Plumber Red Seal · Question
An apprentice is connecting a dishwasher to the kitchen sink drain. The dishwasher's waste hose is routed through an air gap fitting and then connected to a wye fitting on the sink tailpiece. What is the maximum developed length permitted for the trap arm of the kitchen sink, given its diameter is 38 mm (1 1/2 inches)?
For a 38 mm (1 1/2 inch) trap arm, the National Plumbing Code of Canada permits a maximum developed length of 1.5 metres (5 feet). This length helps prevent sip
Start free practice for Plumber Red Seal
177 questions · no signup required · 40 free questions per day
Question: An apprentice is connecting a dishwasher to the kitchen sink drain. The dishwasher's waste hose is routed through an air gap fitting and then connected to a wye fitting on the sink tailpiece. What is the maximum developed length permitted for the trap arm of the kitchen sink, given its diameter is 38 mm (1 1/2 inches)?
Answer options: ✅ 1.5 metres
- 2.5 metres
- 3.0 metres
- 1.2 metres
Correct answer: 1.5 metres
Explanation: For a 38 mm (1 1/2 inch) trap arm, the National Plumbing Code of Canada permits a maximum developed length of 1.5 metres (5 feet). This length helps prevent siphoning and ensures the trap seal is maintained.
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.