NM CID GF-4 Practice Questions - New Mexico CID GF-4 Drainage Or Flood Control Systems Contractor Examination Exam

Under OSHA 29 CFR 1926.652, a protective system is required for a trench that is 5 feet deep or greater unless:

The excavation is made entirely in stable rock The trench will be open for less than one hour Only one employee will enter at a time The contractor has a written confined-space permit

Correct Answer:

The excavation is made entirely in stable rock

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