Heavy equipment is operating near an excavation with workers below. What is the minimum safe distance the equipment should maintain from the excavation edge?
Correct Answer
D) Equal to the depth of the excavation
OSHA requires that heavy equipment operating near excavations maintain a distance from the edge equal to the depth of the excavation, or have the excavation properly sloped or shored. This prevents soil collapse from equipment loads.
Why This Is the Correct Answer
OSHA 29 CFR 1926.651(j)(2) specifically requires that mobile equipment operating near excavations maintain a distance from the edge equal to the depth of the excavation. This rule is based on the angle of repose and the potential for soil failure under dynamic loads from heavy equipment. The deeper the excavation, the greater the potential failure zone, which is why the setback distance must increase proportionally with depth. This regulation ensures that the vibration and weight of equipment doesn't cause cave-ins that could injure workers below.
Why the Other Options Are Wrong
Option A: 2 feet
A fixed 2-foot distance is inadequate for deeper excavations, as it doesn't account for the increased failure zone that occurs with greater depths and would violate OSHA requirements for excavations deeper than 2 feet.
Option B: 4 feet
A fixed 4-foot distance fails to provide adequate protection for excavations deeper than 4 feet and doesn't comply with OSHA's depth-based setback requirements.
Option C: 6 feet
A fixed 6-foot distance is insufficient for excavations deeper than 6 feet and doesn't follow OSHA's requirement that setback distance must equal the excavation depth.
Memory Technique
Use the mnemonic 'D=D' (Depth equals Distance) or visualize a right triangle where the excavation depth creates an equal horizontal danger zone at ground level.
Reference Hint
OSHA Construction Standards 29 CFR 1926.651 - Specific Excavation Requirements, subsection (j)(2) regarding mobile equipment
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