A construction project requires excavation near a 20-foot deep trench. According to OSHA 29 CFR 1926 Subpart P, what protective system is required?
Correct Answer
B) Shoring or shielding system
OSHA 29 CFR 1926 Subpart P requires protective systems such as shoring, sloping, or shielding for trenches 5 feet or deeper. At 20 feet deep, a robust shoring or shielding system is mandatory to protect workers from cave-ins.
Why This Is the Correct Answer
OSHA 29 CFR 1926 Subpart P mandates protective systems for excavations 5 feet or deeper to prevent cave-ins. At 20 feet deep, this trench far exceeds the threshold requiring protection. Shoring or shielding systems are specifically designed protective measures that provide structural support and worker protection in deep excavations. These engineered systems are essential for trenches of this depth, as sloping alone would be impractical and insufficient for such deep excavations.
Why the Other Options Are Wrong
Option A: Sloping only
Sloping alone is inadequate for a 20-foot deep trench. While sloping is a valid protective system for shallower excavations, trenches this deep require more robust protection. The space requirements for proper sloping at 20 feet would be enormous and often impractical on construction sites.
Option C: Warning signs only
Warning signs alone provide no physical protection against cave-ins. OSHA requires actual protective systems, not just warnings, for excavations 5 feet or deeper. Signs are supplementary safety measures but cannot substitute for engineered protective systems required by regulation.
Option D: No protection required if workers stay 6 feet from edge
OSHA requires protective systems for all excavations 5 feet or deeper, regardless of worker positioning. The 6-foot distance mentioned has no basis in OSHA excavation standards. Workers must be protected by proper shoring, sloping, or shielding systems when working in or around deep trenches.
Memory Technique
Remember 'Five Feet = Protection Complete' - any excavation 5 feet or deeper needs a protective system. For deep trenches like 20 feet, think 'Shore it or Shield it' - these robust systems handle the serious cave-in risks.
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