306A National Plumbing Code of Canada 6

Question 1

What does the Code define as a 'wet vent'?

Accepted Answer

A vent that also serves as a drain for one or more fixtures

Answer

A wet vent is defined as a vent pipe that also serves as a drain for one or more fixtures. It must be sized to handle both the drainage and venting functions.

Question 2

According to the Code, what size must a wet vent be if it serves a water closet?

Accepted Answer

3 inch

Answer

A wet vent serving a water closet must be at least 3 inches in diameter to handle the combined drainage and venting load without restricting either function.

Question 3

What is the Code requirement for the grade of underground drainage piping?

Accepted Answer

Minimum 1 in 50 for pipe 3 inches and smaller

Answer

Underground drainage pipe 3 inches and smaller requires a minimum grade of 1 in 50. Pipes 4 inches and larger may use a minimum grade of 1 in 100.

Question 4

According to the Code, what is the minimum size of a relief vent?

Accepted Answer

Half the diameter of the pipe it serves

Answer

A relief vent must be at least half the diameter of the pipe it serves, ensuring it can equalize pressure effectively in the drainage system.

Question 5

What does the Code require for piping that passes through a concrete floor slab?

Accepted Answer

A sleeve or casing must be provided to allow pipe movement

Answer

The Code requires a sleeve or casing around piping passing through concrete slabs to allow for differential movement and to protect the pipe from damage during concrete curing and structural settlement.

Red Seal Plumber 306A Practice Test

Red Seal Plumber 306A Practice Test

306A National Plumbing Code of Canada 6