Plumber Red Seal · Question
What is the maximum developed length for a fixture arm for a 1½-inch (38 mm) trap, according to Canadian plumbing codes?
For a 1½-inch (38 mm) trap, the maximum developed length of the fixture arm before it connects to a vent or stack is typically 2.5 metres (8 feet) under the NPC
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Question: What is the maximum developed length for a fixture arm for a 1½-inch (38 mm) trap, according to Canadian plumbing codes?
Answer options:
- 1.5 metres (5 feet) ✅ 2.5 metres (8 feet)
- 3.0 metres (10 feet)
- 5.0 metres (16 feet)
Correct answer: 2.5 metres (8 feet)
Explanation: For a 1½-inch (38 mm) trap, the maximum developed length of the fixture arm before it connects to a vent or stack is typically 2.5 metres (8 feet) under the NPC, to prevent trap seal loss.
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