What is one requirement for scaffolds to maintain safety?

Planking must be complete is a fundamental requirement for ensuring the safety of scaffolds. When scaffolds are constructed, the planks provide crucial support for workers and materials. Incomplete planking can lead to gaps or instability, increasing the risk of falls or accidents due to slips. Complete planking ensures there is a stable surface for workers to stand on, reducing potential hazards associated with working at height.

Regarding the other options, spacing between planks is important, but it is the completeness of the planking that primarily reinforces worker safety. Single-level railing might not provide adequate protection for workers at height, as multiple levels of railings are often necessary to ensure maximum safety. Lastly, adequate access and climbing protection is essential for preventing falls, so lacking such protection would compromise safety rather than uphold it.