What is the minimum edge distance required when installing guardrail posts for fall protection?
Correct Answer
B) 6 inches
OSHA requires guardrail posts to be spaced not more than 8 feet apart and positioned no more than 6 inches from the edge they are protecting.
Why This Is the Correct Answer
OSHA 29 CFR 1926.502(b) governs guardrail systems. Guardrail posts must be positioned no more than 6 inches from the unprotected edge they are guarding. The 6-inch maximum edge distance ensures the top rail extends over the hazardous edge, providing effective fall protection.
Why the Other Options Are Wrong
Option A: 3 inches
3 inches is not an OSHA-specified edge distance for guardrail posts. It may appear as a plausible smaller number, but the standard specifies 6 inches.
Option C: 2 inches
2 inches is too small a distance; while it might seem safer to be closer to the edge, OSHA's specification is 6 inches. Note that 2 feet (not inches) is the spoil pile setback rule for excavations — a common mix-up.
Option D: 12 inches
12 inches (1 foot) would place the guardrail post too far back from the edge, leaving a gap that could allow a worker to fall under or around the rail. OSHA's intent is for the rail to be close enough to the edge to be effective.
Memory Technique
Six inches from the edge = 'Six-inch safety shield.' Picture a guardrail post half a foot (6 inches) from a roof edge — close enough to stop a fall. You can also remember: half a foot from the edge keeps your foot from going over.
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