Plumber Red Seal · Question
A plumber is installing a new drainage system for a residential building. According to the National Plumbing Code of Canada (NPC), what is the minimum required slope for a 75 mm horizontal drainage pipe?
The National Plumbing Code of Canada specifies a minimum slope of 1 in 50 for horizontal drainage pipes 75 mm in diameter or less. A shallower slope like 1 in 1
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Question: A plumber is installing a new drainage system for a residential building. According to the National Plumbing Code of Canada (NPC), what is the minimum required slope for a 75 mm horizontal drainage pipe?
Answer options:
- 1 in 100 ✅ 1 in 50
- 1 in 25
- 1 in 15
Correct answer: 1 in 50
Explanation: The National Plumbing Code of Canada specifies a minimum slope of 1 in 50 for horizontal drainage pipes 75 mm in diameter or less. A shallower slope like 1 in 100 would not provide sufficient velocity to scour the pipe, leading to potential blockages.
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