National Plumbing Code of Canada Flashcards

According to the Code, which material is NOT approved for use as a building sewer pipe?

Answer: Corrugated steel

Corrugated steel is not an approved material for building sewers under the National Plumbing Code of Canada. Approved materials include ABS, PVC, cast iron, and vitrified clay.

What is the minimum vent pipe size permitted by the Code?

Answer: 1¼ inch

The National Plumbing Code of Canada specifies a minimum vent pipe size of 1¼ inch (32 mm) to ensure adequate air flow for trap seal protection.

What does the Code require when a horizontal drain pipe changes direction by more than 45 degrees?

Answer: A cleanout must be provided at the change of direction

The Code requires a cleanout at any point where a horizontal drainage pipe changes direction by more than 45 degrees to allow maintenance access at potential blockage points.

According to the Code, how high above the roof must a vent pipe extend when penetrating a roof?

Answer: 300 mm minimum, but varies with snow load zone

Vent pipes must extend at least 150 mm above the roof but in areas subject to snow loads, they must extend higher to remain clear of snow accumulation. Typical requirements range from 300 mm to 600 mm depending on local conditions.

What is the fixture unit value assigned to a domestic kitchen sink by the Code?

Answer: 2 fixture units

A domestic kitchen sink is assigned 2 fixture units in the National Plumbing Code of Canada, reflecting its typical flow rate and drainage demand.

According to the Code, what is the maximum fixture unit load on a 3-inch building drain at a slope of 1 in 50?

Answer: 27 fixture units

A 3-inch building drain at a 1 in 50 slope is rated for a maximum of 27 fixture units according to the drainage sizing tables in the Code.