Plumber Red Seal · Question
What is the minimum required slope for a 3-inch (75 mm) building drain according to the National Plumbing Code of Canada (NPC)?
The National Plumbing Code of Canada specifies a minimum slope of 1 unit in 50 units (1:50) for building drains 3 inches (75 mm) in diameter and larger to ensur
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Question: What is the minimum required slope for a 3-inch (75 mm) building drain according to the National Plumbing Code of Canada (NPC)?
Answer options: ✅ 1 unit in 50 units (1:50)
- 1 unit in 100 units (1:100)
- 1 unit in 25 units (1:25)
- 1 unit in 200 units (1:200)
Correct answer: 1 unit in 50 units (1:50)
Explanation: The National Plumbing Code of Canada specifies a minimum slope of 1 unit in 50 units (1:50) for building drains 3 inches (75 mm) in diameter and larger to ensure adequate self-cleansing velocity. Smaller diameter pipes may require a steeper slope.
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