Plumber Red Seal · Question
A plumber is installing a new drainage system for a residential bathroom. The system includes a sink, a toilet, and a bathtub. According to the National Plumbing Code of Canada, what is the minimum required slope for a 76 mm (3 inch) horizontal building sewer?
The National Plumbing Code of Canada specifies a minimum slope of 1:50 (2%) for a building sewer up to 102 mm (4 inches) in diameter. This ensures adequate flow
Start free practice for Plumber Red Seal
177 questions · no signup required · 40 free questions per day
Question: A plumber is installing a new drainage system for a residential bathroom. The system includes a sink, a toilet, and a bathtub. According to the National Plumbing Code of Canada, what is the minimum required slope for a 76 mm (3 inch) horizontal building sewer?
Answer options: ✅ 1:50 (2%)
- 1:100 (1%)
- 1:25 (4%)
- 1:200 (0.5%)
Correct answer: 1:50 (2%)
Explanation: The National Plumbing Code of Canada specifies a minimum slope of 1:50 (2%) for a building sewer up to 102 mm (4 inches) in diameter. This ensures adequate flow velocity to prevent solids from settling in the pipe.
Start free practice for Plumber Red Seal
177 questions · no signup required · 40 free questions per day
More about Plumber Red Seal
Related Questions
- Before starting a new plumbing installation in a residential basement, what is the primary reason why a plumbe
- A plumber is installing a new kitchen sink in an existing residential dwelling. The sink drain is connected to
- A plumber is installing drainage for a dishwasher in a residential kitchen. The dishwasher P-trap is located 1
- A plumber is asked to install a backflow prevention assembly on a lawn irrigation system connected to the pota
- A plumber is considering the velocity of water in a 50 mm (2") copper pipe supplying a commercial building. Ex
- A plumber is designing the domestic hot water recirculation system for a multi-story residential building. Wha
More for Plumber Red Seal candidates
Practice tests
Question explanations
- Before starting a new plumbing installation in a residential basement, what is the primary reason why a plumbe
- A plumber is installing a new kitchen sink in an existing residential dwelling. The sink drain is connected to
- A plumber is installing drainage for a dishwasher in a residential kitchen. The dishwasher P-trap is located 1
- A plumber is asked to install a backflow prevention assembly on a lawn irrigation system connected to the pota
Ready to practice?
Free, no signup required. Build a wrong-question list as you go.
Start Free Plumber Red Seal Practice →Related courses
Other Canadian certifications candidates often prepare for alongside this one.