Ignite Success: Ace the 2026 MCC-NH Gas Fitters Exam!

The requirement for gas piping installed underground beneath buildings is that it must be placed in an approved conduit. This directive primarily aims to ensure safety and protect the integrity of the gas piping from potential damage and environmental factors. An approved conduit serves as a protective barrier, which helps prevent corrosion, physical damage, and contamination that could occur from soil conditions or other underground hazards.

Utilizing an approved conduit also simplifies the process of inspecting and maintaining gas piping systems, as any necessary repairs can be conducted more efficiently without requiring excavation of the surrounding soil. This safety feature is crucial, as it minimizes the risk of leaks, which could lead to hazardous situations.

The other options presented do not meet the standards established for safety and compliance in underground gas piping installations. Leaving the piping unencased could expose it to external damages and environmental factors, and installing without inspections undermines the safety protocols designed to protect both property and human life. Additionally, limiting the piping to only steel is not accurate, as various materials can be used, provided they comply with the relevant codes and standards.