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GB/T 17889.5-2025: Ladders - Part 5: Telescopic ladders
Status: Valid GB/T 17889.5: Evolution and historical versions
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Ladders - Part 5: Telescopic ladders
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GB/T 17889.5-2025
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| GB/T 17889.5-2019 | English | 439 |
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Ladders -- Part 5: Telescopic ladders
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GB/T 17889.5-2019
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Basic data | Standard ID | GB/T 17889.5-2025 (GB/T17889.5-2025) | | Description (Translated English) | Ladders - Part 5: Telescopic ladders | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J09 | | Classification of International Standard | 13.110 | | Word Count Estimation | 24,213 | | Date of Issue | 2025-05-30 | | Date of Implementation | 2025-09-01 | | Older Standard (superseded by this standard) | GB/T 17889.5-2019 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 17889.5-2025: Ladders - Part 5: Telescopic ladders---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 13.110
CCSJ09
National Standard of the People's Republic of China
Replaces GB/T 17889.5-2019
Ladders Part 5.Telescopic ladders
Released on 2025-05-30
2025-09-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Table of contents
Preface III
Introduction IV
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Functional size 3
4.1 Basic dimensions 3
4.2 Spacing between footrests and pedals 3
4.3 Top Tread/Pedal Clearance 3
4.4 Crossbar type balance bar 4
5 Requirements 5
5.1 General requirements 5
5.2 Strength requirements 5
5.3 Durability 8
5.4 Opening and closing cycle 8
5.5 Plastic ladder 9
6 Test methods 9
6.1 General 9
6.2 Tipping test 9
6.3 Ladder frame strength test 9
6.4 Ladder frame bending test 9
6.5 Ladder frame lateral deflection test 9
6.6 Ladder frame bottom end test 9
6.7 Vertical load test of the rungs/pedals/platforms 10
6.8 Tread/pedal torsion test 12
6.9 Tread/Pedal Pull-out Test 12
6.10 Free-standing telescopic ladder opening limit and hinge test 12
6.11 Bottom slip test of leaning telescopic ladder 12
6.12 Locking mechanism test 12
6.13 Hinge cycle test 13
6.14 Ladder foot pull-out test 13
6.15 Ladder lengthwise torsion test 13
6.16 Durability test 14
6.17 Opening and closing cycle test 16
6.18 Additional tests for plastic ladders 16
7 Usage Information16
7.1 General requirements 16
7.2 Identification 16
7.3 User Manual 17
Appendix A (Normative) Test sequence 18
References 19
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document is Part 5 of GB/T 17889 "Ladders". GB/T 17889 has published the following parts.
--- Part 1.Terminology, type and functional dimensions;
--- Part 2.Requirements, tests and marking;
--- Part 3.Information for use;
--- Part 4.Hinged ladders;
--- Part 5.Telescopic ladders;
--- Part 6.Movable platform ladders.
This document replaces GB/T 17889.5-2019 "Ladders Part 5.Telescopic ladders". This document is consistent with GB/T 17889.5-2019.
In addition to structural adjustments and editorial modifications, the main technical changes are as follows.
--- Changed the scope of application of the document (see Chapter 1, Chapter 1 of the.2019 edition);
--- Changed the terms and definitions of crossbar stabilizer (see 3.11, 3.13 of the.2019 edition);
--- Changed the dimensional requirements for the crossbar type stabilizing bar (see 4.4, 4.3 of the.2019 edition);
--- Changed the requirements for telescopic ladders (see Chapter 5, Chapter 5 of the.2019 edition);
--- Changed the ladder frame strength test (see 6.3, 6.3 of the.2019 edition);
--- Changed the ladder frame bottom test (see 6.6, 6.6 of the.2019 edition);
--- Changed the bottom slip test of leaning ladder (see 6.11, 6.11 of the.2019 edition);
--- Changed the torsion test in the length direction of the ladder (see 6.15, 6.14 of the.2019 edition);
--- The durability test has been changed (see 6.16, 6.17 of the.2019 edition).
--- The test order has been changed (see Appendix A, Appendix A of the.2019 edition).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document is proposed and coordinated by the National Technical Committee for Machinery Safety Standardization (SAC/TC208).
This document was drafted by. Ningbo Xingfu Tools Co., Ltd., Guangdong Wanyi Home Furnishing Co., Ltd., Zhejiang Aopeng Industry and Trade Co., Ltd.,
Suzhou Feihua Aluminum Industry Co., Ltd., Suzhou Zhongchuang Aluminum Co., Ltd., Yongkang Weige Industry and Trade Co., Ltd., Zhejiang Yongan Deli Industry and Trade Co., Ltd.
Co., Ltd., China Machinery Research Institute of Standards and Technology (Beijing) Co., Ltd., Tianjin Jinmao Home Furnishing Co., Ltd., Shanghai Ruiju Metal Products Co., Ltd.
Ltd., Yongkang Jinou Machinery Co., Ltd., Shenyang Yongpan Metal Products Co., Ltd., Ningbo Xinyiyuan Aluminum Co., Ltd., Nanjing Forestry
University, Suzhou Fushunhong Electronics Co., Ltd., Sichuan Shuxing Youchuang Security Technology Co., Ltd., Guangdong Communications Industry Service Co., Ltd., GAC
Honda Motor Co., Ltd., Yiwu Jinglong Mould Co., Ltd., and Nan'an China Machinery Standardization Research Institute Co., Ltd.
The main drafters of this document are. Tao Junfu, Li Jiatao, Chen Miaoren, Zhang Xiuzhuo, Bao Minghua, Xu Fengge, Ye Anmin, Zhang Xiaofei, Li Jie,
Cai Baorong, Zhang Xi, Chen Mingzhen, Ju Ronghua, Chen Jingjing, Jiang Jinghua, Qin Peijun, Jiang Jiesheng, Yang Yi, Liu Zhiyong, Wang Jing, Dong Kaibo, Li Qin, Zhu Bin,
Zhang Peng, Zhang Yu, Zhang Qun, Cai Qiang, Li Fengming, Cheng Hongbing, Xu Haozhi, Gong Lihua, Zheng Huating, and Zhang Yan.
This document was first published in.2019 and this is the first revision.
Introduction
Ladder is a commonly used safety facility for climbing. GB/T 17889 aims to improve the quality and safety level of ladder-related products and ensure
User safety is planned to consist of 7 parts.
--- Part 1.Terminology, types and functional dimensions. The purpose is to coordinate the standards related to ladders and give the commonly used terms, types and functional dimensions of ladders.
The functional dimensions that affect the quality and safety level of the ladder, as well as the design and testing required.
--- Part 2.Requirements, tests and marking. The purpose is to ensure the safety level of ladders and to identify factors that affect the quality and safety level of ladders.
The requirements for elements are specified and corresponding test methods are given.
--- Part 3.Usage information. The purpose is to ensure that users can use the ladder correctly according to the signs and instructions and to
The requirements for labels that serve as warnings during the use of the product, as well as the information and expression methods that need to be given in the instructions.
--- Part 4.Hinged ladders. The purpose is to ensure the quality and safety level of hinged ladders and to specify special requirements for hinged ladders.
--- Part 5.Telescopic ladders. The purpose is to ensure the quality and safety level of telescopic ladders and to specify special requirements for telescopic ladders.
--- Part 6.Movable platform ladders. The purpose is to ensure the quality and safety level of movable platform ladders.
Ladders have special requirements.
--- Part 7.Detachable platform ladder. The purpose is to ensure the quality and safety level of detachable platform ladders.
Ladders have special requirements.
Ladders Part 5.Telescopic ladders
1 Scope
This document specifies the functional dimensions, requirements and test methods for telescopic ladders.
This document applies to telescopic ladders with a length not exceeding 5m when fully extended.
This document does not apply to extension ladders.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 17889.1-2021 Ladders Part 1.Terminology, types and functional dimensions
GB/T 17889.2-2021 Ladders Part 2.Requirements, tests and marking
GB/T 17889.3-2024 Ladders Part 3.Usage Information
GB/T 17889.4-2024 Ladders Part 4.Hinged ladders
3 Terms and definitions
The terms and definitions defined in GB/T 17889.1-2021 and the following apply to this document.
3.1
Telescopic ladder
A ladder consisting of three or more treads/steps with a retractable ladder frame.
Note 1.See Figure 1 for an example of a telescopic ladder.
Note 2.Extension ladders defined in 3.2.1.3 of GB/T 17889.1-2021 are not within the scope of this document.
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