NFPA 54 is the National Fuel Gas Code used for interior gas piping requirements.

• A. National Fuel Gas Code (NFPA 54)
• B. National Electrical Code (NFPA 70)
• C. Uniform Plumbing Code
• D. National Fire Code

Answer: (A)

The main concept here is that NFPA 54 is the standard for interior fuel gas piping. This code, the National Fuel Gas Code, provides the official requirements for designing, installing, and terminating fuel gas piping systems and the connections to appliances inside buildings. It covers how piping is sized, installed, tested, and protected to ensure safe operation and minimize leaks, spills, or accidental ignition.

Other codes serve different areas: the electrical code (NFPA 70) governs electrical wiring and equipment, not gas piping; the Uniform Plumbing Code focuses on plumbing systems in general and may reference gas piping but does not specialize in interior fuel gas installations like NFPA 54; the National Fire Code (NFPA 1) addresses fire prevention and safety management rather than the detailed interior piping requirements.