SafetyQuestion 445 of 521
An excavation or trench that is how deep generally requires a protective system (sloping, shoring, or shielding) unless it is entirely in stable rock?
a.5 feet or deeper
b.10 feet or deeper
c.2 feet or deeper
d.20 feet or deeper
Explanation
Trenches 5 feet deep or more must have a protective system (sloping/benching, shoring, or a trench shield) unless made entirely in stable rock. The 2-foot answer is too shallow, and waiting until 10 or 20 feet would leave workers unprotected in the depth range where fatal cave-ins commonly occur.
Law Reference: Cal/OSHA Title 8 §1541.1Practice all 521 questions free — no signup required.
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