BS EN 60811-406-2012 Electric and optical fibre cables Test methods for non-metallic materials Miscellaneous tests Resistance to stress cracking of polyethylene and polypropylene c.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 406: Miscellaneous tests Resistance to stress cracking of polyethylene and polypropylene compoundsBS

2、 EN 60811-406:2012National forewordThis British Standard is the UK implementation of EN 60811-406:2012. It isidentical to IEC 60811-406:2012. In the UK, the relationship between the supersessions of BS EN 60811 seriescan be summarized as follows.Superseded standards are withdrawnThe UK participation

3、 in its preparation 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 pro

4、visions of acontract. Users are responsible for its correct application. The British Standards Institution 2012Published by BSI Standards Limited 2012ISBN 978 0 580 65316 2ICS 29.035.01; 29.060.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard wa

5、s published under the authority of the StandardsPolicy and Strategy Committee on 31 July 2012.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 60811-406:2012BS EN 60811-100 together with Supersedes - -201, -202, -203, -501 BS EN 60811-1-1:1995 -301, -302, -411, -60

6、1, -602, -603, -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, -

7、506 BS EN 60811-1-4:1995 -508, -509 BS EN 60811-3-1:1995EUROPEAN STANDARD EN 60811-406 NORME EUROPENNE EUROPISCHE NORM June 2012 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management

8、 Centre: Avenue 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 60811-406:2012 E ICS 29.035.01; 29.060.20 Supersedes EN 60811-4-1:2004 (partially)English version Electric and optical fibre cables

9、- Test methods for non-metallic materials - Part 406: Miscellaneous tests - Resistance to stress cracking of polyethylene and polypropylene compounds (IEC 60811-406:2012) Cbles lectriques et fibres optiques - Mthodes dessai pour les matriaux non-mtalliques - Partie 406: Essais divers - Rsistance des

10、 mlanges polythylne et polypropylne aux craquelures (CEI 60811-406:2012) Kabel, isolierte Leitungen und Glasfaserkabel - Prfverfahren fr nichtmetallene Werkstoffe - Teil 406: Sonstige Prfungen - Prfung der Spannungsrissbestndigkeit von Polyethylen- und Polypropylenmischungen (IEC 60811-406:2012) Thi

11、s 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 this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical ref

12、erences 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 official versions (English, French, German). A version in any other language made by translation under the responsibility of

13、 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 electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France,

14、Germany, 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 60811-406:2012 - 2 - Foreword The text of document 20/1290/FDIS, future editi

15、on 1 of IEC 60811-406, prepared by IEC/TC 20 “Electric cables“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60811-406:2012. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national

16、 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 supersedes Clause 8 of EN 60811-4-1:2004 (partially). Full details of the replacements are shown in Annex A of EN 60811-100:2012.

17、 There are no technical changes with respect to EN 60811-4-1:2004, but see 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 an

18、d/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 Electrical Equipment Designed for Use within Certain Voltage Limits (LVD - 2006/95/EC) Endorsement notice The text of the International Stand

19、ard IEC 60811-406:2012 was approved by CENELEC as a European Standard without any modification. BS EN 60811-406:2012- 3 - EN 60811-406:2012 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following documents, in whole or in p

20、art, 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 publication has been

21、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 BS EN 60811-406:2012 2 60811-406 IEC:2012 CONTENTS

22、INTRODUCTION . 5 1 Scope . 6 2 Normative references . 6 3 Terms and definitions . 6 4 Test method . 6 4.1 General . 6 4.2 Method A . 7 4.2.1 Reagent. 7 4.2.2 Apparatus 7 4.2.3 Test pieces preparation . 8 4.2.4 Test procedure 8 4.2.5 Evaluation of results 8 4.3 Method B . 9 4.3.1 Reagent. 9 4.3.2 App

23、aratus 9 4.3.3 Test pieces preparation . 9 4.3.4 Test procedure 9 4.3.5 Evaluation of results 9 5 Test report 9 Annex A (normative) Test sheet preparation 13 Annex B (informative) Tools and reagents 15 Bibliography 16 Figure 1 Notching device . 10 Figure 2 Blade . 10 Figure 3 Bend clamp assembly 11

24、Figure 4 Transfer tool assembly . 11 Figure 5 Brass channel test piece holder . 11 Figure 6 Test tube with inserted brassw channel test piece holder as in 4.2.2 h), containing ten test pieces . 12 Figure 7 Notched test pieces . 12 Table 1 Summary of test conditions and requirements . 7 Table 2 Notch

25、ed test pieces size according to polyethylene density . 8 BS EN 60811-406:201260811-406 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 cabl

26、e construction and for cable materials. 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

27、 in all energy cables. They have also 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 60811-406:2012 6 60811-406 IEC:2012 ELECTRIC AND OPTICAL FIBRE CABLES TEST METHODS FOR NON-

28、METALLIC MATERIALS Part 406: Miscellaneous tests Resistance to stress cracking of polyethylene and polypropylene compounds 1 Scope This Part 406 of IEC 60811 gives the procedure for evaluating the resistance to stress cracking of polyethylene and polypropylene compounds which are typically used for

29、communication and optical fibre cables. 2 Normative references 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 references, the latest edition of the

30、referenced document (including any amendments) applies. IEC 60811-100:2012, Electric and optical fibre cables Test methods for 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

31、 General This part of IEC 60811 shall be used in conjunction with IEC 60811-100. Unless otherwise specified, tests shall be carried out at room temperature. Two test procedures can be applied to materials, depending on cable system conditions and environments; a summary of test conditions is given i

32、n Table 1: for less severe conditions: Method A; for more severe conditions: Method B. These test procedures apply only to the original granules used as sheathing materials. BS EN 60811-406:201260811-406 IEC:2012 7 Table 1 Summary of test conditions and requirements Conditions and/or requirements Me

33、thod A Method B Preparation of the test sheets: Temperature C Force kN Time min 165 to 170 50 to 200 2 Conditioning of test sheets: Temperature range C Cooling rate K/h See a5 2 Test conditions: Reagent b Concentration % 100 10 Temperature C 50,0 0,5 Duration (minimum) h 24 48 Requirements: Failure

34、rate Max. 5 test pieces (F 50) 0 test pieces (F 0) a Starting temperature varies according to polymer type: - (145 2) C for low-density polyethylene; - (155 2) C for medium-density polyethylene; - (165 2) C for high-density polyethylene. Final temperature (29 1) C. b Igepal CO-630 or any other reage

35、nt having the same chemical composition. 4.2 Method A 4.2.1 Reagent The reagent is a solution of 100 % Igepal CO-630 (Antarox CO-630) or any other reagent having the same chemical composition (see Notes 1 and 2 below and Annex B). NOTE 1 The reagent should not be used more than once. NOTE 2 In the c

36、ase of unexpectedly short failure times, the reagent should be checked for water content as small increases in water content beyond the specified maximum of 1 % will cause a significant increase in reagent activity. 4.2.2 Apparatus The apparatus shall comprise the following elements: a) Clean, sharp

37、, undamaged blanking die with blanking press suitable for cutting test pieces (38,0 2,5) mm (13,0 0,8) mm or other suitable devices. b) Dial gauge, with plane gauging faces 4 mm to 8 mm in diameter and a gauging pressure of 5 N/cm2to 8 N/cm2. c) Notching devices as in Figure 1 with blades as in Figu

38、re 2. NOTE The blade is made of “Gem” blades as in Figure 2 see also Annex A. d) Bending clamp assembly as in Figure 3 with a vice or other suitable device ensuring the symmetrical closing of the clamping jaws. e) Transfer tool assembly as in Figure 4 for shifting in one operation the bent test piec

39、e(s) from the bending clamp to the brass channel. f) Brass channel test piece holder as in Figure 5 for accommodating ten bent test pieces. BS EN 60811-406:2012 8 60811-406 IEC:2012 g) Hard glass test tubes (L = 200 mm, 32 mm) for accommodating the brass channel test piece holder with the bent test

40、pieces. The tubes are plugged by suitable aluminium foil wrapped corks (see Figure 6). h) A heated container of sufficient size and depth to accept racks which will hold the filled test tubes (see Figure 6). The temperature shall be maintained at (50 0,5) C by means of suitable equipment and the the

41、rmal capacity shall be high enough to ensure that the temperature does not drop below 49 C even when the test tubes are inserted. 4.2.3 Test pieces preparation Using the blanking die and blanking press as in 4.2.2 a) or other suitable devices, ten test pieces according to Table 2 and Figure 7 shall

42、be cut from the test sheet more than 25 mm from the edges of the sheet, prepared according to Annex A, so that the web between the holes after removal of the test pieces is not damaged during handling. The thickness of the test pieces determined using the dial gauge as in 4.2.2 b) shall be in accord

43、ance with Table 2 and Figure 7. The test pieces shall be cut with square edges. Bevelled edges may lead to erroneous results. Table 2 Notched test pieces size according to polyethylene density Density of PE-sheathing compounds a A mm B mm C mm D b mm 0,940 g/cm30,940 g/cm338,0 2,5 38,0 2,5 13,0 0,8

44、13,0 0,8 3,00 to 3,30 1,75 to 2,0 0,50 to 0,65 0,30 to 0,40 a The density is for the unfilled resin, according to Clause 5 of IEC 60811-100:2012. b The depth D shall be uniform along its length. 4.2.4 Test procedure Shortly before placing into the reagent, each of the test pieces shall be given a no

45、tch (see Figure 7) using the notching device as in 4.2.2 c). The blade shall be neither dull nor damaged and, therefore, shall be replaced as required. Even under favourable conditions, it should not be used for more than 100 notches. Ten test pieces shall then be placed, with the notch up, in the b

46、ending clamp as in 4.2.2 d) The clamp shall be closed for 30 s to 35 s by means of a vice or a motor-driven arbor press at a constant speed. The bent test pieces shall be lifted with the transfer tool as in 4.2.2 e) from the bending clamp and placed in the brass channel as in 4.2.2 f). If some test

47、pieces are riding too high in the holder, they shall be forced down by manual pressure. The holder shall be inserted in a tube as in 4.2.2 g), 5 min to 10 min after the test pieces have been bent. The test tube shall be filled with the appropriate reagent as in 4.2.1 until all the test pieces are co

48、vered by the liquid, and shall be closed by a cork. The filled test tube shall be placed immediately in a rack in the heated container as in 4.2.2 h) during 24 h. Care shall be taken so that the test pieces do not touch the test tube during the test. The moment of insertion in the heated container s

49、hall be noted. 4.2.5 Evaluation of results In general, stress cracking starts at the notch and runs at right angles to it. The first sign of a crack when examined with normal or corrected vision without magnification, constitutes a failure of the test piece. BS EN 60811-406:201260811-406 IEC:2012 9 After 24 h, in the heated container no more than five test pieces shall have failed. If six test pieces hav