1 Scope
This Part of GB/T 17889 specifies the general design features, requirements and test methods for portable ladders.
This Part is applicable to the portable ladders.
This Part does not apply to step stools or ladders for specific professional use such as firebrigade ladders, roof ladders and mobile ladders.
This Part does not apply to ladders used for work on or near live electrical systems or installations. For this purpose, GB/T 17620 applies.
Note 1: This Part is intended to be used in conjunction with GB/T 17889.1.
Note 2: For single or multiple hinge joint ladders, see GB/T 17889.4.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
Foreword II
Introduction IV
1 Scope
2 Normative References
3 Terms and Definitions
4 Requirements
4.1 General
4.2 Materials
4.3 Design
4.4 Surface finish
4.5 Hinges (turning points)
4.6 Opening restraints
4.7 Rungs/steps/platforms
4.8 Platform
4.9 Antiskid devices
4.10 Extending and sectional ladders
5 Testing
5.1 General
5.2 Strength test of stiles
5.3 Bending test of the stiles
5.4 Lateral deflection test of the ladder
5.5 Bottom stile ends test
5.6 Vertical load on rungs, steps and platforms
5.7 Torsion test of rungs and steps
5.8 Test of opening restraints and hinges of standing ladders
5.9 Test for ladder rung/step hooks of extending ladders and combination ladders
5.10 Kick-up test of the platform of standing ladders
5.11 Feet pull test
5.12 Test on hand/kneerails
5.13 Maximum extension of ladder
5.14 3-part combination ladder in A-position test
5.15 Torsion on ladder length
5.16 Test methods for plastic ladders
6 Marking and User Instructions
7 Certification
Appendix A (Normative) Test Sequence
Bibliography
1 Scope
This Part of GB/T 17889 specifies the general design features, requirements and test methods for portable ladders.
This Part is applicable to the portable ladders.
This Part does not apply to step stools or ladders for specific professional use such as firebrigade ladders, roof ladders and mobile ladders.
This Part does not apply to ladders used for work on or near live electrical systems or installations. For this purpose, GB/T 17620 applies.
Note 1: This Part is intended to be used in conjunction with GB/T 17889.1.
Note 2: For single or multiple hinge joint ladders, see GB/T 17889.4.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
Contents of GB/T 17889.2-2012
Foreword II
Introduction IV
1 Scope
2 Normative References
3 Terms and Definitions
4 Requirements
4.1 General
4.2 Materials
4.3 Design
4.4 Surface finish
4.5 Hinges (turning points)
4.6 Opening restraints
4.7 Rungs/steps/platforms
4.8 Platform
4.9 Antiskid devices
4.10 Extending and sectional ladders
5 Testing
5.1 General
5.2 Strength test of stiles
5.3 Bending test of the stiles
5.4 Lateral deflection test of the ladder
5.5 Bottom stile ends test
5.6 Vertical load on rungs, steps and platforms
5.7 Torsion test of rungs and steps
5.8 Test of opening restraints and hinges of standing ladders
5.9 Test for ladder rung/step hooks of extending ladders and combination ladders
5.10 Kick-up test of the platform of standing ladders
5.11 Feet pull test
5.12 Test on hand/kneerails
5.13 Maximum extension of ladder
5.14 3-part combination ladder in A-position test
5.15 Torsion on ladder length
5.16 Test methods for plastic ladders
6 Marking and User Instructions
7 Certification
Appendix A (Normative) Test Sequence
Bibliography
