306A National Plumbing Code of Canada 4

Question 1

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

Accepted Answer

Corrugated steel

Answer

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.

Question 2

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

Accepted Answer

1¼ inch

Answer

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.

Question 3

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

Accepted Answer

A cleanout must be provided at the change of direction

Answer

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.

Question 4

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

Accepted Answer

300 mm minimum, but varies with snow load zone

Answer

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.

Question 5

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

Accepted Answer

2 fixture units

Answer

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

Red Seal Plumber 306A Practice Test

Red Seal Plumber 306A Practice Test

306A National Plumbing Code of Canada 4