# Standard Interpretations
1 - 1926.652(b) - Can a person who qualifies as a "competent" person under one section of support P also qualify as a competent designer of structural ramps under 1926.651(c)(1)(i)?.
2 - 1926.652(b) - Protective system requirements for excavations that will not be entered by employees.
3 - 1926.652(b) - Permissibility of using average excavation depth to determine protective system requirements for the excavation.
4 - 1926.652(b) - Registered professional engineer approval requirements for combination trench shield and sloping system trenches with a depth greater than 20 feet.
5 - 1926.652(b) - Registered professional engineer approval requirements for manufactured trench protection systems deeper than 20 feet.
6 - 1926.652(b) - Requirements to prevent trench collapse during sheet-pile operations.
7 - 1926.652(b) - Trench shield must extend 18" above excavation walls when below grade.