EN IEC 61400-5:2020/prA1:2024

Amendment 1 - Wind energy generation systems - Part 5: Wind turbine blades

Windenergieanlagen - Teil 5: Rotorblätter von Windenergieanlagen

Systèmes de génération d'énergie éolienne - Partie 5: Pales d’éoliennes

Sistemi za proizvodnjo energije na veter - 5. del: Rotorski listi vetrnih turbin - Dopolnilo A1

General Information

• Status: Not Published
• Publication Date: 07-Dec-2025
• ICS: 27.180 - Wind turbine energy systems
• Technical Committee: CLC/TC 88 - Wind turbines
• Current Stage: 4060 - Enquiry results established and sent to TC, SR, BTTF - Enquiry
• Start Date: 09-Aug-2024
• Completion Date: 09-Aug-2024
• Ref Project: SIST EN IEC 61400-5:2020/oprA1:2024 - Amendment 1 - Wind energy generation systems - Part 5: Wind turbine blades

Relations

• Amends: EN IEC 61400-5:2020 - Wind energy generation systems - Part 5: Wind turbine blades
• Effective Date: 09-Apr-2024

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2024
Sistemi za proizvodnjo energije na veter - 5. del: Rotorski listi vetrnih turbin -
Dopolnilo A1
Amendment 1 - Wind energy generation systems - Part 5: Wind turbine blades
Windenergieanlagen - Teil 5: Rotorblätter von Windenergieanlagen
Systèmes de génération d'énergie éolienne - Partie 5: Pales d’éoliennes
Ta slovenski standard je istoveten z: EN IEC 61400-5:2020/prA1:2024
ICS:
27.180 Vetrne elektrarne Wind turbine energy systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

88/1020/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61400-5/AMD1 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2024-05-17 2024-08-09
SUPERSEDES DOCUMENTS:
88/1017/RR
IEC TC 88 : WIND ENERGY GENERATION SYSTEMS
SECRETARIAT: SECRETARY:
Denmark Mrs Christine Weibøl Bertelsen
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD

Other TC/SCs are requested to indicate their interest, if any, in this
CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of CENELEC, is
drawn to the fact that this Committee Draft for Vote (CDV) is submitted
for parallel voting.
The CENELEC members are invited to vote through the CENELEC
online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and
to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some Countries” clauses to be included
should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for submitting ISC clauses. (See AC/22/2007
or new GUIDANCE DOC).
TITLE:
Amendment 1 – Wind energy generation systems – Part 5: Wind turbine blades

PROPOSED STABILITY DATE: 2026
NOTE FROM TC/SC OFFICERS:
At the IEC TC 88 meeting held in Jeju Island, Korea the following decision was taken:

Decision 2(6): The option to go from NP with a CD attached directly to CDV stage shall not be used except in limited cases,
with explicit permission from the TC 88 officers. The intention to go from NP to CDV shall be indicated on the NP form.

The TC 88 Officers have on basis of this action taken the decision, that the CD stage will be skipped for the following reasons:

• The existing Maintenance Team (MT 5) has broad NC participation
• All MT 5 experts have had possibility to comment/be involved in the work
• The amendment does not contain any controversial items

electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.

IEC CDV 61400-5:2020/ 3 88/1020/CDV
AMD1© 2024
FOREWORD
88/1020/CDV 2 IEC CDV 61400-5:2020/88/1020/CDV
AMD1© 2024
1 INTRODUCTION
2 This amendment to IEC 61400-5:2020 removes conflicts with IECRE on the topic of certification and
3 addresses errors and lack of clarity in the original document.
IEC CDV 61400-5:2020/ 3 88/1020/CDV
AMD1© 2024
5 Scope
6 Delete: “, as well as to define requirements for certification.
7 With respect to certification, this document provides the detailed basis for fulfilling the current
8 requirements of the IECRE system, as well as other IEC standards relevant to wind turbine blades.
9 When used for certification, the applicability of each portion of this document should be determined
10 based on the extent of certification, and associated certification modules per the IECRE system”
11 Normative References
12 Delete: “ISO/IEC 17021-1, Conformity assessment – Requirements for bodies providing audit and
13 certification of management systems – Part 1: Requirements”
14 6 Design
15 6.4 Material requirements
16 6.4.2 Material properties for blade design
17 6.4.2.1 Characterization
18 Replace: “For certification purposes, the tests for establishing design values for structural verification
19 shall be performed according to requirements specified in the relevant certification scheme, e.g.:
20 an accredited test organization;
21 a company approved by a suitable certification agency;
22 a non-certified company witnessed by the certification agency.
23 With: “Test laboratories shall meet the technical requirements defined in ISO17025 or similar standards.”
24 6.6 Structural design
25 6.6.2 Structural analysis
26 6.6.2.3 Stability analysis
27 Replace: “Primary load-carrying structures (e.g., spar caps, shear webs, trailing edge spars) shall be
28 shown to be free of buckling when the structure is subjected to the design loads.”
29 With: “Primary load-carrying structures (e.g., spar caps, shear webs, trailing edge spars) shall be shown
30 to be free of buckling when the structure is subjected to the design loads. Buckling shall not occur in
31 any component under the characteristic load.”
32 6.6.3 Verification requirements
33 6.6.3.2 Validation of global model by testing
34 Replace: “For certification, a general validation of the design through a comparison with obtained results
35 from full scale blade testing applies. This includes as a minimum”
36 With: “When the design created in accordance with the requirements of this standard is validated
37 through a comparison with obtained results from full scale blade testing, the following applies:”
38 Replace: “Deviations of at most ± 7 % for the global bending deflection at the outermost loading station,
39 ± 5 % for the first natural frequencies in two main directions and ± 10 % for the axial strains are

88/1020/CDV 4 IEC CDV 61400-5:2020/88/1020/CDV
AMD1© 2024
40 permissible without further justification at load levels of the testing performed in accordance with IEC
41 61400-23.”
42 With: “Deviations of at most ± 7 % for the global bending deflection at the outermost loading station, ±
43 5 % for the first natural frequencies in two main directions and ± 10 % for the axial strains are permissible
44 without further justification at load levels of the testing performed in accordance with IEC 61400-23 or
45 other relevant standards.”
46 6.6.3.3 Validation of analytical models and methods
47 Delete “and/or certified”
48 6.6.4 Partial safety factors for materials
49 6.6.4.1 Definitions
50 Replace: “γ is the factor for load characterization.”
m5
51 With: “γ is the factor for load characterization.
m5
52 The combined partial safety factor for materials in this standard sh
...