Which laboratory is recognized for listing appurtenances used in LP-Gas service?

The correct answer highlights the role of Underwriters Laboratories (UL) in the safety and standardization of appurtenances used in LP-Gas service. UL is a well-respected organization that provides testing, inspection, and certification services for a variety of products, including those used in gas service applications. They establish safety standards and conduct stringent tests to ensure that these appurtenances meet regulatory requirements and function safely in the field.

By recognizing and certifying products through comprehensive testing procedures, UL provides assurance to manufacturers and consumers that these appurtenances are reliable and safe for use in LP-Gas systems. The UL mark on a product indicates that it has met high safety standards, allowing for increased confidence in the equipment's performance and reliability in LP-Gas applications.

Other organizations listed play significant roles in related fields, but they do not specifically focus on listing appurtenances for LP-Gas. For example, the National Fire Protection Association (NFPA) is primarily known for establishing fire safety codes and standards, while the American Gas Association (AGA) focuses on utility interests and standards for natural gas. The International Code Council (ICC) develops building codes, which include aspects of safety and construction, but it does not specialize in the