Plumber Red Seal · Question
A plumber is installing a new multi-story residential building. The plans indicate a 100 mm soil stack serving multiple floors. According to the National Plumbing Code of Canada, what is the maximum number of fixture units allowed to connect to a 100 mm soil or waste stack exceeding three storeys in height?
For a 100 mm soil or waste stack extending more than three storeys, the National Plumbing Code of Canada specifies a maximum fixture unit load of 500. This ensu
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Question: A plumber is installing a new multi-story residential building. The plans indicate a 100 mm soil stack serving multiple floors. According to the National Plumbing Code of Canada, what is the maximum number of fixture units allowed to connect to a 100 mm soil or waste stack exceeding three storeys in height?
Answer options:
- 240 fixture units
- 360 fixture units ✅ 500 fixture units
- 720 fixture units
Correct answer: 500 fixture units
Explanation: For a 100 mm soil or waste stack extending more than three storeys, the National Plumbing Code of Canada specifies a maximum fixture unit load of 500. This ensures adequate drainage capacity for the stack's height and connected fixtures, preventing overflows and hydraulic issues.
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