Plumber Red Seal · Question
A plumber is sizing the cold water supply for a small commercial building. The total fixture unit count for the building, using the National Plumbing Code of Canada (NPC) tables, is 75 fixture units. What is the minimum required design flow rate in litres per second (L/s) for this building's main cold water supply, assuming no extraordinary demands?
According to NPC tables for fixture unit to flow rate conversion for commercial establishments, 75 fixture units typically corresponds to a minimum design flow
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Question: A plumber is sizing the cold water supply for a small commercial building. The total fixture unit count for the building, using the National Plumbing Code of Canada (NPC) tables, is 75 fixture units. What is the minimum required design flow rate in litres per second (L/s) for this building's main cold water supply, assuming no extraordinary demands?
Answer options:
- 1.5 L/s
- 2.0 L/s
- 2.5 L/s ✅ 3.0 L/s
Correct answer: 3.0 L/s
Explanation: According to NPC tables for fixture unit to flow rate conversion for commercial establishments, 75 fixture units typically corresponds to a minimum design flow rate of approximately 3.0 L/s. Plumbers use these tables to ensure adequate water supply capacity.
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