Where can plastic pipe for gas be used?

• A. Underground outside
• B. Inside building
• C. Inside cabinets
• D. In roof spaces

Answer: (A)

Plastic piping for gas is intended for buried outdoor service lines. It’s designed to be protected from sunlight, moisture, and physical damage when buried outside the building, and the joints are fusion-wused to keep a gas-tight seal. For interior installations, cabinets, or attic/roof spaces, plastic pipe is not used because those locations expose piping to heat, physical abuse, and other conditions that can lead to leaks or damage, and interior gas piping typically uses metal piping or approved interior-rated nonmetallic piping (such as CSST with proper installation). So the only appropriate use described here is the underground exterior gas service.