Struck-by and Caught-in/Between Hazards Flashcards

Under OSHA 1926.651(j)(2), excavated spoil must be kept at least what distance from the edge of an excavation?

Answer: 2 feet

Spoil and equipment must be kept at least 2 feet from the edge, or held back by retaining devices, so they cannot fall or roll into the excavation.

At what minimum trench depth must a stairway, ladder, ramp, or other safe means of egress be within 25 feet of lateral travel?

Answer: 4 feet

1926.651(c)(2) requires a safe means of egress in trench excavations 4 feet or deeper, no more than 25 feet of lateral travel from workers.

An excavation is planned to a depth of 22 feet. Who must design its protective system?

Answer: A registered professional engineer

Protective systems for excavations deeper than 20 feet must be designed by a registered professional engineer.

What is the maximum allowable slope for a simple sloped excavation under 20 feet deep in Type C soil?

Answer: 1½H:1V (34°)

Appendix B to Subpart P limits Type C soil to a 1½:1 slope, about 34 degrees from horizontal.

Which protective method is NOT permitted in Type C soil?

Answer: Benching

Subpart P Appendix B allows benching only in cohesive Type A and B soils, not in Type C.

When using a trench box, how far may earth be excavated below the bottom of the shield?

Answer: Up to 2 feet, if the shield is rated for the full trench depth

1926.652(g)(2) permits digging up to 2 feet below the shield bottom only if the shield is designed for the full depth and there is no sign of soil loss behind or below it.

Mobile equipment is working next to an excavation, and the operator cannot clearly see the edge. What does OSHA require?

Answer: A warning system such as barricades, hand or mechanical signals, or stop logs

1926.651(f) requires a warning system when the operator does not have a clear and direct view of the excavation edge.