CSLB Class B General Contractor's License Practice Exam

How deep must a plastic gas line be installed if it is subject to damage?

1. 12 inches

2. 18 inches

3. 24 inches

4. 30 inches

The correct answer is: 18 inches

The answer indicates that a plastic gas line which is subject to damage must be buried a minimum depth of 18 inches. This requirement is in place to protect the gas line from potential physical damage caused by surface loads, equipment, or activities occurring above ground. The depth also serves to provide an appropriate level of safety, accounting for the likelihood of ground movement or other disturbances that might compromise the integrity of the line. In many building codes and safety regulations, the determination of this minimum burial depth ensures that the gas distribution system remains safe for both the public and the environment. By adhering to this requirement, contractors can ensure compliance with regulatory standards and maintain safe operation of gas lines, thereby minimizing the risk of leaks or failures that could lead to accidents. Other options present depths that exceed the minimum requirement but aren't necessary for all scenarios, particularly when damage is likely to occur. Each jurisdiction may have specific regulations, but the widespread standard for protecting gas lines effectively while considering the risk involved supports the accuracy of the 18-inch minimum depth.