IEC 61400-1:2019,Wind energy generation systems - Part 1: Design requirements.IEC 61400-1:2019 pdf free download here. IEC 61400-1:2019 specifies essential design requirements to ensure the structural integrity of wind turbines. The purpose of IEC 61400-1:2019 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...