1、 INTERNATIONAL STANDARD IEC60708 First edition2005-06 Low-frequency cables with polyolefin insulation and moisture barrier polyolefin sheath Reference number IEC 60708:2005(E)Publication numbering As from 1 January 1997 all IEC publications are issued with a designation in the 60000 series.For examp
2、le,IEC 34-1 is now referred to as IEC 60034-1.Consolidated editions The IEC is now publishing consolidated versions of its publications.For example,edition numbers 1.0,1.1 and 1.2 refer,respectively,to the base publication,the base publication incorporating amendment 1 and the base publication incor
3、porating amendments 1 and 2.Further information on IEC publications The technical content of IEC publications is kept under constant review by the IEC,thus ensuring that the content reflects current technology.Information relating to this publication,including its validity,is available in the IEC Ca
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6、 publications,withdrawn and replaced publications,as well as corrigenda.IEC Just Published This summary of recently issued publications(www.iec.ch/online_news/justpub)is also available by email.Please contact the Customer Service Centre(see below)for further information.Customer Service Centre If yo
7、u have any questions regarding this publication or need further assistance,please contact the Customer Service Centre:Email:custserviec.ch Tel:+41 22 919 02 11 Fax:+41 22 919 03 00 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.INTERN
8、ATIONAL STANDARD IEC60708 First edition2005-06 Low-frequency cables with polyolefin insulation and moisture barrier polyolefin sheath IEC 2005 Copyright-all rights reserved No part of this publication may be reproduced or utilized in any form or by any means,electronic or mechanical,including photoc
9、opying and microfilm,without permission in writing from the publisher.International Electrotechnical Commission,3,rue de Varemb,PO Box 131,CH-1211 Geneva 20,SwitzerlandTelephone:+41 22 919 02 11 Telefax:+41 22 919 03 00 E-mail:inmailiec.ch Web:www.iec.ch U For price,see current cataloguePRICE CODE C
10、ommission Electrotechnique InternationaleInternational Electrotechnical Commission?2 60708 IEC:2005(E)CONTENTS FOREWORD.4 1 Scope.6 2 Normative references.6 3 Quality assurance.7 4 Cable construction.7 4.1 Conductor.7 4.1.1 Conductor material.7 4.1.2 Type of conductor.7 4.1.3 Conductor-finish.7 4.1.
11、4 Continuity of conductor.7 4.2 Insulation.8 4.2.1 Insulation material.8 4.2.2 Insulation thickness.8 4.2.3 Colour of insulated conductor.8 4.3 Cabling element.8 4.4 Stranding.8 4.5 Colour code.8 4.5.1 General.8 4.5.2 Sub-units,units and cables up to and including 100 pairs or 100 quads.9 4.5.3 Cabl
12、es of more than 100 pairs or 100 quads.9 4.6 Spare pairs or quads.10 4.7 Filling.10 4.8 Core protection.10 4.9 Sheath.10 4.9.1 Sheath material.10 4.9.2 Application of the sheath.10 4.10 Cable protection.11 4.11 Finished cable.11 4.11.1 Overall diameter.11 4.11.2 Sheath marking.11 4.11.3 Sealing of e
13、nds.12 4.12 Delivery.12 5 Mechanical requirements.12 5.1 Conductor.12 5.2 Insulation.12 5.3 Sheath.12 5.3.1 Tensile strength and elongation.12 5.3.2 Adhesion of aluminium tape to the polyethylene.12 5.3.3 Adhesion of aluminium tape at the overlap.13 5.4 Finished cable.13 5.4.1 Sheath integrity.13 5.
14、4.2 Resistance to water penetration.13 5.4.3 Cable drip.13 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.60708 IEC:2005(E)3 6 Thermal stability and environmental requirements.13 6.1 Insulation.13 6.1.1 Thermal oxidative stability(OIT
15、-test).13 6.1.2 Shrinkage.14 6.1.3 Wrapping test of insulation after thermal aging.14 6.1.4 Bending test at low temperature.14 6.2 Sheath.14 6.2.1 Elongation at break after ageing.14 6.2.2 Resistance to weathering.14 6.2.3 Resistance to environmental stress cracking.14 7 Electrical requirements.14 7
16、.1 General.14 7.2 Electrical resistance of conductor.14 7.3 Electrical resistance unbalance.15 7.4 Dielectric strength.15 7.5 Insulation resistance.15 7.6 Mutual capacitance.15 7.7 Capacitance unbalance.16 7.8 Transmission characteristics(when used for digital communication).17 7.8.1 Attenuation.17 7.8.2 Near End Crosstalk(NEXT).17 7.8.3 Equal Level Far-end Crosstalk(ELFEXT).17 7.8.4 Power sum(PS)of crosstalk loss.17 7.8.5 Characteristic impedance.17 7.8.6 Velocity of propagation.17 Annex A(norm
