Gas piping embedded in concrete and exposed to moisture must be which of the following?

• A. must be wrapped
• B. must be accessible
• C. must be protected in an approved manner
• D. must be PVC

Answer: (C)

Gas piping in damp or moisture-prone locations must be protected in an approved manner. When a pipe runs through concrete or is exposed to moisture, corrosion and deterioration become real safety concerns, so the installation needs protective measures that are specified and approved by the authority having jurisdiction. This means using coatings, barriers, or materials and methods that are recognized as suitable for moisture exposure, rather than relying on simple wrapping or assuming PVC can be used for this purpose. The key idea is that the protection must meet approved standards to maintain the pipe’s integrity and prevent leaks.