ISO 19642-2:2023

INTERNATIONAL ISO
STANDARD 19642-2
Second edition
2023-08
Road vehicles — Automotive cables —
Part 2:
Test methods
Véhicules routiers — Câbles automobiles —
Partie 2: Méthodes d'essai
Reference number
© ISO 2023
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Published in Switzerland
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Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 3
4 Specifications . 3
4.1 General test conditions . 3
4.1.1 General information on dimensional tests. 3
4.2 Safety concerns . 4
4.3 Ovens . 4
5 Test methods for single core cables.4
5.1 General . 4
5.2 Dimensional tests . . 4
5.2.1 Cable outside diameter . 4
5.2.2 Insulation thickness . 5
5.2.3 Conductor diameter . 5
5.2.4 Cross-sectional area (CSA) . 5
5.2.5 In-process cable outside diameter . 6
5.3 Electrical tests . 7
5.3.1 Conductor resistance . . 7
5.3.2 Determination of temperature coefficients . 8
5.3.3 Withstand voltage . 10
5.3.4 Withstand voltage after environmental testing . 11
5.3.5 Insulation faults . 11
5.3.6 Insulation volume resistivity .12
5.4 Mechanical tests .12
5.4.1 Strip force .12
5.4.2 Abrasion .13
5.4.3 Breaking force of the finished cable. 16
5.4.4 Cyclic bending . 17
5.4.5 Flexibility . 18
5.5 Environmental tests . 20
5.5.1 Test specimen preparation and winding tests . 20
5.5.2 Long term heat ageing, 3 000 h at temperature class rating .22
5.5.3 Short term heat ageing, 240 h at temperature class rating +25 °C .22
5.5.4 Thermal overload, 6 h at temperature class rating +50 °C .23
5.5.5 Pressure test at high temperature . 23
5.5.6 Shrinkage by heat .25
5.5.7 Low temperature winding . 25
5.5.8 Cold impact . 25
5.5.9 Temperature and humidity cycling . 27
5.5.10 Resistance to hot water .29
5.5.11 Resistance to liquid chemicals .30
5.5.12 Durability of cable marking . 32
5.5.13 Stress cracking resistance . 32
5.5.14 Resistance to ozone .33
5.5.15 Resistance to flame propagation .34
6 Test methods for sheathed and/or multi-conductor cables .35
6.1 General . 35
6.2 Dimensional tests . .36
6.2.1 Cable outside diameter . 36
6.2.2 Ovality of sheath .36
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6.2.3 Thickness of sheath. 36
6.2.4 In-process cable outside diameter .36
6.2.5 Lay length . 37
6.3 Electrical tests .38
6.3.1 Electrical continuity .38
6.3.2 Withstand voltage at final inspection .38
6.3.3 Screening effectiveness .38
6.3.4 Sheath fault on screened cables . 41
6.3.5 General information on electrical test setups of unscreened balanced cables . 42
6.3.6 General information on low frequency electrical tests .46
6.3.7 Resistance unbalance .46
6.3.8 Capacitance . 47
6.3.9 Inductance . .48
6.3.10 General information on high radio frequency (RF) electrical tests .48
6.3.11 Velocity of propagation . . 51
6.3.12 Characteristic impedance in frequency domain (CIF).55
6.3.13 Characteristic impedance in time domain (CIT) .56
6.3.14 Insertion loss, (IL) .58
6.3.15 Return loss, (RL) .58
6.3.16 Unbalance attenuations .58
6.3.17 Near-end crosstalk, NEXT . 59
6.3.18 Far-end crosstalk, FEXT . 59
6.3.19 PS alien near-end crosstalk, PS-ANEXT – exogenous crosstalk . 59
6.3.20 PS attenuation to alien far-end crosstalk ratio, PS-AACR-F - exogenous
crosstalk . 59
6.4 Mechanical tests .60
6.4.1 Strip force of sheath.
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