ISO INTERNATIONAL STANDARD 14118 Secondedition 2017-12 Safety of machinery Prevention of unexpected start-up Sécurité des machines - Prévention de la mise en marche intempestive Reference number IS0 14118:2017(E) so Copyright International Organization for Standardization @ IS0 2017 IS0 14118:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2017,Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. IsOcopyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +4122 749 09 47 copyright@iso.org www.iso.org Copyightilerational Organizationfor Standardization @ IS0 2017 - All rights reserved IS0 14118:2017(E) Contents Page Foreword ..iv Introduction ..V 1 Scope. .1 2 Normative references ..1 3 Terms and definitions ..1 4 General measures to prevent unexpected start-up .2 4.1 General .2 4.2 Manual measures for isolation and energy dissipation .3 4.3 Other means to prevent unexpected (unintended) start-up .3 4.4 Signalling and warning (delayed start). .3 5 Isolation and energy dissipation .3 5.1 Prevention of unexpected start-up upon restoration of any power supplies .3 5.2 Devices for isolation from power supplies .3 5.3 Locking (securing) devices 4 5.4 Devices for stored-energy dissipation or restraint (containment) .4 5.4.1 General 4 5.4.2 Mechanical elements. ..5 5.4.3 Locking or securing facilities for the restraint (containment) devices. .5 6 Other measures to prevent unexpected start-up .5 6.1 Design strategy .5 6.2 Measures to prevent unintended generation of start commands .6 6.2.1 Measures to prevent unintended actuation of manual start controls. .6 6.2.2 Design of safety-related parts of the control system 7 6.2.3 Selection and location of power control elements 7 6.3 Measurestomaintainstopcommands 7 6.3.1 Principle 7 6.3.2 Maintained stop command generated by a stop control device (level A) 7 6.3.3 Maintained stop command generated by machine control (level B/C). .8 6.3.4 Mechanical disconnection (level D; see Figure 1) .8 6.3.5 Moving-part immobilization (level E; see Figure 1) .8 6.4 Automatic monitoring of the safe state (stopped condition) during a category 2 stop .8 7 Design requirements for verification .8 7.1 General .8 7.2 Provisions for verifying isolation .9 7.3 Provisions for verifying energy dissipation or restraint (containment) Annex A (informative) Examples of tasks which can require the presence of persons in danger zones. .10 Bibliography .11 Copyight Intematioal OrgzISSaharaizAl rights reserved iii