EN 60811-402-2012 en Electric and optical fibre cables - Test methods for non-metallic materials - Part 402 Miscellaneous tests - Water absorption tests.pdf

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 402: Miscellaneous tests Water absorption testsBS EN 60811-402:2012National forewordThis British Sta

2、ndard is the UK implementation of EN 60811-402:2012. It isidentical to IEC 60811-402:2012. 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Superseded standards are withdrawnThe UK participation in its preparation was entrusted by Technical Comm

3、itteeGEL/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 acontract. Users are responsible for its

4、 correct application. The British Standards Institution 2012Published by BSI Standards Limited 2012ISBN 978 0 580 65312 4ICS 29.035.01; 29.060.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of the StandardsPol

5、icy and Strategy Committee on 31 July 2012.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 60811-402:2012BS EN 60811-100 together with Supersedes - -201, -202, -203, -501 BS EN 60811-1-1:1995 -301, -302, -411, -601, -602, -603, -604 BS EN 60811-5-1:2000 -401, -412

6、 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 60811-1-4:1995 -508, -509 BS EN 60811-3-1

7、:1995EUROPEAN STANDARD EN 60811-402 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 Marnix 17, B - 1000 Brussels 2012 C

8、ENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60811-402:2012 E ICS 29.035.01; 29.060.20 Supersedes EN 60811-1-3:1995 (partially) + A1:2001 (partially)English version Electric and optical fibre cables - Test methods for non-metall

9、ic materials - Part 402: Miscellaneous tests - Water absorption tests (IEC 60811-402:2012) Cbles lectriques et fibres optiques - Mthodes dessai pour les matriaux non-mtalliques - Partie 402: Essais divers - Essais dabsorption deau (CEI 60811-402:2012) Kabel, isolierte Leitungen und Glasfaserkabel -

10、Prfverfahren fr nichtmetallene Werkstoffe - Teil 402: Sonstige Prfungen - Wasseraufnahmeprfungen (IEC 60811-402:2012) This European Standard was approved by CENELEC on 2012-04-16. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving

11、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 CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three off

12、icial 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 CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotec

13、hnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Swi

14、tzerland, Turkey and the United Kingdom. EN 60811-402:2012 - 2 - Foreword The text of document 20/1286/FDIS, future edition 1 of IEC 60811-402, prepared by IEC/TC 20 “Electric cables“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60811-402:2012. The following dates are

15、 fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2013-01-16 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2015-04-16 This document supersed

16、es Clause 9 of EN 60811-1-3:1995 + A1:2001 (partially). Full details of the replacements are shown in Annex A of EN 60811-100:2012. There are no technical changes with respect to EN 60811-1-3:1995 + A1:2001, but see the Foreword to EN 60811-100:2012. This standard is to be read in conjunction with E

17、N 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 responsible for identifying any or all such patent rights. This standard covers the Principle Elements of the Safety Objectives for

18、Electrical Equipment Designed for Use within Certain Voltage Limits (LVD - 2006/95/EC) Endorsement notice The text of the International Standard IEC 60811-402:2012 was approved by CENELEC as a European Standard without any modification. BS EN 60811-402:2012- 3 - EN 60811-402:2012 Annex ZA (normative

19、) Normative references to international publications with their corresponding European publications The following documents, in 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 r

20、eferences, the latest edition of the referenced document (including any amendments) applies. NOTE When an international publication 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 fib

21、re cables - Test methods for non-metallic materials - Part 100: General EN 60811-100 2012 BS EN 60811-402:2012 2 60811-402 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 Pre-conditioning 6 4.3 Electrical wat

22、er absorption test 6 4.3.1 Apparatus 6 4.3.2 Preparation of test pieces 7 4.3.3 Test procedure 7 4.3.4 Evaluation of results 7 4.4 Gravimetric water absorption test 7 4.4.1 Preparation of test piece 7 4.4.2 Testing procedure 8 4.4.3 Expression of results . 9 5 Test report 9 Bibliography 10 Table 1 d

23、.c. test voltages . 7 BS EN 60811-402:201260811-402 IEC:2012 5 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 materia

24、ls. NOTE 1 Non-metallic materials are typically used for insulating, 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 als

25、o been widely accepted and used for other cables, in particular optical fibre cables, communication and control cables and cables for ships and offshore applications. BS EN 60811-402:2012 6 60811-402 IEC:2012 ELECTRIC AND OPTICAL FIBRE CABLES TEST METHODS FOR NON-METALLIC MATERIALS Part 402: Miscell

26、aneous tests Water absorption tests 1 Scope This Part 402 of IEC 60811 describes water absorption tests which typically apply to cross-linked and thermoplastic compounds used for insulating and sheathing materials. 2 Normative references The following documents, in whole or in part, are normatively

27、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. IEC 60811-100:2012, Electric and optical fibre cables Test methods fo

28、r non-metallic materials Part 100: General 3 Terms and definitions 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. Unless otherwise specified, tests shall be c

29、arried out at room temperature. 4.2 Pre-conditioning All the tests shall be carried out not less than 16 h after the extrusion or cross-linking, if any, of the insulating or sheathing compounds. If the test is carried out at room temperature, the test pieces shall be kept for at least 3 h at a tempe

30、rature of (23 5) C. 4.3 Electrical water absorption test 4.3.1 Apparatus The following apparatus shall be used: a) a.c and d.c voltage sources; b) voltmeter; c) water bath with heating equipment. BS EN 60811-402:201260811-402 IEC:2012 7 4.3.2 Preparation of test pieces The cores to be tested shall b

31、e removed from a sample of finished cable approximately 3 m long. Care shall be taken to avoid damage to the insulation during removal of the cores. 4.3.3 Test procedure a) Pre-test The cores shall be immersed in a water bath in which the water has been heated to the temperature specified in the sta

32、ndard for the type of cable. The ends of the cores shall protrude sufficiently above the water level to prevent damage due to leakage current along the surface of the cores when the required voltage is applied between the conductors and the water. After the cores have been immersed in the water for

33、1 h, an a.c. voltage of 4 kV shall be applied between the conductors and the water for 5 min. If any sample of core breaks down, it shall be removed from the water bath and not used in the main test specified in item b) below. However, the test shall be repeated not more than twice, by taking anothe

34、r sample of the same core, which shall be subjected to the same pre-test. The object of the pre-test is to ensure that only undamaged cores are used for the main test. b) Main test Cores which are satisfactory on the pre-test shall remain in the water bath with the water still maintained at the temp

35、erature specified in the relevant standard. A d.c. voltage in accordance with Table 1 below shall be applied between the conductors and the water for the time specified in the standard for the type of cable, the negative pole being connected to the conductor of each test piece. Table 1 DC test volta

36、ges Thickness, t, of insulation specified Mean value mm DC voltage V 0,8 and 0,9 1,0 and 1,2 1,2 t 1,6 1,6 t 2,0 2,0 t 800 1 000 1 400 2 000 2 500 4.3.4 Evaluation of results No breakdown shall occur. 4.4 Gravimetric water absorption test 4.4.1 Preparation of test piece a) For cables with conductors

37、 of nominal cross-sectional area equal to or less than 25 mm2and rated voltage up to and including 0,6/1 kV: Each test piece shall be a piece of core approximately 300 mm in length. b) For all other cables: Slices of 0,6 mm to 0,9 mm thickness shall be ground or cut with surfaces approximately paral

38、lel and free from roughness. BS EN 60811-402:2012 8 60811-402 IEC:2012 Test pieces 80 mm to 100 mm long and 4 mm to 5 mm wide shall be punched out of the slices. c) Two test pieces shall be prepared from each core to be tested. 4.4.2 Testing procedure a) For test pieces as in item a) of 4.4.1: Clean

39、 the surface of the test piece by rubbing with a filter paper moistened with water. Allow the test piece to dry at (70 2) C to constant weight. It may also be allowed to dry by placing it for 24 h in a low-pressure oven at not more than 6,6 mbar and (70 2) C. Cool the sample in a desiccator. Weigh t

40、he test piece to within 0,1 mg. Let M1 be the mass in milligrams. Wind the test piece around a mandrel, whose diameter is between six and eight times that of the test piece, so as to bend it to a U shape and force the ends through apertures bored in the cover of a suitable glass vessel. Only the two

41、 test pieces of the same core should be in the glass vessel. Adjust the position of the test piece such that 250 mm of its length is immersed when the vessel is filled with water up to the edge of the fitted cover. Use preboiled distilled or deionized water. Allow the test piece to remain at the tem

42、perature and for the time specified in the product standard. If the time is not specified, it shall be 14 days for specified thicknesses up to 1,0 mm, 21 days for thicknesses between 1,1 mm and 1,5 mm, and 28 days for thicknesses above 1,5 mm. If the temperature is not specified, it shall be 5 K bel

43、ow the maximum conductor temperature, but not exceeding 90 C. The water level shall be maintained up to the inside surface of the cover. The water is then allowed to cool to ambient temperature. Remove the test piece and shake off any drops of water adhering to it, wipe lightly with a filter paper a

44、nd weigh to the nearest milligram within 2 min to 3 min of its being removed from the water. Let M2 be the new mass in milligrams. Finally, dry out the test piece under the same conditions as were used before immersion, i.e. using whichever of the two alternative methods described above had been use

45、d before the first weighing. Let M3 be the final mass in milligrams. b) For test pieces as in item b) of 4.4.1: The test pieces, with thoroughly cleaned surfaces, shall be heated at (70 2) C under vacuum (residual pressure close to 1 mbar) for 72 h. Materials of substantially different compositions

46、shall not be treated in the same cell or oven at the same time. After this treatment, the test pieces shall be cooled for 1 h in a desiccator and weighed to the nearest 0,1 mg (mass M1). The test pieces shall then be immersed in deionized (or distilled) water at the temperature and for the time spec

47、ified in the standard for the type of cable. If the temperature is not specified, it shall be 5 K below the maximum conductor temperature, but not greater than 90 C. Each test piece shall be completely immersed in a separate glass to be equipped with a condenser, or in a beaker covered with a glass

48、lid. If a condenser is used, its upper part shall be covered with aluminium foil to prevent any contamination. After the time specified in the standard for the type of cable, or after 14 days if the time is not specified in the cable standard, the test pieces shall be transferred into deionized (or

49、distilled) water at room temperature and kept there to cool. Each test piece shall then be removed from the water, shaken to detach any adherent drops, dried with special filter BS EN 60811-402:201260811-402 IEC:2012 9 paper leaving no fibres, and weighed to the nearest 0,1 mg (mass M2). Finally the test piece shall be treated under the same conditions as were used before immersion. Let M3 be the final mass in milligrams. 4.4.3 Expression of results The mass variation in milligrams