BS-EN-60811-1-2-1995 IEC-60811-1-2-1985.pdf

BRITISH STANDARD BS EN 60811-1-2:1995 IEC 811-1-2: 1985 Incorporating Amendment No. 1 Common test methods for insulating and sheathing materials of electric and optical cables Part 1-2: General application Thermal ageing methods The European Standard EN 60811-1-2:1995, with the incorporation of amendment A2:2000, has the status of a British Standard ICS 29.060.20 UDC 621.315.6:621.315.2:620.199.94 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 60811-1-2:1995 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 December 1995 © BSI 12 April 2002 The following BSI references relate to the work on this standard: Committee reference GEL/20/3 Announced in BSI News, July 1995 ISBN 0 580 25006 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee GEL/20, Electric cables, to Subcommittee GEL/20/3, Insulation and sheath, upon which the following bodies were represented: Association of Consulting Engineers British Approvals Service for Cables British Cable Makers Confederation British Plastics Federation British Railways Board British Rubber Manufacturers Association Ltd. British Telecommunications plc Department of Trade and Industry (Consumer Safety Unit, CA Division) Electricity Association ERA Technology Ltd. GAMBICA (BEAMA Ltd.) Institution of Incorporated Executive Engineers London Underground Ltd. Ministry of Defence Queen Mary and Westfield College Telecommunications Cables Group of BCMC Warrington Fire Research Centre Amendments issued since publication Amd. No.DateComments 1346212 April 2002See national foreword and correction of title of standard BS EN 60811-1-2:1995 © BSI 12 April 2002 i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Text of EN 60811-1-23 BS EN 60811-1-2:1995 ii© BSI 12 April 2002 National foreword This Section of BS EN 60811 has been prepared by Subcommittee GEL/20/3 and is the English language version of EN 60811-1-2:1995 Common test methods for insulating and sheathing materials of electric and optical cables Part 1: General application Section 2: Thermal ageing methods, including amendment A2:2000, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC 811-1-2:1985, including Corrigendum May 1986 and Amendments 1:1989 and 2:2000, published by the International Electrotechnical Commission (IEC). This standard supersedes BS 6469-1.2:1992, 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 IEC text carry the number of the IEC amendment. For example, text altered by IEC amendment 1 is indicated by ?. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. 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. 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 and ii, the EN title page, pages 2 to 15 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN 60811-1-2 April 1995 + A2 December 2000 UDC 621.315.6:621.315.2:620.199.94 ICS 29.060.20 Supersedes HD 505.1.2 S2:1991 Descriptors: Electric cable, insulated cable, electrical insulation, sheath, ageing treatment, ageing English version Common test methods for insulating and sheathing materials of electric and optical cables Part 1-2: General application Thermal ageing methods (includes amendment A2:2000) (IEC 811-1-2:1985 + corrigendum May 1986 + A1:1989) Méthodes dessais communes pour les matériaux disolation et de gainage des câbles électriques et optiques Part 1-2: Application générale Méthodes de vieillissement thermique (inclut lamendement A2:2000) (CEI 811-1-2:1985 + corrigendum mai 1986 + A1:1989 + A2:2000) Isolier- und Mantelwerkstofe für Kabel und isolierte Leitungen Allgemeine Prüfverfahren Teil 1-2: Allgemeine Anwendung Thermische Alterung (enthält Änderung A2:2000) (IEC 811-1-2:1985 + Corrigendum Mai 1986 + A1:1989 + A2:2000) This European Standard 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 giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. 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 Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels © 1995 Copyright reserved to CENELEC members Ref. No. EN 60811-1-2:1995 + A2:2000 E EN 60811-1-2:1995 © BSI 12 April 20022 Foreword The text of the International Standard IEC 811-1-2:1985, with its corrigendum May 1986 and its amendment 1:1989, prepared by IEC TC 20, Electric cables, was approved by CENELEC as HD 505.1.2 S2 on 1990-12-10. This Harmonization Document was submitted to the formal vote for conversion into a European Standard and was approved by CENELEC as EN 60811-1-2 on 1994-12-06. Where reference is made to HD 505.1.2 S2:1991 in another standard, users should refer to this EN 60811-1-2 for the current information. The following date was fixed: Annexes designated “normative” are part of the body of the standard. In this standard, Annex ZA is normative. Annex ZA has been added by CENELEC. Foreword to amendment A2 The text of document 20/397/FDIS future amendment 2 to IEC 60811-1-2:1985, prepared by IEC TC 20, Electric cables, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as amendment A2 to EN 60811-1-2:1995 on 2000-11-01. The following date was fixed: Contents Page Foreword2 1Scope3 2Test values3 3Applicability3 4Type tests and other tests3 5Pre-conditioning3 6Test temperature3 7Median value3 8Thermal ageing methods3 8.1Ageing in an air oven3 8.2Ageing in an air bomb8 8.3Ageing in an oxygen bomb8 8.4Methods of measuring air flow in ovens9 Appendix A Corresponding clauses and sub-clauses in IEC Publications 538 and 540 and IEC Publication 81113 Annex ZA (normative) Normative references to international publications with their corresponding European publications15 Figure 16 Figure 27 Figure 3 Flowmeter for air-flow control in air ovens for method 211 Figure 4 Calibration diagram of the capillary tube (diameter: d = 2 mm; length: l = 70 mm) of the flowmeter for air-flow control in air ovens for method 2 12 Table 14 latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement(dop) 1996-03-01 latest date by which the amendment has to be implemented at national level by publication of an identical national standard or by endorsement(dop) 2001-08-01 latest date by which the national standards conflicting with the amendment have to be withdrawn(dow) 2003-11-01 EN 60811-1-2:1995 © BSI 12 April 2002 3 1 Scope This standard specifies the test methods to be used for testing polymeric insulating and sheathing materials of electric cables for power distribution and telecommunications including cables used on ships ?and in offshore applications?. This Section 2 of Part 1 gives the thermal ageing methods which apply to the most common types of insulating and sheathing compounds (elastomeric, PVC, PE, PP, etc.). 2 Test values Full test conditions (such as temperatures, durations, etc.) and full test requirements are not specified in this standard; it is intended that they should be specified by the standard dealing with the relevant type of cable. Any test requirements which are given in this standard may be modified by the relevant cable standard to suit the needs of a particular type of cable. 3 Applicability Conditioning values and testing parameters are specified for the most common types of insulating and sheathing compounds and of cables, wires and cords. 4 Type tests and other tests The test methods described in this standard are intended, in the first instance, to be used for type tests. In certain tests, where there are essential differences between the conditions for type tests and those for more frequent tests, such as routine tests, these differences are indicated. 5 Pre-conditioning All the tests shall be carried out not less than 16 h after the extrusion or vulcanization (or cross-linking), if any, of the insulating or sheathing compounds. 6 Test temperature Unless otherwise specified, tests shall be carried out at room temperature. 7 Median value When several test results have been obtained and ordered in an increasing or decreasing succession, the median value is the middle value if the number of available values is odd, and is the mean of the two middle values if the number is even. 8 Thermal ageing methods 8.1 Ageing in an air oven 8.1.1 General An ageing treatment in an air oven may be required by the relevant cable standard: a) for prepared test pieces of insulating or sheathing material only (see 8.1.3.1); b) for prepared test pieces of cores (conductor and insulation) (see 8.1.3.2 and subsequent subclauses if necessary); c) for test pieces of completed cable (see 8.1.4); d) for the loss of mass test (see IEC Publication 811-3-2, Clause 8). The ageing test a) and the loss of mass test d) may be combined and carried out on the same test pieces. 8.1.2 Equipment An oven with natural air flow or air flow by pressure. The air shall enter the oven in such a way that it flows over the surface of the test pieces and leaves near the top of the oven. The oven shall have not less than 8 and not more than 20 complete air changes per hour at the specified ageing temperature. Two methods of measuring the rate of air flow through an oven are given in 8.4. EN 60811-1-2:1995 4© BSI 12 April 2002 ?Unless otherwise specified in the relevant cable specification a rotating fan inside the oven is allowed when testing rubber compounds. For all other compounds a fan shall not be used inside the oven, and in cases of dispute rubber compounds shall also be tested in an oven which is designed to operate without a fan rotating inside it.? 8.1.3 Procedure for prepared test pieces 8.1.3.1 Ageing of prepared test pieces of insulating material without conductor and of sheathing material The ageing shall be carried out in an atmosphere having the composition and pressure of the ambient air. The test pieces, as specified in Clause 9 of IEC Publication 811-1-1 shall be suspended vertically and substantially in the middle of the oven so that each piece is at least 20 mm from any other piece. If any of the test pieces are to be used for the loss of mass test, the test piece shall not occupy more than 0,5 % of the volume of the oven. The test pieces shall be kept in the oven at the temperature and for the time specified for the material in the relevant standard for the type of cable. ?Compounds of obviously different compositions shall not be tested at the same time in the same oven.? As soon as the ageing period is completed, the test pieces shall be removed from the oven and left at ambient temperature, avoiding direct sunlight, for at least 16 h. The tensile test shall then be carried out in accordance with 9.1.6 and 9.1.7 of IEC Publication 811-1-1 for both insulation and sheath. 8.1.3.2 Ageing of prepared test pieces of cores with the original conductor a) ?If, after ageing, the conductor and the separator, if any, can be removed without damaging the insulation, the procedure shall be as follows: samples of core, cut into pieces which are sufficiently long, shall be taken, preferably from positions close to that from which the samples for the tensile tests without ageing are taken in accordance with 9.1.3 of IEC 60811-1-1. They shall then be aged as described in 8.1.3.1, after which the conductor shall be removed and the cross-sectional area of the test pieces shall be determined according to 9.1.4b) of IEC 60811-1-1. The tensile test shall then be carried out in accordance with 9.1.7 of IEC 60811-1-1. b) If it is not possible to remove the conductor or the separator, if any, after the ageing procedure without damaging the insulation, the appropriate preparation and test method shall be applied as given in Table 1. Table 1 Summary of ageing tests for insulated conductors in case of difficulties in preparing test pieces due to conductor insulation or separator adhesion during ageing Class of copper conductor and conductor formTest method Class 1: plain copperSee 8.1.3.4a) or if this method also gives rise to adhesion problems, see 8.1.3.4. Ageing followed by the bending test is considered the acceptance procedure in case of dispute Class 1: metal coated or with a separator around the conductor See 8.1.3.4 Class 2: circular conductors up to and including 16 mm2 and having plain or metal coated wires and with or without separator as appropriate See 8.1.3.4 Class 2: conductors above 16 mm2, circular or shaped, and having plain or metal-coated wires See 8.1.3.5 Classes 5 and 6: conductors up to an including 16 mm2 having plain or metal-coated wires and with or without separator as appropriate See 8.1.3.3b) or if this method also gives rise to adhesion problems, see 8.1.3.4. Ageing followed by the bending test is considered the acceptance procedure in case of dispute Classes 5 and 6: conductors above 16 mm2 having plain or metal-coated wires See 8.1.3.5 NOTEIn the cases of the bending test (8.1.3.4), ageing conditions may be different from those requiring the determination of tensile properties (8.1.3.2 and 8.1.3.3); see the relevant cable standard. EN 60811-1-2:1995 © BSI