Specifications for Substation Ascending Operation and Protective Device（DL/T 1209） is divided into four parts：
Part 1： Holding Bar Ladder， Ladder Utensil， Ladder Platform and Bridge.
Part 2： Demountable Maintenance Platform.
Part 3： Lift Maintenance Platform.
Part 4： Composite Quick-installed Scaffold.
This is part 4 of DL/T 1209.
This part is proposed by and under the jurisdiction of China Electricity Council（CEC）.

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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Technicalrequirements
5 Typetest
6 Acceptancetest
7 Preventive test
8 Inspectionrules
9 Packaging，transportation and storage
Annex A （informative） Swing fatigue test device

Specifications for Substation Ascending Operation and Protective Device（DL/T 1209） is divided into four parts：
Part 1： Holding Bar Ladder， Ladder Utensil， Ladder Platform and Bridge.
Part 2： Demountable Maintenance Platform.
Part 3： Lift Maintenance Platform.
Part 4： Composite Quick-installed Scaffold.
This is part 4 of DL/T 1209.
This part is proposed by and under the jurisdiction of China Electricity Council（CEC）.
The main development organizations： National Quality Supervision & Inspection Center of Electrical Equipment Safety Performance， State Grid Zhejiang Electric Power Corporation， and Shijiazhuang Feixiang Material Technology Co.， Ltd.
The main drafters： Li Rui， Pan Weiwei， Yu Hongyun， Wu Guowei， Dong Fei， Zhu Zhihua， Li Zhouxuan，Li Guoyong， Wang Liang， Yu Minbo， Qian Miao， Jin Hong， Zhao Pei， Pan Weijian， Cui Libing， Ye Cheng， Liu Wenfang， Li Wenxian， Ren Kai， Zhang Yi.
The main translation organizations of the English version： National Quality Supervision & Inspection Center of Electrical Equipment Safety Performance， State Grid Zhejiang Electric Power Co.， Ltd， and Kun Ming Feixiang Material Technology Co.， Ltd.
The main translators of the English version： Li Rui， Yu Hongyun， Ma Heng， Lin Xue， Qian Miao， Li Wenxian， Dong Fei， Zhao Pei， Dong Xuan， Zhang Yi.
In the implementation of this standard， if there are any comments or suggestions， please contact Standardization Management Center of China Electricity Council （No.l， Alley 2， Baiguang Rd.， Beijing，100761）.