Master Plumber Practice Exam

All trenches deeper than the footing of any building or structure and paralleling the same must be at least what?

1. A 2 feet deep

2. B 45 degrees therefrom

3. C 4 feet thereon

4. D 2 feet wide

The correct answer is: B 45 degrees therefrom

The correct answer is that all trenches deeper than the footing of any building or structure and paralleling the same must maintain an angle of 45 degrees from the edge of the footing. This requirement is based on ensuring proper soil stability and reducing the risk of collapse or shifting, which can compromise the structural integrity of the building. When trenches are dug alongside a building’s footing, they create potential instability, particularly if the trench is deeper than the footing. By mandating a 45-degree angle, this approach helps to provide adequate support to the soil that remains adjacent to the structure, minimizing the likelihood of a cave-in and protecting both the trench workers and the nearby foundation. The other options do not address the critical need for soil stability in this context. A depth of 2 feet, for instance, does not relate specifically to the stability needs surrounding the structure's footing. Similarly, a width of 2 feet does not consider the angle necessary to prevent erosion or collapse. Lastly, stating 4 feet doesn’t align with the measurements pertinent to the safe excavation of trenches when considering structural integrity. Understanding the geological implications of trench depth and angle is essential for maintaining safety standards in plumbing and construction.