This part of IEC 61400 specifies essential design requirements to ensure the structural 
integrity of wind turbines. Its purpose is to provide an appropriate level of protection against 
damage from all hazards during the planned lifetime. 
This document is concerned with all subsystems of wind turbines such as control and 
protection functions, internal electrical systems, mechanical systems and support structures. 
This document applies to wind turbines of all sizes. For small wind turbines, IEC 61400-2 can 
be applied. IEC 61400-3-1 provides additional requirements to offshore wind turbine 
installations. 
This document is intended to be used together with the appropriate IEC and ISO standards 
mentioned in Clause 2.dition 4.0 2019-02 INTERNATIONAL STANDARD colour inside Wind energy generation systems – Part 1: Design requirements IEC 61400-1:2019-02(en) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright ？ 2018 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without perm