Plumber Red Seal · Question
Under the NPC, a building (house) trap is generally prohibited. What is a specific exception where one might be required?
A building trap, along with fresh air inlets, is sometimes required by local authorities when a building's sanitary drain connects to a combined public sewer to
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Question: Under the NPC, a building (house) trap is generally prohibited. What is a specific exception where one might be required?
Answer options:
- In all homes located in a floodplain. ✅ When the building sewer connects to a combined storm and sanitary sewer.
- For any building more than three storeys high.
- If the plumbing system uses a private septic system.
Correct answer: When the building sewer connects to a combined storm and sanitary sewer.
Explanation: A building trap, along with fresh air inlets, is sometimes required by local authorities when a building's sanitary drain connects to a combined public sewer to prevent sewer gases from the larger main from entering the building's drainage system.
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