You are installing a guardrail system for fall protection. What is the minimum height requirement for the top rail?
Correct Answer
B) 42 inches
OSHA requires guardrail systems to have a top rail height of 42 inches (plus or minus 3 inches) above the walking/working level for effective fall protection.
Why This Is the Correct Answer
OSHA Standard 29 CFR 1926.501(b)(1) specifically requires guardrail systems to have a top rail height of 42 inches (plus or minus 3 inches) above the walking/working surface. This height has been established through extensive safety research to provide effective fall protection while allowing workers to comfortably lean against the rail. The 42-inch standard applies to all construction work where guardrails are required for fall protection, including scaffolds, platforms, and building edges.
Why the Other Options Are Wrong
Option A: 39 inches
39 inches is below the OSHA minimum requirement and would not provide adequate fall protection as it's too low to prevent workers from falling over the guardrail system.
Option C: 45 inches
45 inches exceeds the maximum allowable height of 45 inches (42 + 3) and could create ergonomic issues for workers who need to work near or lean against the guardrail.
Option D: 48 inches
48 inches is significantly above the OSHA maximum of 45 inches and would create safety hazards by being too high for effective use and potentially interfering with worker mobility.
Memory Technique
Remember '42' like the famous answer to life, the universe, and everything - it's also the answer to guardrail height requirements!
Reference Hint
OSHA Construction Standards 29 CFR 1926.501 - Duty to Have Fall Protection, or Florida Building Code Chapter 33 - Safeguards During Construction
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