What piece of equipment must support four times the maximum intended load and be higher than 10 feet?

The requirement for equipment to support four times the maximum intended load and to be higher than 10 feet directly pertains to scaffolding. Scaffolding is a temporary structure used to support a work crew and materials during the construction or repair of buildings and other large structures. It is designed to ensure the safety of workers who operate at significant heights.

The reason scaffolding must support such a high load factor—four times the maximum intended load—is due to safety standards. These standards are in place to account for unexpected conditions, such as additional tools, materials, or the weight of workers that could be on the scaffolding at any given time. Higher safety margins are essential especially when working at height to prevent catastrophic failures.

While ladders, lifts, and platforms have their own safety regulations, they are not specifically required to meet the same stringent load factors as scaffolding, nor are they always used in situations involving heights of 10 feet or more. For instance, ladders are typically used for lower heights, and while lifts can reach greater heights, they are not required to support multiple loads in the same manner as scaffolding. Therefore, scaffolding is the correct option as it aligns perfectly with the described safety requirements and application context.