Question

unless made in entirely stable rock, at what depth is a protective system required for a trench? select the 2 answer options that apply. any depth if the competent person says so 5 feet and greater only at depths greater than 10 feet only at depths greater than 20 feet if you need to review this content, it can be found in the excavation risks module of the excavations topic.

Explanation:

In construction - related safety regulations, for trenches not in entirely stable rock, a protective system is required at 5 feet and greater depth. Also, if a competent person deems it necessary at any depth, a protective system should be in place.

Answer:

A. Any depth if the competent person says so
B. 5 feet and greater