When gas pipe is installed underground for an industrial building, it is encased in approved conduit.

• A. Encased in approved conduit
• B. Buried directly
• C. Wrapped in insulation only
• D. Painted

Answer: (A)

When gas pipe is placed underground, it must be protected by an approved conduit to guard against physical damage, moisture, and soil conditions that can corrode or crush the pipe. The conduit provides mechanical protection and a defined pathway that makes future replacement or inspection easier, without the pipe being in direct contact with soil or heavy loads. Wrapping in insulation alone does not shield the pipe from impact or soil conditions, and painting offers no protection for a buried installation. Using an approved conduit meets code requirements and helps ensure the underground gas system remains safe and serviceable.