Arizona Plumbing Practice Exam

Strainer plates on drain inlets should be designed so that no opening exceeds what diameter?

1. 1/4 inch

2. 1/2 inch

3. 3/4 inch

4. 1 inch

The correct answer is: 1/2 inch

Strainer plates on drain inlets are essential for preventing larger debris from entering the drainage system while still allowing water to flow through efficiently. The design standard dictates that no opening in these strainer plates should exceed a diameter of 1/2 inch. This size is critical because it strikes a balance between maintaining adequate water drainage and preventing clogs that can occur if larger items enter the system. A diameter of 1/2 inch is small enough to trap leaves, twigs, and other refuse that might otherwise cause blockages in the plumbing system. Additionally, it minimizes the risk of introducing materials that can accumulate and create significant drainage issues over time. Selecting a strainer plate with larger openings would allow more considerable debris to pass through, increasing the likelihood of clogs and maintenance issues. Therefore, adhering to the 1/2 inch maximum opening size is essential for ensuring effective drainage and reliable operation of the plumbing system.