Cross Connection Practice Exam

When is it permissible to install a bypass around a Reduced Pressure Principle Backflow Assembly?

1. When the assembly is old

2. When the bypass is fitted with an RP

3. When required by local code

4. Never

The correct answer is: When the bypass is fitted with an RP

Installing a bypass around a Reduced Pressure Principle Backflow Assembly is permissible when the bypass itself is equipped with a Reduced Pressure (RP) assembly. This is critical because the RP assembly is designed to protect the drinking water supply from contamination by allowing a controlled flow of water through the bypass while preventing backflow. When a bypass is needed—often for maintenance or in situations where continuous service is required—the RP assembly on the bypass ensures that the same level of protection against backpressure and backsiphonage is maintained as with the main assembly. Without such a safeguard, there would be a risk of contaminants entering the potable water system, making it crucial to have an RP installed on the bypass. Choosing the correct answer underscores the importance of maintaining safety standards in cross connection control and highlights the conditions under which bypass systems can be used effectively.