Arizona Plumbing Practice Exam 2026 – All-in-One Guide to Master Your Plumbing Certification!

Gas piping can be installed underground beneath a building if it is placed in a conduit. The use of conduit provides a protective barrier around the gas piping, helping to prevent damage and corrosion from surrounding soil and external factors. This is particularly important because gas lines must maintain structural integrity and prevent leaks, which could lead to dangerous situations.

While insulation, leak testing, and reinforcement with steel are important considerations in gas piping installation, they are not the specific criteria for underground installation beneath a building. Insulation, for example, typically addresses temperature control rather than the protection required specifically for underground conditions. Leak testing is essential for ensuring the safety and integrity of gas lines but does not pertain to whether the piping can be placed underground. Similarly, reinforcement with steel may add strength but does not fulfill the requirement for safe installation beneath a building.