| basic extreme wind speed parameter used for defining wind turbine classes.
NOTE 1 – Other design related climatic parameters are derived from the reference wind speed and other basic class parameters
NOTE 2 – A turbine designed for a wind turbine class corresponding to a reference wind speed, is designed to withstand climates for which the extreme 10 min average wind speed with a recurrence period of 50 years at turbine hub height is lower than or equal to the reference wind speed.
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