Your crew is working on scaffolding 15 feet high. According to OSHA 1926.451, what is the maximum spacing allowed between guardrails?
Correct Answer
B) 21 inches
OSHA 1926.451 requires guardrails on scaffolding to have a maximum spacing of 21 inches between the top rail and midrail. This prevents workers from falling through the opening.
Why This Is the Correct Answer
OSHA 1926.451(e)(2) specifically states that the maximum vertical spacing between guardrails on scaffolding must not exceed 21 inches. This regulation applies to all scaffolding systems regardless of height when guardrails are required. The 21-inch maximum ensures that workers cannot accidentally fall through the opening between rails, providing adequate protection while maintaining practical access for materials and tools.
Why the Other Options Are Wrong
Option A: 25 inches
25 inches exceeds OSHA's maximum allowed spacing of 21 inches and would create a safety violation
Option C: 30 inches
30 inches significantly exceeds OSHA's maximum allowed spacing and would create a dangerous gap that workers could fall through
Option D: 18 inches
18 inches is below the maximum allowed spacing, so while it would be compliant, it's not the maximum spacing that OSHA allows
Memory Technique
Think '21 to stay free' - 21 inches maximum spacing keeps workers free from fall hazards through guardrail openings
Reference Hint
OSHA Construction Standards 29 CFR 1926.451 - Scaffolds, specifically subsection (e)(2) regarding guardrail systems
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