306A National Plumbing Code of Canada 3

Question 1

According to the Code, what is the maximum interval between cleanout access points on a horizontal drainage pipe?

Accepted Answer

15 m

Answer

5 m

Answer

10 m

Answer

20 m

Question 2

What test pressure is required for a DWV system rough-in test using water according to the Code?

Accepted Answer

A column of water at least 3 m high or 30 kPa

Answer

A column of water at least 1.5 m high

Answer

A column of water at least 5 m high

Answer

50 kPa air pressure

Question 3

What does the Code require for a cleanout at the base of every soil or waste stack?

Accepted Answer

A cleanout the same size as the stack, up to 4 inches

Answer

Cleanout is optional at the base of stacks

Answer

A 2-inch cleanout regardless of stack size

Answer

A cleanout only if the stack is over 3 inches

Question 4

According to the National Plumbing Code of Canada, what is the minimum clearance in front of a water closet?

Accepted Answer

550 mm

Answer

300 mm

Answer

400 mm

Answer

450 mm

Question 5

What minimum air gap is required between a faucet outlet and the flood level rim of a fixture?

Accepted Answer

Two pipe diameters or 25 mm, whichever is greater

Answer

One pipe diameter

Answer

50 mm

Answer

Three pipe diameters

Question 6

What type of backflow preventer does the Code require for a high-hazard cross-connection?

Accepted Answer

Reduced pressure principle (RP) assembly

Answer

Dual check valve

Answer

Atmospheric vacuum breaker

Answer

Hose bib vacuum breaker