# | Regulations |
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1 | - - Requirements for protective systems. |
# | Standard Interpretations |
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1 | - 1926.652(a) - Registered professional engineer approval requirements for combination trench shield and sloping system trenches with a depth greater than 20 feet. |
2 | - 1926.652(a) - Minimum length that an excavation must be before a protective system is required. |