BS EN IEC 61400-8:2024

1   Scope

  This part of [IEC 61400](/search?q=IEC%C2%A061400)
   outlines the minimum requirements for the design of wind turbine nacelle-based structures
  and is not intended for use as a complete design specification or instruction manual.
  This document focuses on the structural integrity of the structural components constituted
  within and in the vicinity of the nacelle, including the hub, mainframe, main shaft,
  associated structures of direct-drives, gearbox structures, yaw structural connection,
  nacelle enclosure. It also addresses connections of the structural components to control
  and protection mechanisms, as well as structural connections of electrical units and
  other mechanical systems. This document focuses primarily on ferrous material-based
  nacelle structures but can apply to other materials also as appropriate. The design
  of bolted and welded joints in the nacelle structures is included, as well as cast
  and forged components. Material testing requirements to use in the design process
  for nacelle structures are specified. While the structural connections of the gearbox
  and the main shaft are in the scope, the design of the gears and bearings are not
  included. 
The safety level of the wind turbine designed according to this document shall be
  at or exceed the level inherent in [IEC 61400‑1:2019](/catalog/IEC%2061400-1%3A2019). Probabilistic methods to calibrate partial safety factors and for use in the design
  process are provided.