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

Cleanouts must be installed at intervals not exceeding 15 m on horizontal drainage runs to allow access for clearing blockages with standard drain-cleaning equipment.

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

The Code requires a water test of at least 3 m head (approximately 30 kPa) held for 15 minutes to verify the integrity of all joints and connections in the DWV system.

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

The Code requires a cleanout at the base of each stack that is the same size as the pipe, up to a maximum of 4 inches, to allow rodding access.

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

The Code requires a minimum clearance of 550 mm in front of a water closet to provide adequate user access and comfort.

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

The Code requires an air gap of at least two pipe diameters or 25 mm, whichever is greater, to prevent cross-connection and backflow contamination.

Red Seal Plumber 306A Practice Test

Red Seal Plumber 306A Practice Test

306A National Plumbing Code of Canada 3