Scaffold planks must be able to support how many times their maximum intended load without failure?
Correct Answer
C) 4 times the maximum load
OSHA requires scaffold planks to support at least 4 times the maximum intended load as the safety factor. This provides adequate margin for dynamic loading and material variations.
Why This Is the Correct Answer
OSHA 29 CFR 1926.451(a)(1) specifically requires that scaffold planks must be capable of supporting at least 4 times the maximum intended load without failure. This 4:1 safety factor accounts for dynamic loading conditions, material degradation over time, and variations in material strength. The safety factor ensures that even under unexpected stress conditions or when materials don't meet exact specifications, the scaffold will remain safe for workers.
Why the Other Options Are Wrong
Option A: 3 times the maximum load
A 5:1 safety factor exceeds OSHA requirements and would be unnecessarily conservative, potentially leading to overengineered and more expensive scaffold systems.
Option B: 5 times the maximum load
A 2:1 safety factor is insufficient for scaffold planks as it doesn't provide adequate margin for the dynamic loading and impact forces that scaffolds experience during construction work.
Memory Technique
Use the mnemonic 'FOUR FLOORS' - scaffold planks (the floors workers stand on) must support FOUR times their intended load
Reference Hint
OSHA 29 CFR 1926.451 - Scaffolds General Requirements, specifically subsection (a)(1) covering structural integrity requirements
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