1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationElectric and optical fibre cables Test methods for non-metallic materialsPart 508: Mechanical tests Pressure test at high temperature for insulation and sheathsBS EN 60811-508:20
2、12National forewordThis British Standard is the UK implementation of EN 60811-508:2012. It isidentical to IEC 60811-508:2012. In the UK, the relationship between the supersessions of BS EN 60811 seriescan be summarized as follows.Superseded standards are withdrawnThe UK participation in its preparat
3、ion was entrusted by Technical CommitteeGEL/20, Electric cables, to Subcommittee GEL/20/17, Electric Cables - Lowvoltage.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions of acont
4、ract. Users are responsible for its correct application. The British Standards Institution 2012Published by BSI Standards Limited 2012ISBN 978 0 580 65332 2ICS 29.035.01; 29.060.20 Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published und
5、er the authority of the StandardsPolicy and Strategy Committee on 31 July 2012.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 60811-508:2012BS EN 60811-100 together with Supersedes - -201, -202, -203, -501 BS EN 60811-1-1:1995 -301, -302, -411, -601, -602, -603,
6、-604 BS EN 60811-5-1:2000 -401, -412 BS EN 60811-1-2:1995 -402, -502, -503, -606 BS EN 60811-1-3:1995 -403, -404, -507 BS EN 60811-2-1:1998 -405, -409 BS EN 60811-3-2:1995 -406, -511, -605, -607 BS EN 60811-4-1:2004 -407, -408, -410, -510, -512, -513 BS EN 60811-4-2:2004 -504, -505, -506 BS EN 60811
7、-1-4:1995 -508, -509 BS EN 60811-3-1:1995EUROPEAN STANDARD EN 60811-508 NORME EUROPENNE EUROPISCHE NORM June 2012 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue
8、 Marnix 17, B - 1000 Brussels 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60811-508:2012 E ICS 29.035.01; 29.060.20 Supersedes EN 60811-3-1:1995 (partially) + A1:1996 (partially) + A2:2001 (partially)English version Elect
9、ric and optical fibre cables - Test methods for non-metallic materials - Part 508: Mechanical tests - Pressure test at high temperature for insulation and sheaths (IEC 60811-508:2012) Cbles lectriques et fibres optiques - Mthodes dessai pour les matriaux non-mtalliques - Partie 508: Essais mcaniques
10、 - Essai de pression temprature leve pour enveloppes isolantes et les gaines (CEI 60811-508:2012) Kabel, isolierte Leitungen und Glasfaserkabel - Prfverfahren fr nichtmetallene Werkstoffe - Teil 508: Mechanische Prfungen - Wrmedruckprfungen fr Isolierhllen und Mntel (IEC 60811-508:2012) This Europea
11、n Standard was approved by CENELEC on 2012-04-17. 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 c
12、oncerning such national standards may be obtained on application to the CEN-CENELEC Management Centre 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 CENELE
13、C member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany,
14、Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. EN 60811-508:2012 - 2 - Foreword The text of document 20/1304/FDIS, future edition 1 of I
15、EC 60811-508, prepared by IEC/TC 20 “Electric cables“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60811-508:2012. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard
16、 or by endorsement (dop) 2013-01-17 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2015-04-17 This document supersedes Clause 8 of EN 60811-3-1:1995 + A1:1996 + A2:2001 (partially). Full details of the replacements are shown in Annex A of EN 6081
17、1-100:2012. Significant technical changes with respect to EN 60811-3-1:1995 are as follows: - re-statement of oven characteristics, especially relating to anti-vibration and to temperature control; - enhanced detail as to the preparations and testing of flat cables; - enhanced detail as to thickness
18、 and dimensional measurements. See also the Foreword to EN 60811-100:2012. This standard is to be read in conjunction with EN 60811-100. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsi
19、ble for identifying any or all such patent rights. This standard covers the Principle Elements of the Safety Objectives for Electrical Equipment Designed for Use within Certain Voltage Limits (LVD - 2006/95/EC). Endorsement notice The text of the International Standard IEC 60811-508:2012 was approve
20、d by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 60811-3-1:1985 NOTE Harmonized as EN 60811-3-1:1995 (not modified). IEC 60811-203 NOTE Harmonized as EN 60811-203. IEC 60811-
21、401 NOTE Harmonized as EN 60811-401. IEC 60811-501:2012 NOTE Harmonized as EN 60811-501:2012 (not modified). BS EN 60811-508:2012- 3 - EN 60811-508:2012 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following documents, in
22、whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE When an international publicat
23、ion has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60811-100 2012 Electric and optical fibre cables - Test methods for non-metallic materials - Part 100: General EN 60811-100 2012 IEC 60811-201 - Electric and optical f
24、ibre cables - Test methods for non-metallic materials - Part 201: General tests - Measurement of insulation thickness EN 60811-201 - IEC 60811-202 - Electric and optical fibre cables - Test methods for non-metallic materials - Part 202: General tests - Measurement of thickness of non-metallic sheath
25、 EN 60811-202 - BS EN 60811-508:2012 2 60811-508 IEC:2012 CONTENTS INTRODUCTION . 5 1 Scope . 6 2 Normative references . 6 3 Terms and definitions . 6 4 Test method . 6 4.1 General . 6 4.2 Apparatus 6 4.2.1 Air oven . 6 4.2.2 Indentation device . 7 4.3 Insulation 7 4.3.1 Sample and test piece prepar
26、ation 7 4.3.2 Procedure 7 4.4 Sheath 9 4.4.1 Sample and test piece preparation for sheaths 9 4.4.2 Procedure 10 5 Test report 11 Annex A (normative) Calculation of the compressing force . 15 Annex B (informative) Recommended performance requirement 17 Bibliography 18 Figure 1 Indentation device 12 F
27、igure 2 Measurement of indentation . 12 Figure 3 Measurement of indentation for small test pieces . 13 Figure 4 Flat cable with a flat smaller side . 13 Figure 5 Indentation device for flat cables with a flat smaller side 14 Table A.1 General value for k . 15 BS EN 60811-508:201260811-508 IEC:2012 5
28、 INTRODUCTION The IEC 60811 series specifies the test methods to be used for testing non-metallic materials of all types of cables. These test methods are intended to be referenced in standards for cable construction and for cable materials. NOTE 1 Non-metallic materials are typically used for insul
29、ating, sheathing, bedding, filling or taping within cables. NOTE 2 These test methods are accepted as basic and fundamental and have been developed and used over many years principally for the materials in all energy cables. They have also been widely accepted and used for other cables, in particula
30、r optical fibre cables, communication and control cables and cables for ships and offshore applications. BS EN 60811-508:2012 6 60811-508 IEC:2012 ELECTRIC AND OPTICAL FIBRE CABLES TEST METHODS FOR NON-METALLIC MATERIALS Part 508: Mechanical tests Pressure test at high temperature for insulation and
31、 sheaths 1 Scope This Part 508 of IEC 60811 gives the procedure for a pressure test at high temperature, which typically applies to thermoplastic compounds used for insulating and sheathing materials. NOTE 1 The method is principally intended for thermoplastic materials, but may be used for cross-li
32、nked materials when specifically required by the relevant cable standard. NOTE 2 The test method is not recommended for thicknesses below 0,7 mm. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application
33、. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60811-100:2012, Electric and optical fibre cables Test methods for non-metallic materials Part 100: General IEC 60811-201, Electric an
34、d optical fibre cables Test methods for non-metallic materials Part 201: General tests Measurement of insulation thicknessIEC 60811-202, Electric and optical fibre cables Test methods for non-metallic materials Part 202: General tests Measurement of thickness of non-metallic sheaths3 Terms and defin
35、itions For the purposes of this document, the terms and definitions given in IEC 60811-100 apply. 4 Test method 4.1 General This part of IEC 60811 shall be used in conjunction with IEC 60811-100. This standard gives the method for the pressure test at high temperature which applies to insulation and
36、 sheathing compounds. All the tests shall be carried out not less than 16 h after the extrusion of the insulating or sheathing compounds. 4.2 Apparatus 4.2.1 Air oven The test shall be carried out in an oven. The oven shall use natural air circulation. BS EN 60811-508:201260811-508 IEC:2012 7 NOTE 1
37、 Forced or continuous air circulation is not required. Ovens fitted with air stirring mechanisms are likely to cause vibration. The oven shall not incorporate any equipment likely to cause vibration, nor shall it include exposed heating elements. The temperature of the air shall be maintained contin
38、uously at the value specified in the relevant cable standard. The oven shall be capable of operating to within 2 K of the specified test temperature. NOTE 2 The need for a temperature control to 2 K is crucial. This is especially so if the material under test is a thermoplastic with a sharp melting
39、point (such as some ethylene polymers) as a small temperature rise above that specified can result in a large increase in indentation. In operation, the oven shall be located in a position free from vibration. 4.2.2 Indentation device A device according to Figure 1 shall be used. It shall consist of
40、 a rectangular blade with an edge (0,70 0,01) mm wide which can be pressed against the test piece under the influence of an applied force. 4.3 Insulation 4.3.1 Sample and test piece preparation For each core to be tested, three adjacent pieces shall be taken from a sample having a length of 250 mm t
41、o 500 mm. The length of each piece shall be 50 mm to 100 mm. From each core piece taken, any covering including the semi-conducting layer, if any shall be removed mechanically. According to the type of cable, the test piece may have a circular, flat or sector-shaped cross-section of length (45 5) mm
42、. The cores of twin- and multiple-grouped-core flat cables without sheath shall not be separated individually, except if the individual conductor cross-section is 10 mm2. If so, a test piece taken from the insulation of an individual core shall be tested. The minimum thickness of insulation to be te
43、sted shall be 0,7 mm. NOTE Insulation thickness down to 0,4 mm may be tested under certain circumstances, but it is not recommended. If tests are made with samples having a thickness below 0,7 mm, it should be recorded as such in the test report. 4.3.2 Procedure 4.3.2.1 Fixing of test pieces The fin
44、al test piece shall consist of a piece of the sample from 4.3.1. Circular cores shall be mounted in the position shown in Figure 1 (3a). A flat cable without sheath shall be laid on its flat/major axis side. Sector-shaped cores shall be mounted on a support of an appropriate type as shown in Figure
45、1 (3b and 3c). All test pieces shall be fixed to the support in such a manner that they do not change position during the test. Special care shall be taken with test pieces so that they do not curve under the pressure of the blade. BS EN 60811-508:2012 8 60811-508 IEC:2012 4.3.2.2 Application of for
46、ce A force calculated according to Annex A shall be applied in a direction perpendicular to the axis of the core. The blade shall also be perpendicular to the relevant axis. 4.3.2.3 Protocol in air oven The loaded blade shall be placed onto the fixed test piece at ambient temperature. The whole asse
47、mbly shall then be placed in the air oven which is at the specified test temperature. The apparatus, with loaded test pieces, shall be placed in a position free from vibration (see 4.2.1). The temperature of the air shall be maintained continuously at the value specified in the relevant cable standa
48、rd. In case of dispute, the temperature shall be checked by means of a suitable temperature-measuring device, mounted at the same level as the test piece and as close as possible to one of the test pieces and the temperature shall be continuously monitored during the test. NOTE 1 It is critical to e
49、nsure that the temperature does not, at any time, exceed the upper limit specified for testing the particular material. Temperatures below the lower limit specified may be experienced briefly immediately after starting the test. Such short periods may be ignored. The assembly shall be kept in the test position for the time specified in the relevant cable standard, or, if the time is not specified in the cable standard, for the following times: 4 h for test pie
