Red Seal Plumbing Practice Exam

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A drainage pipe serving a drinking fountain must be:

directly connected to a sanitary drainage system
indirectly connected to a sanitary drainage system
connected without a trap
connected with two traps

The correct answer is: indirectly connected to a sanitary drainage system

A drainage pipe serving a drinking fountain must be indirectly connected to a sanitary drainage system because this allows for potential blockages or contaminants to be prevented from entering the drinking water supply. Option A, directly connected, poses a risk of cross-contamination between the sanitary and drinking water systems. Option C, connected without a trap, would also not provide protection against backflow or contamination. Similarly, option D, connected with two traps, can create a siphon effect which can also lead to contaminants entering the drinking water. Therefore, option B is the best choice as it ensures the safety and cleanliness of the drinking water supply.