Plumber Red Seal · Question
A plumber is installing drainage for a dishwasher and a kitchen sink in a residential dwelling. The kitchen sink has a double basin. According to the National Plumbing Code of Canada, what minimum trap arm size is required to serve these fixtures if they are connected to a single trap?
The National Plumbing Code of Canada (NPC) dictates that a kitchen sink with a double basin and a dishwasher typically requires a minimum 51 mm (2 inch) trap ar
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Question: A plumber is installing drainage for a dishwasher and a kitchen sink in a residential dwelling. The kitchen sink has a double basin. According to the National Plumbing Code of Canada, what minimum trap arm size is required to serve these fixtures if they are connected to a single trap?
Answer options:
- 38 mm (1 1/2 inch) ✅ 51 mm (2 inch)
- 64 mm (2 1/2 inch)
- 76 mm (3 inch)
Correct answer: 51 mm (2 inch)
Explanation: The National Plumbing Code of Canada (NPC) dictates that a kitchen sink with a double basin and a dishwasher typically requires a minimum 51 mm (2 inch) trap arm. A 38 mm (1 1/2 inch) trap arm is insufficient for the combined drainage load of these fixtures.
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