UNE-EN IEC 61400-8:2025

The IEC 61400-8 outlines the minimum requirements for the design of wind turbine nacellebased structures and is not intended for use as a complete design specification or instructionmanual. This standard focuses on the engineering integrity of the structural componentsconstituted within and in the vicinity of the nacelle, including the hub, mainframe, main shaft,associated structures of direct-drives, gearbox structures, yaw structural connection, nacellecovering and other structural connections to subsystems of control and protection mechanisms,electrical units and mechanical systems. The standard focuses primarily on Ferrous materialbased nacelle structures, but can apply to other materials also as appropriate. The design ofbolted and welded joints in the nacelle structures is included, as well as cast and forgedcomponents. Material testing requirements to use in the design process for nacelle structuresare specified. Structures or components outside of the nacelle, such as the tower, foundationsor blades are not in the scope of this standard. Further, the standard does not address nonstructural components or systems such as hydraulics or electrical units. While the structuralconnections of the gearbox and the main shaft, are in scope, the design of the gears andbearings are not included.This standard shall be used together with the appropriate standards mentioned in Section 2. Inparticular, this standard is consistent with the requirements of IEC 61400-1 Ed.4. The safetylevel of the wind turbine designed according to this standard shall be at or exceed the levelinherent in IEC 61400-1 Ed.4. Probabilistic methods to calibrate partial safety factors and foruse in the design process are provided.