
12、 with a full size uninsulated circuit protective conductor. This provides screening and a verifiable earth fault path for the fault current when penetrated by nails etc., and, when connected to a suitably selected protective device, offers electrical protection by disconnection of the circuit, not o
13、ffered by cables of conventional construction. The cables are also designed to produce low levels of smoke and corrosive gases when affected by fire. For the purposes of this British Standard, corrosive (and acid) gases are deemed to be those which are determined as hydrochloric acid (HCl). Cables c
14、overed by this British Standard have limited evolution of smoke and corrosive gases when assessed under the fire conditions specified in BS EN 50268 and BS EN 50267-2-1. In this British Standard, the level of corrosive (and acid) gases is determined by measurement of hydrochloric acid (HCl) in accor
15、dance with BS EN 50267-2-1. The cables specified in this British Standard are suitable for operation at a maximum sustained conductor temperature of 70 C. WARNING. This British Standard calls for the use of procedures that can be injurious to health if adequate precautions are not taken. It refers o
16、nly to technical suitability and does not absolve the user from legal obligations relating to health and safety at any stage. Product certification/inspection/testing. Users of this British Standard are advised to consider the desirability of third-party certification/inspection/testing of product c
17、onformity with this British Standard. Users seeking assistance in identifying appropriate conformity assessment bodies or schemes may ask BSI to forward their enquiries to the relevant association. This publication does not purport to include all the necessary provisions of a contract. Users are res
18、ponsible 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 to ii, pages 1 to 15 and a back cover. The BSI copyright notice displayed in this
19、 document indicates when the document was last issued. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 01:13:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8436:2004 BSI 29 April 2005 1 1 Scope This British Standard specifies requirements for construction and
20、performance, and gives methods of test, for electric cables having thermosetting insulation of rated voltage 300/500 V and low emission of smoke and corrosive gases when affected by fire. It is applicable to 2-core, 3-core and 4-core cables with uninsulated circuit protective conductor and metallic
21、screening, intended for use in walls, partitions and building voids. NOTE A guide to the use of the cables specified in this British Standard is given in Annex A. A summary of the tests applicable to the cables is given in Annex B. 2 Normative references The following referenced documents are indisp
22、ensable 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 4727-2:Group 08, Glossary of electrotechnical, power, telecommunication, electronics, light
23、ing and colour terms Part 2: Terms particular to power engineering Group 08: Electric cables. BS 5099, Electric cables Voltage levels for spark testing. BS 6360, Specification for conductors in insulated cables and cords. BS 7655-1.3, Specification for insulating and sheathing materials for cables P
24、art 1: Elastomeric insulating compounds Section 1.3: XLPE. BS 7655-6.1, Specification for insulating and sheathing materials for cables Part 6: Thermoplastic sheathing compounds having low emission of corrosive gases, and suitable for use in cables having low emission of smoke when affected by fire
25、Section 6.1: General application thermoplastic. BS EN 50265-2-1, Common test methods for cables under fire conditions Part 2-1: Test for resistance to vertical flame propagation for a single insulated conductor or cable Procedures 1 kW pre-mixed flame. BS EN 50267-2-1, Common test methods for cables
26、 under fire conditions Part 2-1: Test on gases evolved during combustion of materials from cables Procedures Determination of the amount of halogen acid gas. BS EN 50268-1, Common test methods for cables under fire conditions Measurement of smoke density of cables burning under defined conditions Pa
27、rt 1: Apparatus. BS EN 50268-2, Common test methods for cables under fire conditions Measurement of smoke density of cables burning under defined conditions Part 2: Procedure. BS EN 50356, Method for spark testing of cables. BS EN 60811-1-1, Insulating and sheathing materials of electric cables Comm
28、on test methods Part 1-1: General application Measurement of thickness and overall dimensions Tests for determining the mechanical properties. 3 Terms and definitions For the purposes of this British Standard the definitions given in BS 4727-2: Group 08 apply, together with the following. 3.1 let-th
29、rough energy I2t energy let-through value of a device, measured in amperes squared seconds (A2s) 3.2 values 3.2.1 approximate value value which is only indicative NOTE Values described as “approximate” do not constitute requirements to be checked by measurement. Licensed Copy: London South Bank Univ
30、ersity, London South Bank University, Fri Dec 08 01:13:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8436:2004 2 BSI 29 April 2005 3.2.2 nominal value value by which a quantity is designated NOTE Nominal values usually give rise to values to be checked by measurements taking into account specifie
31、d tolerances. 3.3 voltages 3.3.1 maximum voltage Um maximum sustained power-frequency voltage between phase conductors for which the cable is suitable 3.3.2 rated voltage U nominal power-frequency voltage between phase conductors for which the cable is suitable 3.3.3 rated voltage Uo nominal power-f
32、requency voltage between conductor(s) and earth for which the cable is suitable 4 Voltage designation The cables shall be designated by the rated voltages Uo and U, expressed in the form Uo/U. NOTE The rated voltage recognized for the purpose of this British Standard is 300/500 V. 5 Conductors The c
33、onductors shall conform to BS 6360, class 1, 2 or 5. The insulated conductors shall be plain or tinned annealed copper. The uninsulated circuit protective conductors shall be tinned annealed copper and shall be of the same nominal cross-sectional area as the insulated conductors. The class of conduc
34、tor shall be the same for all conductors in any single cable. 6 Insulation 6.1 Type The insulation shall be type GP 8 as specified in BS 7655-1.3. 6.2 Application The insulation shall be applied closely to the conductor by the extrusion process and cross-linked to form a compact and homogeneous laye
35、r. When the application is tested by removing the insulation from the conductor, there shall be no damage to the insulation itself, the conductor, or the tin coating, if any. 6.3 Thickness The thickness of the insulation, when determined by taking the average of a number of measurements in accordanc
36、e with Annex C, shall be not less than the value given in Table 1, and the smallest of the measured values shall not fall below the value given in Table 1 by more than 0.1 mm + 10 %. 6.4 Spark test When tested in accordance with BS EN 50356, using the test voltages specified in BS 5099, there shall
37、be no breakdown of the insulation. 6.5 Corrosive and acid gas emission from insulation during combustion When tested in accordance with BS EN 50267-2-1, the level of HCl shall be not greater than 0.5 %. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 01:13:28 GM
38、T+00:00 2006, Uncontrolled Copy, (c) BSI BS 8436:2004 BSI 29 April 2005 3 Table 1 Dimensions of cables 7 Identification The cores of all cables shall be identified by colours, in accordance with Table 2, which shall be either throughout the insulation or on its external surface. The colour used for
39、core identification shall be clearly identifiable. When the core is lightly rubbed ten times with a piece of cotton wool soaked in water, there shall be no degradation of the colour. Table 2 Identification of cores 8 Laying-up 8.1 General The cores of 2-core, 3-core and 4-core cables shall be laid u
40、p using the sequence of colours specified in Clause 7, together with an uninsulated circuit protective conductor. If tape(s) are applied over the insulated laid-up cores, an uninsulated circuit protective conductor shall be applied over the tape(s). 8.2 Corrosive and acid gas emission from tapes dur
41、ing combustion When tested in accordance with BS EN 50267-2-1, the level of HC1 of any binder tape(s) shall be not greater than 0.5 %. 9 Screen One or more metallic or laminated metallic tape(s) shall be applied with the metallic element in contact with the uninsulated circuit protective conductor.
42、NOTE The tapes may be applied either longitudinally or helically or a combination of both. If a tape is applied longitudinally it shall have an overlap of not less than 1 mm, or if applied helically shall have an overlap of not less than 25 %. The thickness of the metallic element of a laminated tap
43、e shall be not less than 0.008 mm. The thickness of the metallic tape (non-laminated) shall be not less than 0.075 mm. The tapes shall be selected and applied in such a way that the completed cable conforms to the requirements specified in this British Standard. Number of cores Nominal cross-section
44、al area of conductor Radial thickness of insulation Radial thickness of sheath Approximate overall diameter mm2mmmmmm 21.00.60.9 8.0 1.50.70.9 8.5 2.50.71.010.5 31.00.60.9 8.0 1.50.70.9 9.5 2.50.71.011.5 41.00.61.0 9.0 1.50.71.010.5 2.50.71.112.0 Number of coresCore colours Up to 31st March 2006aFro
45、m 31st March 2004a 2-core + uninsulated circuit protective conductor Red, black or Red, redBrown, blue or Brown, brown 3-core + uninsulated circuit protective conductor Red, yellow, blueBrown, black, grey 4-core + uninsulated circuit protective conductor Red, yellow, blue, black Blue, brown, black,
46、grey a In accordance with BS 7671:2001, Amendment No 2, installations are permitted with the colours in either of these two columns during the period 31st March 2004 to 31st March 2006. From 31st March 2006 only the colours in the end column will be permitted. Licensed Copy: London South Bank Univer
47、sity, London South Bank University, Fri Dec 08 01:13:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8436:2004 4 BSI 29 April 2005 10 Sheath 10.1 Type The sheath shall be LTS 3 compound conforming to BS 7655-6.1. 10.2 Application The sheath shall be applied by the extrusion process. When the applic
48、ation is tested by removing the sheath from the cable, there shall be no damage to the insulation of the cores. 10.3 Thickness The thickness of the sheath, when determined by taking the average of a number of measurements in accordance with Annex C, shall be not less than the value given in Table 1
49、and the smallest of the measured values shall not fall below the value given in Table 1 by an amount more than 0.1 mm + 15 %. 10.4 Spark test When tested in accordance with BS EN 50356, using the test voltages specified in BS 5099, there shall be no breakdown of the sheath. 10.5 Corrosive and acid gas emission from sheath during combustion When tested in accordance with BS EN 50267-2-1, the level of HC1 shall be not greater than 0.5 %. 11 Cable