Plumber Red Seal · Question
What is the minimum permissible slope for a 102 mm (4 inch) horizontal drainage pipe carrying sanitary sewage, according to the National Plumbing Code of Canada?
The National Plumbing Code of Canada specifies a minimum slope of 1:50 for horizontal drainage pipes 76 mm (3 inch) in diameter and larger. A slope of 1:25 or 1
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Question: What is the minimum permissible slope for a 102 mm (4 inch) horizontal drainage pipe carrying sanitary sewage, according to the National Plumbing Code of Canada?
Answer options:
- 1:80 ✅ 1:50
- 1:40
- 1:25
Correct answer: 1:50
Explanation: The National Plumbing Code of Canada specifies a minimum slope of 1:50 for horizontal drainage pipes 76 mm (3 inch) in diameter and larger. A slope of 1:25 or 1:40 is often required for smaller pipes or specific conditions, but 1:50 is the general minimum for a 102 mm pipe.
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