Plumber Red Seal · Question
A pressure-reducing valve (PRV) is mandated by the NPC for a potable water system when the static water pressure from the supply main exceeds what threshold?
The National Plumbing Code specifies that a pressure-reducing valve must be installed if the static pressure in the water distribution system exceeds 550 kPa (8
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Question: A pressure-reducing valve (PRV) is mandated by the NPC for a potable water system when the static water pressure from the supply main exceeds what threshold?
Answer options:
- 350 kPa (50 psi)
- 415 kPa (60 psi) ✅ 550 kPa (80 psi)
- 690 kPa (100 psi)
Correct answer: 550 kPa (80 psi)
Explanation: The National Plumbing Code specifies that a pressure-reducing valve must be installed if the static pressure in the water distribution system exceeds 550 kPa (80 psi) to protect fixtures, appliances, and piping from damage caused by excessive pressure.
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