International ISO Standard ISO 5474-3 First edition Electrically propelled road 2024-06 vehicles Functional and safety requirements for power transfer between vehicle and external electric circuit - Part 3: DC power transfer Vehicules routiers a propulsion électrique - Exigences fonctionnelles et exigences de sécurite pour le transfert de puissance entre le véhicule et le circuit électrique externe - Partie 3: Transfert de puissance DC Reference number ISO 5474-3:2024(en) @ ISO 2024 IS0 5474-3:2024(en) COPYRIGHT PROTECTED DOCUMENT @ IS02024 be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on or ISo's member body in the country of the requester. ISO copyright office CP 40i : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Email: copyright@iso.org Website: www.iso.org Published in Switzerland @ IS0 2024 - All rights reserved i IS0 5474-3:2024(en) Contents Page Foreword. V 1 Scope ..1 2 Normative references .1 3 Terms and definitions. .2 .3 4 System architecture 5 ..3 Environmental and operational conditions 6 .3 Safety requirements. ..3 6.1 General. 6.2 Protection of persons against electric shock ..4 6.2.1 General 6.2.2 Compatibility with external safety devices .4 .5 6.2.3 Insulationresistance 6.2.4 Touch current ..5 6.2.5 Insulation coordination. ..6 Protective conductor. ..6 6.2.6 6.2.7 Basic protection when connected to an external electric circuit .7 6.2.8 Requirements for unmated vehicle contacts 6.2.9 Withstand capability during insulation resistance check before charging .7 6.2.10 Monitoring continuity of protective conductor. 6.2.11 Insulation resistance monitoring system. .7 6.3 Protection against thermal incident. ..8 Requirements for normal operation. ..8 6.3.1 6.3.2 Overcurrent protection. ..8 Residual energy after disconnection related to thermal incident ..9 6.3.3 6.3.4 .9 Arcprotection. 6.3.5 Voltage withstand capability. .10 6.3.6 Voltage class B contact temperature .10 6.4 Vehicle movement. ..11 6.5 AC or DC electric power at the same contacts ..11 7 Electromagnetic compatibility (EMC) ..12 8 Protection in case of unintended power transfer .12 9 Functional requirements .12 9.1 General .12 9.2 ..12 Disconnection device. 9.3 Control pilot functions. 13 9.4 Compatibility with external insulation monitoring ..13 9.5 Specific requirements for the vehicle inlet. .13 9.6 Control of the latching device of the vehicle coupler 13 ..13 10 Additional requirements for reverse power transfer. 11 Owner's manual and marking ..14 12 Test procedure ..14 12.1 General ..14 12.2 Resistance of protective conductor 12.3 .14 Insulationresistance. 12.4 Withstand voltage test .14 12.4.1 Withstand voltage test between voltage class B contacts and electric chassis / PE. ..14 12.4.2 Differential mode overvoltage withstand test for vehicle power supply circuit .14 12.4.3 Withstand voltage test - reversed voltage during insulation resistance check ..15 12.5 Touch current. .16 12.6 Voltage class B contact over temperature ..17 @ IS0 2024 - All rights reserved iii