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1、BRITISH STANDARD BS 7878-7: 1997 Materials used in communication cables Part 7: Halogen free flame retardant thermoplastic sheathing compounds ICS 29.040.20; 33.040.50 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:02:45 GMT+00:00 2006, Uncontrolled Copy, (c
2、) BSI BS 7878-7:1997 This British 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 January 1997 BSI 11-1998 The following BSI references relate to the work on this standard: C
3、ommittee reference EPL/46/1 Draft announced in BSI Update September 1996 ISBN 0 580 26369 X Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee EPL/46, Cables, wires and waveguides, RF connectors and accessories for cabling a
4、nd signalling, to Subcommittee EPL/46/1, Communication cables, on which the following bodies were represented: AEA Technology British Approvals Service for Cables British Broadcasting Corporation British Cable Makers Confederation British Telecommunications plc ERA Technology Federation of the Elect
5、ronics Industry London Underground National Supervising Inspectorate (BSI PC) Society of Cable Telecommunication Engineers Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:02:45 GMT+00:00 2006, Uncontrol
6、led Copy, (c) BSI BS 7878-7:1997 BSI 11-1998i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Halogen free flame retardant thermoplastic compounds3 General comments4 List of referencesInside back cover Licensed Copy: London South Bank University, London South Ban
7、k University, Fri Dec 08 12:02:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7878-7:1997 ii BSI 11-1998 National foreword This British Standard has been prepared by Subcommittee EPL/46/1 and is the English language version of HD 624.7 S1:1994 Materials used in communication cables Part 7: Halogen
8、 free flame retardant thermoplastic sheathing compounds published by the European Committee for Electrotechnical Standardization (CENELEC). A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct applicat
9、ion. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-reference Publication referred to Corresponding British Standard HD 505 series BS 6469 series. Insulating and sheathing materials of electric cables Summary of pages This document comprises a fro
10、nt cover, an inside front cover, pages i and ii, the HD title page, pages 2 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Cop
11、y: London South Bank University, London South Bank University, Fri Dec 08 12:02:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI HARMONIZATION DOCUMENT DOCUMENT DHARMONISATION HARMONISIERUNGSDOKUMENT HD 624.7 S1 March 1994 UDC 621.315.3: 621.315.616 Descriptors: Communication cables, sheathing compound
12、s, halogen free, flame retardant English version Materials used in communication cables Part 7: Halogen free flame retardant thermoplastic sheathing compounds Matriaux utiliss dans les cbles de communication Partie 7: Mlanges de gainage thermoplastiques sans halogne et avec propagation retarde de fl
13、amme Werkstoffe fr Kommunikationskabel Teil 7: Halogenfreie flammwidrige thermoplastische Mantelmischungen This Harmonization Document was approved by CENELEC on 1993-09-22. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for implementatio
14、n of this Harmonization Document on a national level. Up-to-date lists and bibliographical references concerning national implementation may be obtained on application to the Central Secretariat or to any CENELEC member. This Harmonization Document exists in three official versions (English, French,
15、 German). CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical St
16、andardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1994 Copyright reserved to CENELEC members Ref. No. HD 624.7 S1:1994 E Licensed Copy: London South Bank University, London South Ban
17、k University, Fri Dec 08 12:02:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7878-7:1997 BSI 11-1998 2 Foreword This Harmonization Document was prepared by CENELEC Technical Committee TC 46X/WG 2, Communication cables. Following a CLC/TC 46X decision during its meeting on 1992-07-08 and with the
18、approval of the 73rd Technical Board, the text was submitted to the Unique Acceptance Procedure (UAP) in December 1992 and was approved by CENELEC as HD 624.7 S1 on 1993-09-22. The following dates were fixed: For products which have complied with the relevant national standard before 1994-09-01, as
19、shown by the manufacturer or by a certification body, this previous standard may continue to apply for production until 1999-09-01. This document forms part of a series of standards on materials used in communication cables which will include the following parts: Part 1: PVC insulation compounds; Pa
20、rt 2: PVC sheathing compounds; Part 3: PE insulation; Table 1: Solid; Table 2: Cellular (including foam-skin). Part 4: PE sheathing; Part 5: Polypropylene insulation; Part 6: Flame retardant insulation compounds; Part 7: Halogen free flame retardant thermoplastic sheathing compounds; Part 8: Filling
21、 compounds for filled cables. The different parts include specific requirements for communication cables; common characteristics are aligned as far as possible on existing Harmonization Documents, if any, and in as far as these may apply to communication cables. latest date of announcement of the HD
22、 at national level(doa) 1994-03-01 latest date of publication of a harmonized national standard(dop) 1994-09-01 latest date of withdrawal of conflicting national standards(dow) 1994-09-01 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:02:45 GMT+00:00 2006, U
23、ncontrolled Copy, (c) BSI BS 7878-7:1997 BSI 11-19983 Halogen free flame retardant thermoplastic sheathing compounds CharacteristicsTest MethodUnitRequirement 1Maximum rated temperature at cable for which the compound can be used C70 2Mechanical characteristics (note 1) 2.1In state of deliveryHD 505
24、.1.1 9.2 Tensile strength median, min.MPa9 Elongation at break median, min.%125 2.2After ageingHD 505.1.2 8.1 Ageing conditions temperatureC100 2 durationh7 24 Tensile strength variation, max.% 30 Elongation at break median, min.%100100a variation, max.% 30 40 for thicknessmm 0,6 0,6 3Heat shockHD 5
25、05.3.1 9.2 Test conditions temperatureC130 2 durationh1 Result to be obtainedno crack 4Behaviour at low temperature 4.1Bending at low temperaturebHD 505.1.4 8.2 Test conditions temperatureC 15 2 Result to be obtainedno crack 4.2Elongation without breakcHD 505.1.4 8.4 Test conditions temperatureC 15
26、2 Elongation, min.%20 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:02:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7878-7:1997 4 BSI 11-1998 Halogen free flame retardant thermoplastic sheathing compounds General comments: In case of specific applicatio
27、n, additional performances (i.e chemical resistance, UV resistance, water absorbtion.) could be needed. Relevant test methods and requirements shall be included in the relevant cable specification. Cable fire performances shall be specified in the relevant cable specification (flame propagation, evo
28、lution of corrosive gases, smoke opacity, toxicity) in accordance with existing Harmonization Documents (i.e. HD 405, HD 602, HD 606,). CharacteristicsTest methodUnitRequirement 5Pressure at high temperatureHD 505.3.1 8.2 Test conditions temperatureC80 2 duration (for all values of cable diameter) h
29、4 Result to be obtained depth of indentation %50 median, max. 6Oxygen Index (note 2)HD 405.3 7CorrosivityHD 602To meet 8Smoke opacity (note 3) 9ToxicityUnder consideration NOTE 1Guidance for the preparation of samples for tensile and elongation tests before and after ageing. If the samples under tes
30、t have ridges on the inside caused by the inner components of the cable (cores or wire braid) then these ridges should be removed by buffing, cutting or skiving. NOTE 2Oxygen index measurement has been found to be a suitable indicator to guide selection and monitoring of materials used in cables whi
31、ch have to meet the fire performance tests specified in the relevant cable specification. NOTE 3For selection of materials used in cables draft method according to IEC xxxd may be considered. a Provisional value b For outer diameters up to including 12,5 mm c For outer diameters exceeding 12,5 mm d
32、presently 89(Secretariat)35 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:02:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7878-7:1997 BSI 11-1998 List of references See national foreword. Licensed Copy: London South Bank University, London South Bank Un
33、iversity, Fri Dec 08 12:02:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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