IEC 61400-1:2019/ISH1:2025

© IEC 2025
INTERNATIONAL ELECTROTECHNICAL COMMISSION
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IEC 61400-1
Edition 4.0  2019-02
WIND ENERGY GENERATION SYSTEMS –

Part 1: Design requirements
INTERPRETATION SHEET 1
This interpretation sheet has been prepared by IEC technical committee 88: Wind energy
generation systems.
The text of this interpretation sheet is based on the following documents:
DISH Report on voting
88/1065/DISH 88/1078/RVDISH
Full information on the voting for the approval of this interpretation sheet can be found in the
report on voting indicated in the above table.

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Question 1:
Subclause 6.4.2 mentions normal other environmental conditions that shall be taken into
account and, specifically speaking, an ambient temperature range of –10 °C to +40 °C. Does
this mean that the wind turbines shall be designed to operate at rated power up to 40 °C on the
maximum limit, or does it mean that the wind turbine can be designed to operate at any
maximum temperature limit below 40 °C, let's assume 35 °C or 32 °C, etc. ?

Answer 1:
The standard requires that turbines designed to one of the design classes stated in Table 1 in
Subclause 6.2 be capable of operating and generating at temperatures up to +40 °C. There is
no requirement that the turbine shall generate maximum rated power at +40 °C.

ICS 27.180
IEC 61400-1:2019-02/ISH1:2025-02(en-fr)

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