At what depth does OSHA generally require cave-in protection for excavations unless the excavation is entirely in stable rock?
Correct Answer
B) 5 ft or deeper
OSHA generally requires protective systems at 5 ft or deeper unless the excavation is entirely in stable rock; shallower excavations may also need protection if hazards exist.
Why This Is the Correct Answer
OSHA generally requires protective systems at 5 ft or deeper unless the excavation is entirely in stable rock; shallower excavations may also need protection if hazards exist.
Why the Other Options Are Wrong
Option A: 2 ft or deeper
The trap in A is 2 ft or deeper. That selection is wrong because 2 ft or deeper uses the wrong excavation protective-system trigger or exception.
Option C: 10 ft or deeper only
Choice C (10 ft or deeper only) is rejected because 10 ft or deeper only uses the wrong excavation protective-system trigger or exception.
Option D: Only below the water table
In site construction, Only below the water table is the wrong selection for Excavation protective system trigger: it tries to bypass the Excavation protective system trigger checkpoint.
Memory Technique
Treat excavation protective system trigger like a labeled shelf; only the matching condition belongs with 5 ft or deeper.
Reference Hint
Open OSHA 29 CFR 1926 Subpart P; EPA Construction General Permit concepts where applicable; use OSHA 1926.652(a) to confirm that OSHA generally requires protective systems at 5 ft or deeper unless the excavation is entirely in stable rock; shallower excavations may also need protection if hazards exist.
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