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NV A-15 Sewers And Drains Practice Questions - Nevada A-15 Sewers, Drains And Pipes Contractor Examination Exam

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Per 29 CFR 1926.652, employees in an excavation generally must be protected by a sloping, shoring, or shielding system once the excavation is how deep, unless it is entirely in stable rock?
Correct Answer:
5 feet

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