ISO INTERNATIONAL STANDARD 14122-4 Second edition 2016-06-01 Safety of machinery Permanent means of access to machinery - Part 4: Fixed ladders Sécurité des machines - Moyens d'acces permanents aux machines- Partie 4: Echelles fixes Reference number ISO 14122-4:2016(E) ISO International Organization for Standardization @ IS0 2016 =ZHEJIANG INST OF STANDARDIZATION C1 5956617 vided by IHS under I itted without license from IHS IS0 14122-4:2016(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2016, 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. ISO copyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org Intenationaibr PrganizationforStandardization ensee-ZHEJIANG INST OF STANDARDIZRoISQ ,6 - All rights reserved etworking permitted without license from IHS IS0 14122-4:2016(E) Contents Page Foreword ..V Introduction. ...vi 1 Scope 2 Normative references 3 Terms and definitions 4 Selection and design of ladder systems 4.1 General .6 4.1.1 Design and construction 4.1.2 Choice depending on available space. 6 4.1.3 Spacing between the ladder and any permanent obstruction 4.2 Choice of a type fall protection device 7 4.2.1 Necessityofafallprotectiondevice 4.2.2 Types of fall protection devices. .7 4.2.3 Guidance for a risk assessment. ..8 4.3 Height of ladder flights and fall protection device .8 4.3.1 Limits of space .8 4.3.2 Ladder systems >3 000 mm and ≤10 000 mm total height, H ..8 4.3.3 Ladder systems >10 000 mm total height, H. .9 4.4 Platforms and landings. 4.4.1 Installation of platforms at arrival and departure areas 9 4.4.2 Arrangement of platforms and landings for ladders with a total height, H >10 000 mm .9 5 Specific requirements of ladder systems .10 5.1 General requirements .10 5.1.1 Permanent action (dead load) ..10 5.1.2 Variable action (rated load) ..11 5.1.3 Additional loading. 5.1.4 Design .14 5.2 Ladder with two stiles .14 5.2.1 Strength ..14 5.2.2 Rungs. ..14 5.2.3 Connection of ladder and guard-rail .17 5.3 Ladder with one stile .17 5.3.1 Strength ..17 5.3.2 Rungs ..18 5.4 Departure and arrival areas. .19 5.4.1 General requirements. .19 5.4.2 Departure area (entrance) 19 5.4.3 Arrival area (exit) .19 5.4.4 Access opening. .19 5.4.5 Trap doors.. .21 5.5 Fall protection device. 22 5.5.1 Safety cage. .22 5.5.2 Fall arrester .26 5.6 Platforms and landings .26 5.6.1 Access platforms .26 5.6.2 Intermediate and rest platforms 26 5.6.3 Intermediate landings 27 5.6.4 Moveable rest landings 29 5.7 Requirements on moveable parts of fixed ladders 30 6 Verification of safety requirements ..30 6.1 General. .30 iii ISee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 ed withoutlicense from IHS Not for Resale, 2016/7/20 07:48:00