What is the main focus of Section 4 in the National Plumbing Code?

The main focus of Section 4 in the National Plumbing Code is on design criteria for plumbing systems. This section outlines the necessary standards and principles that guide the proper design of plumbing systems to ensure safety, efficiency, and functionality. It addresses various aspects such as sizing pipes, selecting appropriate fixtures, and ensuring that systems can safely accommodate the intended flow and pressure of water.

Understanding design criteria is crucial for ensuring that plumbing installations are safe and effective in terms of performance. This includes considerations like drainage, venting, and water supply, which are all integral to a well-functioning plumbing system.

The other topics mentioned, such as materials standards, maintenance and repair protocols, and water conservation measures, are indeed important but serve different purposes within the overall framework of plumbing codes and practices. Each of these areas is covered in other sections of the code, ensuring a comprehensive approach to plumbing that addresses every aspect from design through to maintenance.