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1、BRITISH STANDARD BS 7878-6: 1997 Materials used in communication cables Part 6: Halogen free flame retardant insulation compounds ICS 29.040.20; 33.040.50 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:02:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7878
2、-6:1997 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: Committee refe
3、rence EPL/46/1 Draft for comment 94/201709 DC ISBN 0 580 26368 1 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 and signalling, to Subcommit
4、tee 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 Electronics Industry London Unde
5、rground 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 12:02:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7878-6
6、:1997 BSI 11-1998i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Halogen free flame retardant insulation compounds3 General comments5 Annex A (normative) Volume resistivity6 List of referencesInside back cover Licensed Copy: London South Bank University, London
7、 South Bank University, Fri Dec 08 12:02:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7878-6:1997 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 624.6 S1:1995 Materials used in communication cables Part
8、6: Halogen free flame retardant insulation 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 application
9、. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-reference Publication referred toCorresponding British Standard HD 505 seriesBS 6469 series. Insulating and sheathing materials of electric cables Summary of pages This document comprises a front co
10、ver, an inside front cover, pages i and ii, the HD title page, pages 2 to 6, 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 Copy: Lo
11、ndon South Bank University, London South Bank University, Fri Dec 08 12:02:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI HARMONIZATION DOCUMENT DOCUMENT DHARMONISATION HARMONISIERUNGSDOKUMENT HD 624.6 S1 January 1995 ICS 33.040.50 29.040.20 Descriptors: Flame retardant insulation compounds English v
12、ersion Materials used in communication cables Part 6: Halogen free flame retardant insulation compounds Matriaux utiliss dans les cbles de communication Partie 6: Mlanges pour enveloppes isolantes sans halogne et avec propagation retarde de flamme Werkstoffe fr Kommunikationskabel Teil 6: Halogenfre
13、ie flammwidrige Isoliermischungen This Harmonization Document was approved by CENELEC on 1994-12-06. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for implementation of this Harmonization Document on a national level. Up-to-date lists an
14、d 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, German). CENELEC members are the national electrotechnical committees of
15、 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 Standardization Comit Europen de Normalisation Electrotechnique Europisches
16、 Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1995 Copyright reserved to CENELEC members Ref. No. HD 624.6 S1:1995 E Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:02:54 GMT+00:00 2006, Uncontrolled Copy, (c)
17、BSI BS 7878-6:1997 BSI 11-1998 2 Foreword This Harmonization Document was prepared by the Technical Committee CENELEC TC 46X, Communication cables. The text of the draft was submitted to the formal vote and was approved by CENELEC as HD 624.6 S1 on 1994-12-01. The following dates were fixed: For pro
18、ducts which have complied with the relevant national standard before 1995-12-01, as shown by the manufacturer or by a certification body, this previous standard may continue to apply for production until 2000-12-01. This document forms part of a series of standards on materials used in communication
19、 cables which will include the following parts: Part 1: PVC insulation compounds; Part 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; Par
20、t 7: Halogen free flame retardant thermoplastic sheathing compounds; Part 8: Filling 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 f
21、ar as these may apply to communication cables. latest date by which the existence of the HD has to be announced at national level(doa) 1995-06-01 latest date by which the HD has to be implemented at national level by publication of a harmonized national standard or by endorsement (dop) 1995-12-01 la
22、test date by which the national standards conflicting with the HD have to be withdrawn(dow) 1995-12-01 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:02:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7878-6:1997 BSI 11-19983 Halogen free flame retardant in
23、sulation compounds CharacteristicsTest methodUnitGrades Cross linked insulation Thermoplastic insulation 1Maximum rated temperature at cable for which the compound can be used C9070 2Mechanical characteristics 2.1In state of deliveryHD 505.1.1 9.1 Tensile strength median,min.MPa109 Elongation at bre
24、ak median,min.%125125 2.2After ageingHD 505.1.2 8.1 Ageing conditions temperatureC135 2100 2 durationh7 247 24 Tensile strength variation,max.% 30 30 Elongation at break median,min.%100a variation,max.% 30 40 3Heat shockHD 505.3.1 9.1 Not applicable Test conditions temperatureC130 2 durationh1 Resul
25、t to be obtainedno crack 4Behaviour at low temperature Bending at low temperatureHD 505.1.4 8.1 Test conditions temperatureC 15 2 15 2 Result to be obtainedno crackno crack 5ShrinkageHD 505.1.3 10 Test conditions sample lengthmm200200 temperatureC100100 durationh11 Result to be obtained, max%44 Lice
26、nsed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:02:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7878-6:1997 4 BSI 11-1998 Halogen free flame retardant insulation compounds CharacteristicsTest methodUnitGrades Cross linked insulationThermoplastic insulation 6P
27、ressure at high temperatureHD 505.3.1 8.1 Not applicable Test conditions temperatureC80 2 duration (for all values of cable diameter) h4 Result to be obtained depth of indentation median,max.%50 7 Oxygen index (note 1) HD 405.3% 8 Corrosivity HD 602To meetTo meet 9 Smoke opacity (note 2) 10ToxicityU
28、nder consideration 11Volume resistivity, min.Appended.m at maximum rated temperature at cable 108 (provisional value) 108 (provisional value) at 20 C 1010 (provisional value) 1010 (provisional value) Test conditions sample length, minm55 immersion durationh22 12Dielectric constant (note 3)IEC 250Typ
29、ical value (Under consideration) 13Dissipation factor (note 3)IEC 250Typical value (Under consideration) 14Hot set testHD 505.2.1 9 Not applicable Test conditions temperatureC200 3 durationmin15 load N/cm2 20 Result to be obtained elongation, max%175 permanent set, max%25 NOTE 1Oxygen index measurem
30、ent has been found to be a suitable indicator to guide selection and monitoring of materials used in cables which have to meet the fire performance tests specified in the relevant cable specification. NOTE 2For selection of materials used in cables draft method according to IEC xxxb may be considere
31、d. NOTE 3When required the dielectric constant and dissipation factor, shall be measured at 1 MHz, and at other required values. Typical values are under consideration. a Provisional value b presently IEC 89(Sec)35 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08
32、 12:02:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7878-6:1997 BSI 11-19985 General comments: In case of specific application, additional performances (i.e chemical resistance, UV resistance, water absorbtion.) could be needed. Relevant test methods and requirements shall be included in the rel
33、evant cable specification. The insulating materials of this specification are used for single insulated wires and/or insulated conductors in the cable cores which have to meet the requirements specified in the relevant cable specification in accordance with existing Harmonization Documents about fla
34、me propagation, evolution of corrosive gases, smoke opacity and toxicity. Other insulating materials (eg. PE,.) may be used when fire performances are specified on complete cables only. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:02:54 GMT+00:00 2006, Unc
35、ontrolled Copy, (c) BSI BS 7878-6:1997 6 BSI 11-1998 Annex A (normative) Volume resistivity This test shall be made on insulated conductor sample. The sample shall be immersed in water previously heated to the specified temperature, a length of about 0.25 m at each end of the sample being kept above
36、 the water. A D.C. voltage of between 80 V and 500 V shall be then applied between the conductor and the water. The insulation resistance shall be measured 1 min after application of the voltage. The volume resistivity shall be calculated from the measured insulation resistance by the following form
37、ula: Where: r =volume resistivity, in meters R =measured insulation resistance, in l =length of the sample, in meters D =outer diameter of the insulation, in mm d =inner diameter of the insulation, in mm r 2pl R log e D d -= Licensed Copy: London South Bank University, London South Bank University,
38、Fri Dec 08 12:02:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7878-6:1997 BSI 11-1998 List of references See national foreword. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:02:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 389 Chiswick High Road Lon
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