Final answer:
The minimum overlap of planking on a scaffold over supports must be at least 12 inches for safety reasons unless it is otherwise restrained.
Step-by-step explanation:
On scaffolds where you are trying to create a long platform, the overlap of planking shall only occur over supports and will not be less than 12 inches, unless the planking is nailed together or otherwise restrained from movement. When setting up a scaffold, it is crucial to ensure the safety and stability of the structure, and proper overlap of planking is a key consideration. A minimum overlap of 12 inches is mandated for safety reasons, to prevent planks from tipping or becoming unstable, which could lead to hazardous conditions for individuals working on or around the scaffold.