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).