1、 IEC 61156-3Edition 3.0 2008-11INTERNATIONAL STANDARD Multicore and symmetrical pair/quad cables for digital communications Part 3:Work area cable Sectional specification IEC 61156-3:2008(E)LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BURE
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9、22 919 03 00 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.IEC 61156-3Edition 3.0 2008-11INTERNATIONAL STANDARD Multicore and symmetrical pair/quad cables for digital communications Part 3:Work area cable Sectional specification INTE
10、RNATIONAL ELECTROTECHNICAL COMMISSION NICS 33.120.20 PRICE CODEISBN 2-8318-1013-5 Registered trademark of the International Electrotechnical Commission LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.2 61156-3 IEC:2008(E)CONTENTS FOREW
11、ORD.4 1 General.6 1.1 Scope.6 1.2 Normative references.6 1.3 Installation considerations.6 2 Definitions,materials and cable construction.6 2.1 Definitions.6 2.2 Materials and cable construction.7 2.2.1 General remarks.7 2.2.2 Cable construction.7 2.2.3 Conductor.7 2.2.4 Insulation.7 2.2.5 Colour co
12、de of insulation.7 2.2.6 Cable element.7 2.2.7 Screening of the cable element.7 2.2.8 Cable make-up.8 2.2.9 Screening of the cable core.8 2.2.10 Sheath.8 2.2.11 Colour of sheath.8 2.2.12 Identification.8 2.2.13 Finished cable.8 3 Characteristics and requirements.8 3.1 General remarks.8 3.2 Electrica
13、l characteristics.9 3.2.1 Conductor resistance.9 3.2.2 Resistance unbalance.9 3.2.3 Dielectric strength.9 3.2.4 Insulation resistance.9 3.2.5 Mutual capacitance.9 3.2.6 Capacitance unbalance.9 3.2.7 Transfer impedance.9 3.3 Transmission characteristics.9 3.3.1 Velocity of propagation(phase velocity)
14、.9 3.3.2 Attenuation.10 3.3.3 Unbalance attenuation.10 3.3.4 Near-end crosstalk(NEXT).10 3.3.5 Characteristic impedance.11 3.3.6 Structural Return Loss(SRL).11 3.4 Mechanical and dimensional characteristics and requirements.12 3.4.1 Dimensional requirements.12 3.4.2 Elongation at break of the conduc
15、tors.12 3.4.3 Elongation at break of the insulation.12 3.4.4 Elongation at break of the sheath.12 3.4.5 Tensile strength of the sheath.12 3.4.6 Crush test of the cable.12 3.4.7 Impact test of the cable.12 3.4.8 Repeated bending of the cable.12 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL
16、USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.61156-3 IEC:2008(E)3 3.4.9 Tensile performance of the cable.13 3.5 Environmental characteristics.13 3.5.1 Shrinkage of insulation.13 3.5.2 Wrapping test of insulation after thermal ageing.13 3.5.3 Bending test of insulation at low temperature.13 3.5.4 Elongation at break of the sheath after ageing.13 3.5.5 Tensile strength of the sheath after ageing.13 3.5.6 Sheath pressure test at high temperature.13 3.5.7 Cold bend test of the cable.13 3
