Gas piping and gas tubing that connect the outlet of a meter to appliances are regulated by which standard?

The correct standard for regulating gas piping and gas tubing that connect the outlet of a meter to appliances is NFPA-54-2012. This code, known as the National Fuel Gas Code, outlines the requirements for the safe installation and operation of gas piping systems. It includes specifications for the design, materials, and installation practices that ensure the safe and efficient utilization of gas for heating and cooking appliances.

NFPA-54-2012 is particularly focused on gas supply systems and covers important aspects such as the sizing of gas lines, venting requirements, and various safety protocols that must be followed in residential and commercial applications. By adhering to this standard, plumbers and contractors can minimize risks associated with gas leaks, explosions, and other hazards.

The other options relate to broader or different aspects of plumbing and gas installation, thereby making them less relevant in the context of gas piping directly connected to appliances. For example, NCC (National Construction Code) typically addresses a wider set of building regulations, ANSI Z21.75 focuses on gas appliance connectors, and UPC (Uniform Plumbing Code) primarily deals with plumbing systems in general without the specific focus on gas piping.