On new construction a drain is required to be located no more than _______ feet from a RPZ assembly.

The correct answer indicates that on new construction, a drain must be located no more than 5 feet from a Reduced Pressure Zone (RPZ) assembly. This requirement is rooted in the need to maintain proper drainage and function of the plumbing system while also ensuring backflow prevention mechanisms operate effectively.

The proximity of a drain to an RPZ assembly is crucial for several reasons. First, it facilitates the efficient removal of any potential overflow or leakage from the RPZ, which is designed to prevent contaminated water from flowing back into the potable water supply. By requiring the drain to be within 5 feet, it helps ensure that any potential issues can be dealt with swiftly, reducing the risk of contamination.

Moreover, this regulation is part of broader plumbing code guidelines that focus on safety and health standards in water distribution systems. Adequate drainage near RPZ assemblies is important for preventing water pooling and subsequent issues that could arise from stagnant water, such as pests or further plumbing complications.

In summary, this standard is established to ensure a functional, safe, and compliant plumbing installation that protects public health and maintains water quality.