306A National Plumbing Code of Canada

Question 1

What is the minimum size of a building drain serving a single water closet according to the National Plumbing Code of Canada?

Accepted Answer

3 inch

Answer

2 inch

Answer

4 inch

Answer

6 inch

Question 2

According to the Code, what is the maximum distance a P-trap can be from the vent connection?

Accepted Answer

1.2 m for 1¼ inch trap

Answer

1.5 m for 1¼ inch trap

Answer

2.0 m for 1¼ inch trap

Answer

3.0 m for 1¼ inch trap

Question 3

What minimum slope is required for a 4-inch horizontal drainage pipe in the National Plumbing Code of Canada?

Accepted Answer

1 in 50 (2%)

Answer

1 in 25 (1%)

Answer

1 in 100 (1%)

Answer

1 in 10 (10%)

Question 4

How many fixture units does a standard bathtub have according to the National Plumbing Code of Canada?

Accepted Answer

2 fixture units

Answer

1 fixture unit

Answer

3 fixture units

Answer

4 fixture units

Question 5

What is the minimum depth of a trap seal required by the National Plumbing Code of Canada?

Accepted Answer

50 mm

Answer

25 mm

Answer

75 mm

Answer

100 mm

Question 6

According to the Code, when is a backwater valve required on a building drain?

Accepted Answer

When fixtures are below the level of the street or the manhole cover

Answer

On all building drains

Answer

Only on commercial buildings

Answer

Only when required by the building owner