Which of the following materials does the code specifically address in requirements?

• A. Wood composites
• B. PVC piping
• C. Metal and non-metal appliances
• D. Electrical wiring

Answer: (C)

The code specifically addresses metal and non-metal appliances due to the necessity of ensuring that these appliances comply with safety and performance standards when used in gas systems. Regulations concerning appliances cover a range of requirements including installation, maintenance, and operational practices that can vary based on the material composition and functionality of the appliance.

Metal appliances, for instance, are often addressed in the context of their ability to withstand high temperatures and pressures associated with gas usage. Non-metal appliances may be addressed in terms of their compatibility with gas and adherence to safety standards to prevent hazards like leaks or failures. Overall, the emphasis on both categories in the code suggests a thorough need for compliance regarding how these devices are constructed, installed, and maintained, along with how they interact with gas services. This ensures a higher level of safety and functionality in the overall gas infrastructure.

While materials like wood composites, PVC piping, and electrical wiring have their own sets of regulations, they do not receive the same direct focus within the gas code itself as the specified appliances do. Thus, choosing metal and non-metal appliances reflects the critical considerations for gas safety that the code aims to address.