Plumber Red Seal · Question
A plumbing apprentice is installing a new kitchen sink drain. The local plumbing code, based on the National Plumbing Code of Canada, specifies a maximum length for a horizontal trap arm. If the trap arm is connected to a vertical stack, what is the maximum developed length permitted for a 38 mm (1 1/2 inch) trap arm?
According to NPC Table 2.5.7.3. (or similar provincial tables for trap arm lengths), the maximum developed length for a 38 mm (1 1/2 inch) trap arm is 1.0 m. Ex
Start free practice for Plumber Red Seal
177 questions · no signup required · 40 free questions per day
Question: A plumbing apprentice is installing a new kitchen sink drain. The local plumbing code, based on the National Plumbing Code of Canada, specifies a maximum length for a horizontal trap arm. If the trap arm is connected to a vertical stack, what is the maximum developed length permitted for a 38 mm (1 1/2 inch) trap arm?
Answer options: ✅ 1.0 m
- 1.2 m
- 1.5 m
- 2.0 m
Correct answer: 1.0 m
Explanation: According to NPC Table 2.5.7.3. (or similar provincial tables for trap arm lengths), the maximum developed length for a 38 mm (1 1/2 inch) trap arm is 1.0 m. Exceeding this length can compromise the trap's seal due to siphonage or backpressure.
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.