When the reviewer opens the backup package, what top-edge height is used for OSHA construction guardrails?
Correct Answer
A) 42 in. plus or minus 3 in.
42 in. plus or minus 3 in. is the controlling requirement.502(b)(1). Other choices: the distractors are related-looking contract or field terms, but they do not match the cited requirement for review item 118.
Why This Is the Correct Answer
42 in. plus or minus 3 in. is the controlling requirement.502(b)(1).
Why the Other Options Are Wrong
Option B: 30 in. to 37 in.
The trap in B is 30 in. to 37 in. That selection is wrong because 30 in. to 37 in. is the wrong OSHA fall-protection number for the item asked.
Option C: 36 in. exactly
Choice C gives 36 in. exactly. Its specific error: 36 in. exactly is the wrong OSHA fall-protection number for the item asked.
Option D: 48 in. minimum
Choice D (48 in. minimum) is rejected because 48 in. minimum is the wrong OSHA fall-protection number for the item asked.
Memory Technique
Make guardrail top edge 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 42 in.
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