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On a construction site, at what trench depth is a cave-in protective system generally required?

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  1. 3 feet
  2. 4 feet
  3. 5 feet

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References

  1. 29 CFR 1926.652 Excavations protective systems (eCFR) www.ecfr.gov/current/title-29/section-1926.652 Checked 2026-10-11.
  2. OSHA Trenching and Excavation Fact Sheet www.osha.gov/sites/default/files/publications/trench_excavation_fs.pdf Checked 2026-10-11.

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