306A National Plumbing Code of Canada 2

Question 1

What is the maximum number of fixture units that can be connected to a 2-inch horizontal branch according to the Code?

Accepted Answer

6

Answer

The Code allows a maximum of 6 fixture units on a 2-inch horizontal branch to prevent overloading and ensure proper drainage.

Question 2

According to the National Plumbing Code of Canada, what type of fitting must be used to change direction in a horizontal drainage pipe?

Accepted Answer

Long-sweep fitting or combination wye

Answer

Long-sweep fittings or combination wye fittings are required for direction changes in horizontal drainage to maintain flow velocity and reduce the risk of blockage.

Question 3

What is the minimum size of a vent stack serving a building with more than 10 fixture units?

Accepted Answer

2 inch

Answer

A vent stack serving more than 10 fixture units must be at least 2 inches in diameter to provide adequate air circulation for the drainage system.

Question 4

How far above the flood level rim of the highest fixture must a vent terminate according to the Code?

Accepted Answer

150 mm

Answer

The vent must terminate at least 150 mm above the flood level rim of the highest served fixture to prevent waste water from entering the vent system during backup conditions.

Question 5

Under what conditions does the Code permit the use of an air admittance valve (AAV)?

Accepted Answer

Only when approved by the local authority having jurisdiction

Answer

The National Plumbing Code of Canada permits air admittance valves only when approved by the authority having jurisdiction, as they are considered an alternative venting method.

Red Seal Plumber 306A Practice Test

Red Seal Plumber 306A Practice Test

306A National Plumbing Code of Canada 2