A temporary edge guardrail is being checked before deck work resumes. What top-rail height is required for a conventional guardrail system?
Correct Answer
A) 42 in. plus or minus 3 in.
OSHA guardrail top edges are 42 in. plus or minus 3 in. above the walking or working level. Other choices use handrail heights, a rigid single number, or an overstatement not in the guardrail rule.
Why This Is the Correct Answer
OSHA guardrail top edges are 42 in. plus or minus 3 in. above the walking or working level. Other choices use handrail heights, a rigid single number, or an overstatement not in the guardrail rule.
Why the Other Options Are Wrong
Option B: 30 in. plus or minus 3 in.
Choice B gives 30 in. plus or minus 3 in. Its specific error: 30 in. plus or minus 3 in. is the wrong OSHA fall-protection number for the item asked.
Option C: 36 in. exactly
Choice C (36 in. exactly) is rejected because 36 in. exactly is the wrong OSHA fall-protection number for the item asked.
Option D: 48 in. minimum
In general project requirements, 48 in. minimum is the wrong selection for Guardrail height: 48 in. minimum is the wrong OSHA fall-protection number for the item asked.
Memory Technique
Make guardrail height a tabbed card: cite the exact condition, then choose 42 in. plus or minus 3 in.
Reference Hint
Open 29 CFR 1926 OSHA Construction Standards; use 29 CFR 1926.502(b)(1) to confirm that OSHA guardrail top edges are 42 in.
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