Cross Connection Practice Exam

What is required to protect the potable water supply when non-toxic antifreeze chemicals are added to a fire suppression system?

1. Air Gap Protection

2. Reduced Pressure Principle Backflow Assembly

3. Double Check Valve Assembly

4. Vacuum Breaker

The correct answer is: Reduced Pressure Principle Backflow Assembly

To ensure the protection of the potable water supply when non-toxic antifreeze chemicals are added to a fire suppression system, the use of a reduced pressure principle backflow assembly is essential. This device is specifically designed to prevent backflow, which can occur if the pressure in the fire suppression system drops below the pressure in the potable water supply. The reduced pressure principle backflow assembly maintains a lower pressure on the supply side of the assembly compared to the system side. This differential ensures that in the event of a backflow condition, any contaminants, including the antifreeze chemicals, cannot flow back into the potable water supply. This becomes critical as it safeguards public health by ensuring that no harmful substances can contaminate the drinking water. In contrast, other choices like air gap protection, double check valve assemblies, and vacuum breakers may not provide the same level of protection in situations involving specific chemical additives. While they serve important functions in certain contexts, the reduced pressure principle backflow assembly is the most effective solution for safeguarding the water supply in scenarios involving the introduction of non-toxic additives, as it directly addresses the risk of backflow in systems where harmful substances could be present.