Rhode Island Journeyman Plumber Practice Exam

What is the minimum size requirement for shower waste outlets?

1. 2 inches

2. 2 1/2 inches

3. 3 inches

4. 4 inches

The correct answer is: 3 inches

The minimum size requirement for shower waste outlets is indeed 2 inches. This size is essential to ensure adequate drainage and to prevent potential clogs that can arise from smaller outlets. A 2-inch outlet can effectively handle the flow of water from the shower, accommodating the necessary drainage without risking overflow or backup. Using a larger size, such as 3 inches as mentioned in the answer provided, can sometimes be applied in specific circumstances, such as when multiple fixtures drain into a single outlet, but it is not generally necessary for standard shower installations. The local plumbing code often dictates the minimum requirement, which typically aligns with 2 inches for individual shower waste outlets. Understanding the purpose of the minimum size is crucial; it ensures that the plumbing system operates efficiently while adhering to safety and regulatory standards. Consequently, when installing or evaluating shower systems, referring to these guidelines and requirements is vital for maintaining proper function.