1、BRITISH STANDARDCommunication cables Part 2-24: Common design rules and construction PE sheathingICS 29.035.20; 33.120.01NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN50290-2-24:2002+A1:2008Incorporating corrigendum January 2011This British Standard was published under t
2、he authority of the Standards Policy and Strategy Committee on 15 April 2002National forewordAmendments issued since publicationBS EN 50290-2-24:2002+A1:2008 This British Standard is the UK implementation ofEN 50290-2-24:2002+A1:2008. It supersedes BS EN 50290-2-24:2002 whichis withdrawn.The start a
3、nd finish of text introduced or altered by amendment is indicated in the text by tags. Tags indicating changes to CENELEC text carry the number of the CENELEC amendment. For example, text altered by CENELEC amendment A1 is indicated by .The UK participation in its preparation was entrusted by Techni
4、cal Committee EPL/46, Cables, wires and waveguides, RF connectors and accessories for communication and signalling, to Subcommittee EPL/46/1, Communication cables.A list of organizations represented on this s committe can be obtained on request to its secretary.This publication does not purport to i
5、nclude all necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations. BSI 2011 ISBN 978 0 580 74255 2Date Comments Implementation of CENELEC amendment A1:2008“!ub ethe /corrigenda30 April 200
6、931 January 2011 Correction to identifier on EN title pageEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORMCENELECEuropean Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische NormungCentral Secretariat: rue de Stassa
7、rt 35, B - 1050 Brussels 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50290-2-24:2002 EICS 29.035.20; 33.120.10 Supersedes HD 624.4 S1:1996English versionCommunication cables Part 2-24: Common design rules and construction
8、 PE sheathingCbles de communication Partie 2-24: Rgles de conception communes et construction Polythylne pour gainageKommunikationskabel Teil 2-24: Gemeinsame Regeln fr Entwicklung und Konstruktion PE-MantelmischungenThis European Standard was approved by CENELEC on 2001-11-01. CENELEC members are b
9、ound 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
10、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
11、 status as the official versions.CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EN 50
12、290-2-24:2002+AOctober 20081ForewordThis European Standard was prepared by a joint working group of the Technical Committees CENELECTC 46X, Communication cables, and CENELEC TC 86A, Optical fibres and optical fibre cables.The text of the draft was submitted to the Unique Acceptance Procedure and was
13、 approved by CENELECas EN 50290-2-24 on 2001-11-01.This European Standard supersedes HD 624.4 S1:1996.The following dates were fixed: latest date by which the EN has to be implementedat national level by publication of an identicalnational standard or by endorsement (dop) 2002-08-01 latest date by w
14、hich the national standards conflictingwith the EN have to be withdrawn (dow) 2004-08-01Annexes designated “normative“ are part of the body of the standard.In this standard, annexes A, B and C are normative.This European Standard has been prepared under the European Mandate M/212 given to CENELEC by
15、 theEuropean Commission and the European Free Trade Association._This amendment was prepared by a Joint Working Group of the Technical Committees CENELEC TC 46X, Communication cables, and CENELEC TC 86A, Optical fibres and optical fibre cables. The text of the draft was submitted to the Unique Accep
16、tance Procedure and was approved by CENELEC as amendment A1 to EN 50290-2-24:2002 on 2008-11-01. The purpose of this amendment is to align EN 50290-2-24:2002 with new grades available. The following dates were fixed: latest date by which the amendment has to be implementedat national level by public
17、ation of an identical standard or by endorsement (dop) 2009-11-01 latest date by which the national standards conflicting with the amendment have to be withdrawn (dow) 2011-11-01 _ Foreword to amendment A1 BS EN 50290-2-24:2002+A1:2008 - 2 -EN 50290-2-24:2002+A1:2008- 3 -1 ScopeThis Part 2-24 of EN
18、50290 gives specific requirements for PE sheathing compounds used incommunication cables.It is to be read in conjunction with Part 2-20 of EN 50290.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications.These normative references a
19、re cited at the appropriate places in the text and the publications are listedhereafter. For dated references, subsequent amendments to or revisions of any of these publications applyto this European Standard only when incorporated in it by amendment or revision. For undated referencesthe latest edi
20、tion of the publication referred to applies (including amendments).EN 60811-1-1:1995 Insulating and sheathing materials of electric and optical cables - Commontest methods - Part 1-1: General application - Measurement of thickness andoverall dimensions - Tests for determining the mechanical properti
21、es(IEC 60811-1-1:1993)EN 60811-1-2:1995 Insulating and sheathing materials of electric cables - Common test methodsPart 1-2: General application - Thermal ageing methods(IEC 60811-1-2:1985 + corr. May 1986 + A1:1989)EN 60811-1-3:1995 Insulating and sheathing materials of electric and optical cables
22、- Commontest methods - Part 1-3: General application - Methods for determining thedensity - Water absorption tests - Shrinkage test (IEC 60811-1-3:1993)EN 60811-1-4:1995 Insulating and sheathing materials of electric and optical cables - Commontest methods - Part 1-4: General application - Tests at
23、low temperature(IEC 60811-1-4:1985 + corr. May 1986 + A1:1993)EN 60811-4-1:1995 Insulating and sheathing materials of electric cables - Common test methods- - Part 4: Methods specific to polyethylene and polypropylene compounds - -Section 1: Resistance to environmental stress cracking - Wrapping tes
24、t afterthermal ageing in air - Measurement of the melt flow index - Carbon blackand/or mineral content measurement in PE (IEC 60811-4-1:1985)EN 60811-4-2:1999 Insulating and sheathing materials of electric and optical fibre cables -Common test methods - - Part 4: Methods specific to polyethylene and
25、polypropylene compounds Section 2: Tensile strength and elongation at breakafter pre-conditioning - Wrapping test after thermal ageing in air -Measurement of mass increase Long - term stability test - Test method forcopper - catalysed oxidative degradation(IEC 60811-4-2:1990, mod.)3 RequirementsIn c
26、ase of specific applications, additional performances could be needed. Relevant test methods andrequirements shall be included in the detail specifications of the cables.BS EN 50290-2-24:2002+A1:2008EN 50290-2-24:2002+A1:2008- 4 -Table 1 Black PE sheathing compound Characteristics Test method Unit G
27、rades a(see Note 1) LD MD HD LLD 1 Maximum rated temperature at cable for which the compound can be used C 70 80 80 80 2 Density a(without carbon black) EN 60811-1-3,Clause 8 g/cm 0,940 1 000 h 1 000 h 1 000 h 1 000 hNOTE 1 In order to differentiate LD from LLD-Polyethylene the melting point accordi
28、ng to ISO 11357-3 ecan be measured. The melting point of LD is 0,940 1 000 h 1 000 h 1 000 h 1 000 hNOTE 1 In order to differentiate LD from LLD-Polyethylene the melting point according to ISO 11357-3 dcan be measured. The melting point of LD is 12 + g163 12 + g163 6+g163 3+1 03 12 + g163 12 + g163
29、6+g163 3+1 03,5 g62 12 + g163 12 + g163 6+g163 3+ 1 04 g62 12 + g163 12 + g163 6+g163 3+ 1 04,5 g62 12 + g163 12 + g163 6+g163 3+1 05 g62 12 + g163 12 + g163 6+g163 3+1 05,5 12 + g163 12 + g163 6+g163 3+1 06 g62 12 + g163 12 + g163 6+g163 3+1 06,5 g62 12 + g163 12 + g163 6+g163 3+1 07 g62 12 + g163
30、12 + g163 6+g163 3+1 0NOTE 7 g109m corresponds to 0,7 spc mm under a magnification of 100; similarly 60 g109m corresponds to 6 spc mm under a magnification of 100.BS EN 50290-2-24:2002+A1:2008EN 50290-2-24:2002+A1:2008- 14 -Table B.2 (normative) - Photomicrographs for rating the appearance of disper
31、sionsBS EN 50290-2-24:2002+A1:2008EN 50290-2-24:2002+A1:2008- 15 - BS EN 50290-2-24:2002+A1:2008EN 50290-2-24:2002+A1:2008- 16 -Table B.3 (informative) - Examples of grading of agglomeratesTable B.3.1 - Example 1Dimension samples(g109m)5to10112021303140415051606170Grading for the sampleSample 1 3 2
32、1 Grade 2,0Sample 2 3 5 1 Grade 2,5Sample 3 14 2 1 Grade 3,0Sample 4 3 2 2 Grade 2,5Sample 5 3 2 4 Grade 3,0Sample 6 3 12 5 7 Grade 3,5Incidence of agglomerates by sizeTable B.3.1 shows the number of agglomerates, classed by size, in each sample.Gradings:(2,0 + 2,5 + 3,0 + 2,5 + 3,0 + 3,5) / 6 = 2,7
33、5Hence the mean grade = 2,8BS EN 50290-2-24:2002+A1:2008EN 50290-2-24:2002+A1:2008- 17 -Table B.3 (informative) - Examples of grading of agglomerates (Contd)Table B.3.2 - Example 2Dimension samples(g109m)5to1011202130314041505160Grading of the sampleSample 1 7 3 9 3 1 Grade 3,0Sample 2 7 3 9 3 Grade
34、 3,0Sample 3 7 3 5 3 Grade 2,5Sample 4 19 5 1 Grade 2,5Sample 5 19 5 2 Grade 3,0Sample 6 1 Grade 3,0Incidence of agglomerates by sizeTable B.3.2 shows the number of agglomerates, classed by size, in each sample.Gradings:(3,0 + 3,0 + 2,5 + 2,5 + 3,0 + 3,0) / 6 = 2,8333Hence the mean grading = 2,9BS E
35、N 50290-2-24:2002+A1:2008EN 50290-2-24:2002+A1:2008- 18 -Annex C(normative)Resistance to environmental stress cracking on cable sheathC.1 PurposeThe purpose of this annex is to describe methods to evaluate the resistance to stress cracking of thepolyethylene cable jackets.C.2 Method A - Test on comp
36、lete cableC.2.1 GeneralThis test method is applicable for all sizes of cable.A test specimen comprising a length of cable is submitted both to a constant deformation and to a surface-active liquid heated at 50 C.C.2.2 ApparatusC.2.2.1 Metallic half-circular bends whose diameter is 12 times the cable
37、 diameter.C.2.2.2 A climatic circulating air oven whose dimensions are sufficient to accept bends with test specimensto be tested. The temperature shall be regulated (70 1) C.C.2.2.3 Surface-active liquid whose volume is sufficient and regulated (50 1) C.The surface-active liquid used is an aqueous
38、solution containing 1 % of polyethanol-nonyl-phenol (IgepalCO-630 or Antarox CO-630 or equivalent).This reagent is bio-degradable, the bath shall be regenerated after a maximum 10 days of use.C.2.3 SpecimenTest specimens shall constitute cable lengths whose dimensions comply with the relevant bend d
39、iameter.These specimens shall form a semi-circle and shall be secured on the mandrel with metallic clamps orpolyamide bonds, located at the end of the bend.A minimum length of one metre, for each cable, consisting of one or several specimens, shall be tested.C.2.4 ProcedureC.2.4.1 The bent cable on
40、the mandrel is placed in the climatic oven for 4 hours; at a temperature of(70 2) C.C.2.4.2 The cable and the mandrel are then removed from the oven and kept at ambient temperature for aminimum duration of 4 hours.C.2.4.3 The specimen is removed from the mandrel, straightened and then bent in the re
41、verse direction onthe same mandrel.C.2.4.4 The specimen and the mandrel are then immersed in the bath of surface-actve liquid, heated to(50 2) C for 72 hours.BS EN 50290-2-24:2002+A1:2008EN 50290-2-24:2002+A1:2008- 19 -C.2.5 Evaluation of resultsExamination for presence of cracks, with normal or cor
42、rected vision without magnification.C.2.6 Test reportThe test report shall mention- the type of cable;- the cable diameter;- the diameter of the bend used;- the number of specimens tested and their length;- any other observations;- the result obtained.C.3 method B - Test on pieces of sheathC.3.1 Gen
43、eralThis method can be used for cable diameter greater than 10 mm and sheath thickness greater than 1,6 mm.C.3.2 ApparatusC.3.2.1 An apparatus to achieve test pieces with two smooth and parallel surfaces by cutting.C.3.2.2 Electrically heated air ovenC.3.2.3 Clean, sharp, undamaged blanking die with
44、 blanking press suitable for cutting test pieces(38,0 2,5) mm x (13,0 0,8) mm or other suitable devices.In case of sheath thickness greater than 2,0 mm the sample thickness must be reduced by suitable meansto the value specified in C.3.3.C.3.2.4 Dial gauge, with spherical measuring inset (ball-diame
45、ter: at least 3 mm) pressure of 0,3 N to1,5 N.C.3.2.5 Notching device as in Figure C.1 with blades as in Figure C.2.C.3.2.6 Bending clamp assembly as in Figure C.3 with vice or other suitable device ensuring thesymmetrical closing of the clamping jaws.C.3.2.7 Transfer tool assembly as in Figure C.4
46、for shifting in one operation the bent test piece(s) from thebending clamp to the brass channel.C.3.2.8 Brass channel specimen holder as in Figure C.5 for accommodating ten bent test pieces.C.3.2.9 Hard glass test tubes 200 mm x 32 mm for accommodating the brass channel specimen holder withthe bent
47、test specimens. The tubes are plugged by suitable aluminium foil wrapped corks (see Figure C.6).C.3.2.10 Reagent: 10 % aqueous solution of Igepal CO-630 or Antarox CO-630 or equivalent reagent.The reagent shall be used only once.C.3.2.11 A heated container of sufficient size and depth to accept rack
48、s which will hold the filled test tubes(Figure C.6). The temperature shall be maintained at (50 0,5) C by means of suitable equipment. Thethermal capacity shall be high enough to ensure that the temperature does not drop below 49 C even whenthe test tubes are inserted.BS EN 50290-2-24:2002+A1:2008EN
49、 50290-2-24:2002+A1:2008- 20 -C.3.3 SamplesExamination of the PE cable sheaths. The surfaces shall not show any swellings, dents or holes.The apparatus as in C.3.2.1 is used to prepare strips with two parallel surfaces from the cable sheath. Thesamples should be taken in direction of the cable axis and approximately in the middle of the test piece,with a thickness of 1,8 mm, and from these strips 10 test pieces are prepared as in C.3.2.3. The thickness ofthese test pieces, measured using the dial gauge as in
