Which codes regulate a building gas distribution system?

The correct answer encompasses codes that directly pertain to the regulation of gas distribution systems within buildings. NFPA 54, known as the National Fuel Gas Code, provides essential requirements for the installation and maintenance of fuel gas piping systems. NFPA 58 is the Liquefied Petroleum Gas Code, which sets standards for the safe distribution and storage of liquefied petroleum gases. CSA B149.1 is a Canadian standard that outlines the installation code for natural gas and propane. Together, these codes ensure that gas distribution systems are designed and maintained to prevent leaks, ensure safety, and comply with national and local regulations.

Other options contain standards that are either unrelated or pertain to different aspects of construction and engineering. For example, the ISO standards listed focus on management systems rather than specific gas distribution installations, while ASTM and ANSI standards in another option address testing and equipment rather than the overall distribution systems needed for building gas supply. Similarly, the codes listed in the last option focus on materials and electrical installations, which are not specific to the regulations governing building gas distribution systems.