Practice question

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

  1. The crew is only in the trench for 10 minutes
  2. The excavation is made entirely in stable rock
  3. The contractor has a trench box on another project
  4. The soil looks dry from the surface

Answer: B — The excavation is made entirely in stable rock

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