plumbing code book

Question 1

What is the purpose of an Air Admittance Valve (AAV) in a plumbing system?

Options:
A. To release sewage gases into the atmosphere
B. To allow water to flow into the drainage system
C. To allow air to enter the drainage system when the pressure is less than atmospheric pressure
D. To prevent water backflow into the plumbing system

Answer 1

C. To allow air to enter the drainage system when the pressure is less than atmospheric pressure

Question 2

What is an Auxiliary Water Supply in a plumbing system?
A. A backup system for heating water
B. Any water supply other than the primary potable water supply available on the premises
C. A secondary system for draining wastewater
D. A system for storing rainwater exclusively

Answer 2

B. Any water supply other than the primary potable water supply available on the premises

Question 3

What is a Combined Building Drain?

Options:
A. A drain that separates sewage and stormwater into different pipes
B. A building drain that only conducts sewage
C. A building drain that is intended to conduct both sewage and stormwater
D. A drain system used exclusively for stormwater collection

Answer 3

C. A building drain that is intended to conduct both sewage and stormwater

Question 4

What does Developed Length refer to in a plumbing system?

Options:
A. The straight-line distance between two points in a pipe
B. The length of the pipe excluding fittings
C. The length along the centerline of the pipe and fittings
D. The length of the pipe multiplied by its diameter

Answer 4

C. The length along the centerline of the pipe and fittings

Question 5

What does Nominally Horizontal mean in plumbing terminology?

Options:
A. Exactly parallel to the horizontal
B. At an angle of less than 30° with the horizontal
C. At an angle of less than 45° with the horizontal
D. At an angle greater than 45° with the horizontal

Answer 5

C. At an angle of less than 45° with the horizontal

Question 6

What does Nominally Vertical mean in plumbing terminology?

Options:
A. At an angle of exactly 90° with the vertical
B. At an angle of not more than 30° with the vertical
C. At an angle of not more than 45° with the vertical
D. At an angle greater than 45° with the vertical

Answer 6

D. At an angle greater than 45° with the vertical

Question 7

What are the marking requirements for every length of pipe and fitting according to plumbing standards?

Options:
A. Must have the manufacturer’s name or mark only
B. Must include either the maker’s name or mark, weight/class/quality of the product, or comply with the relevant standard
C. Markings are optional if the pipe is concealed during installation
D. Only fittings require markings, not the pipe

Answer 7

B. Must include either the maker’s name or mark, weight/class/quality of the product, or comply with the relevant standard (2213)

Question 8

What is the minimum pressure requirement for piping, fittings, and joints used in pressure sewer, forcemain, or sump pump discharge applications?

Options:
A. They must withstand the maximum potential pressure.
B. They must withstand twice the maximum potential pressure.
C. They must withstand at least one and one-half times the maximum potential pressure.
D. They must withstand a constant pressure of 150 psi.

Answer 8

C. They must withstand at least one and one-half times the maximum potential pressure. (2214)

Question 9

What should the working pressure rating of a water service pipe be in relation to the water main pressure?

Options:
A. Equal to half the maximum water main pressure at the connection point
B. Less than the maximum water main pressure at the connection point
C. Greater than or equal to the maximum water main pressure at the connection point
D. Double the maximum water main pressure at the connection point

Answer 9

C. Greater than or equal to the maximum water main pressure at the connection point (2216)

Question 10

What is the maximum number of shower heads that can be served by a single shower drain?

Options:
A. 4 shower heads
B. 6 shower heads
C. 8 shower heads
D. Unlimited shower heads

Answer 10

b 6 shower heads

Question 11

What is required when two or more shower heads are served by a single shower drain?

Options:
A. The drain must be oversized to accommodate all shower heads.
B. The floor must be sloped, and the drain positioned to prevent water from one head flowing into the area serving another head.
C. Each shower head must have an individual drain.
D. The drain must be located centrally between the shower heads.

Answer 11

B. The floor must be sloped, and the drain positioned to prevent water from one head flowing into the area serving another head.

Question 12

What are the requirements for performing a Ball Test on pipes?

Options:
A. The ball must float and be the same diameter as the pipe.
B. The ball must be soft and flexible to navigate through bends in the pipe.
C. The ball must be hard, dense enough not to float, and have a diameter of at least 50 mm for pipes NPS 3 or larger, or 25 mm for pipes smaller than NPS 3.
D. The ball must be hollow and larger than the pipe diameter to ensure tight contact.

Answer 12

C. The ball must be hard, dense enough not to float, and have a diameter of at least 50 mm for pipes NPS 3 or larger, or 25 mm for pipes smaller than NPS 3.

Question 13

What is the requirement for connecting drinking fountains to a drainage system?

Options:
A. Drinking fountains must always be directly connected to a sanitary drainage system.
B. Drinking fountains can only be connected to a storm drainage system.
C. Drinking fountains may be indirectly connected to a sanitary drainage system or connected to a storm drainage system, provided a backwater valve is installed if the system is subject to backflow.
D. Drinking fountains do not require connection to any drainage system.

Answer 13

C. Drinking fountains may be indirectly connected to a sanitary drainage system or connected to a storm drainage system, provided a backwater valve is installed if the system is subject to backflow.

Question 14

How should a sterilizer be connected to a drainage system?

Options:
A. It must be directly connected to the drainage system.
B. It must not be connected to the drainage system at all.
C. It must be indirectly connected to the drainage system.
D. It can be either directly or indirectly connected based on preference.

Answer 14

C. It must be indirectly connected to the drainage system.

Question 15

What is the minimum horizontal distance required for connecting a sanitary drainage pipe to a nominally horizontal sanitary drainage pipe or offset in a stack?

Options:
A. 1.5 meters from the bottom of the stack or upper vertical section of the stack if the stack receives a discharge of 10 or more fixture units.
B. 1.5 meters from the bottom of the stack or upper vertical section of the stack if the stack receives a discharge of 30 or more fixture units or from fixtures on 2 or more storeys.
C. 2.0 meters from the bottom of the stack or upper vertical section of the stack regardless of fixture units.
D. No minimum distance is required.

Answer 15

B. 1.5 meters from the bottom of the stack or upper vertical section of the stack if the stack receives a discharge of 30 or more fixture units or from fixtures on 2 or more storeys.

Question 16

What is required for pipes passing through an exterior wall to supply water to the exterior of a building?

Options:
A. A non-frost-proof hydrant outside the building.
B. A frost-proof hydrant or a stop-and-waste cock inside the building close to the wall.
C. Insulated pipes without additional fixtures.
D. A stop-and-waste cock located outside the building.

Answer 16

B. A frost-proof hydrant or a stop-and-waste cock inside the building close to the wall.

Question 17

What must indirect service water heaters be equipped with?

Options:
A. A pressure-relief valve only
B. A temperature-relief valve only
C. Both a pressure-relief valve and a temperature-relief valve on every storage tank
D. Neither a pressure-relief valve nor a temperature-relief valve

Answer 17

C. Both a pressure-relief valve and a temperature-relief valve on every storage tank

Question 18

What protection is required where thermal expansion can occur in a plumbing system?

Options:
A. Protection is not necessary for thermal expansion.
B. Protection must only be provided for pressure-reducing valves.
C. Protection must be provided for check valves, backflow preventers, and pressure-reducing valves.
D. Protection is only required for backflow preventers.

Answer 18

C. Protection must be provided for check valves, backflow preventers, and pressure-reducing valves.

Question 19

What is the maximum cumulative change in direction allowed for a trap arm protected by a vent pipe?

Options:
A. 90°
B. 120°
C. 135°
D. 180°

Answer 19

c 135

Question 20

What are the offset limitations for wet venting?

Options:
A. The offset must not exceed 2.5 m for pipes of NPS 2 or less, or 1.2 m for pipes larger than NPS 2.
B. The offset must not exceed 1.2 m for pipes of NPS 2 or less, or 2.5 m for pipes larger than NPS 2.
C. The offset must not exceed 1.5 m for all pipe sizes.
D. The offset limitations are not applicable to wet venting.

Answer 20

B. The offset must not exceed 1.2 m for pipes of NPS 2 or less, or 2.5 m for pipes larger than NPS 2.

Question 21

Under what conditions is one trap permitted to serve a group of fixtures such as floor drains, shower drains, washing machines, or laboratory sinks?

Options:
A. If the fixtures are in different rooms and are located where they can receive food or organic matter.
B. If the fixtures are in the same room and are not located where they can receive food or other organic matter.
C. If the fixtures are in separate rooms but share a common drain.
D. If the fixtures are equipped with individual traps regardless of location.

Answer 21

B. If the fixtures are in the same room and are not located where they can receive food or other organic matter.

Question 22

Where is it permitted to install an organic solids interceptor in a drainage system?

Options:
A. Downstream of a grease interceptor.
B. Upstream of a grease interceptor.
C. Adjacent to a grease interceptor.
D. Only when a grease interceptor is not present.

Answer 22

B. Upstream of a grease interceptor.

Question 23

What is the maximum spacing of supports for vertical pipes?

Options:
A. 5.0 m
B. 6.0 m
C. 7.5 m
D. 10.0 m

Answer 23

c. 7.5m

Question 24

Where are cold-caulked joints permitted to be used?

Options:
A. For any type of pipe in any plumbing system.
B. Only for bell and spigot pipes in a water system, drainage system, or venting system.
C. Only for pressurized systems in residential plumbing.
D. Cold-caulked joints are not permitted in any plumbing system.

Answer 24

B. Only for bell and spigot pipes in a water system, drainage system, or venting system.

Question 25

What are the requirements for cold-caulked joints in a drainage system?

Options:
A. They must be packed with sand and sealed with any caulking compound.
B. They must be firmly packed with oakum and tightly caulked with cold caulking compound to a depth of not less than 25 mm.
C. They must be loosely packed with oakum and sealed with hot caulking compound.
D. They do not have any specific packing or depth requirements.

Answer 25

B. They must be firmly packed with oakum and tightly caulked with cold caulking compound to a depth of not less than 25 mm.

Question 26

Where is the use of polyethylene water pipe permitted?

Options:
A. For any type of water piping within a building.
B. Only for hot water distribution pipes.
C. Only for a water service pipe.
D. For both water service and drainage systems.

Answer 26

C. Only for a water service pipe.

Question 27

For what purpose is transition solvent cement permitted to be used?

Options:
A. For joining two PVC pipes in a drainage system.
B. For joining two ABS pipes in a drainage system.
C. For joining an ABS drainage system to a PVC drainage system.
D. For sealing threaded pipe connections.

Answer 27

C. For joining an ABS drainage system to a PVC drainage system.

Question 28

Where is cellular core PVC pipe permitted to be used?

Options:
A. In all types of buildings regardless of height or occupancy.
B. Only in commercial buildings up to 5 storeys in height.
C. Only in residential buildings with 1 or 2 dwelling units and row houses not exceeding 3 storeys in height.
D. Only in industrial applications.

Answer 28

C. Only in residential buildings with 1 or 2 dwelling units and row houses not exceeding 3 storeys in height.

Question 29

What is the minimum trap seal depth required for fixtures draining to an acid waste system?

Options:
A. 25 mm
B. 50 mm
C. 75 mm
D. 100 mm

Answer 29

B. 50 mm

Question 30

Where is corrugated steel pipe permitted to be used in a plumbing system?

Options:
A. Inside a building for both storm and sanitary drainage systems.
B. Underground outside a building in a storm drainage system.
C. Above ground for storm drainage systems.
D. Underground outside a building in both storm and sanitary drainage systems.

Answer 30

B. Underground outside a building in a storm drainage system.

Question 31

What are the requirements for screwed cast-iron water fittings used in a water system?

Options:
A. They must be unlined and untreated.
B. They must be painted with a waterproof coating.
C. They must be cement-mortar lined or galvanized.
D. They must be coated with epoxy resin.

Answer 31

C. They must be cement-mortar lined or galvanized.

Question 32

What material must plugs, caps, nuts, or bolts intended to be removable from a ferrous fitting be made of?

Options:
A. Ferrous material
B. Non-ferrous material
C. Galvanized steel
D. Any material approved for plumbing use

Answer 32

B. Non-ferrous material

Question 33

Where are wiped joints permitted to be used?

Options:
A. For any type of pipe in a plumbing system.
B. Only for sheet lead, lead pipe, or between such pipe and copper pipe or a ferrule.
C. Only for copper pipe connections.
D. Only for non-metallic pipe systems.

Answer 33

B. Only for sheet lead, lead pipe, or between such pipe and copper pipe or a ferrule.

Question 34

What are the requirements for wiped joints in straight pipe?

A. They must be made of solder and have a thickness of 5 mm at the thickest part.
B. They must be made of solder, have an exposed surface at least 19 mm wide on each side of the joint, and be not less than 10 mm thick at the thickest part.
C. They must be made of any material with an exposed surface of 19 mm wide.
D. They must have an exposed surface of 10 mm wide and a thickness of at least 19 mm.

Answer 34

B. They must be made of solder, have an exposed surface at least 19 mm wide on each side of the joint, and be not less than 10 mm thick at the thickest part.

Question 35

What is required for wiped flanged joints?

Options:
A. They must be reinforced with a lead flange at least 10 mm wide.
B. They must be reinforced with a lead flange that is not less than 19 mm wide.
C. They do not require reinforcement.
D. They must have a soldered flange at least 19 mm wide.

Answer 35

B. They must be reinforced with a lead flange that is not less than 19 mm wide.

Question 36

What are the requirements for roof drains in a plumbing system?

Options:
A. Roof drains must be left unconnected to allow natural drainage.
B. Roof drains must be securely connected to a leader with provision for expansion.
C. Roof drains must only be connected to a storm drainage system without expansion provision.
D. Roof drains must be directly connected to the sanitary drainage system.

Answer 36

B. Roof drains must be securely connected to a leader with provision for expansion.

Question 37

What is the restriction on bending Types M and DWV copper tube?

Options:
A. They can be bent if heated.
B. They can only be bent at specific angles.
C. They shall not be bent.
D. They can be bent if the radius is large enough.

Answer 37

C. They shall not be bent.

Question 38

How should a fixture or device be connected when it is indirectly connected to a drainage system?

Options:
A. By directly connecting the fixture drain to the sanitary drainage system.
B. By terminating the fixture drain below the flood level rim of a directly connected fixture.
C. By terminating the fixture drain above the flood level rim of a directly connected fixture to form an air break.
D. By using a backwater valve without an air break.

Answer 38

C. By terminating the fixture drain above the flood level rim of a directly connected fixture to form an air break.

Question 39

When is an additional circuit vent required based on the cumulative horizontal change in direction of a branch?

Options:
A. When the cumulative horizontal change in direction exceeds 30° between vent pipe connections.
B. When the cumulative horizontal change in direction exceeds 45° between vent pipe connections.
C. When the cumulative horizontal change in direction exceeds 60° between vent pipe connections.
D. Additional circuit vents are not required for changes in direction.

Answer 39

B. When the cumulative horizontal change in direction exceeds 45° between vent pipe connections.

Question 40

When is an additional circuit vent required based on the number of fixtures connected to a branch?

Options:
A. When more than 5 circuit-vented fixtures are connected to a branch.
B. When more than 6 circuit-vented fixtures are connected to a branch.
C. When more than 8 circuit-vented fixtures are connected to a branch between vent pipe connections.
D. When more than 10 circuit-vented fixtures are connected to a branch.

Answer 40

C. When more than 8 circuit-vented fixtures are connected to a branch between vent pipe connections.

Question 41

What is the minimum nominal pipe size allowed for an offset relief vent relative to the stack vent?

Options:
A. The same size as the stack vent.
B. One NPS smaller than the stack vent.
C. Two NPS smaller than the stack vent.
D. One NPS larger than the stack vent.

Answer 41

B. One NPS smaller than the stack vent.

Question 42

What is the minimum nominal pipe size allowed for yoke vents relative to the pipes they are connected to?

Options:
A. The same size as the smallest pipe to which they are connected.
B. One NPS smaller than the smallest pipe to which they are connected.
C. Two NPS smaller than the smallest pipe to which they are connected.
D. One NPS larger than the smallest pipe to which they are connected.

Answer 42

B. One NPS smaller than the smallest pipe to which they are connected.

Question 43

What is the minimum nominal pipe size for a vent pipe serving a manhole within a building?

Options:
A. NPS 1
B. NPS 1.5
C. NPS 2
D. NPS 3

Answer 43

C. NPS 2

Question 44

What is the minimum nominal pipe size for a vent pipe serving a macerating toilet system with a sump?

Options:
A. NPS 1
B. NPS 1 1/4
C. NPS 1 1/2
D. NPS 2

Answer 44

C. NPS 1 1/2

Question 45

When is a check valve required at the building end of a water service pipe?

Options:
A. When the pipe is made of metal and used for hot water.
B. When the pipe is made of plastic that is suitable for cold water use only.
C. When the pipe is used for both hot and cold water.
D. When the pipe is made of plastic suitable for hot water use.

Answer 45

B. When the pipe is made of plastic that is suitable for cold water use only.

Question 46

What must tank-type water closets be equipped with to prevent back-siphonage?

Options:
A. A check valve
B. A back-siphonage preventer
C. A pressure-reducing valve
D. An air admittance valve

Answer 46

B. A back-siphonage preventer

Question 47

What is prohibited for dishwashing sinks and food preparation sinks?

Options:
A. Having exposed overflows
B. Being connected to a venting system
C. Having concealed overflows
D. Being indirectly connected to the drainage system

Answer 47

C. Having concealed overflows

Question 48

Where can tubular metal or plastic traps be used in a plumbing system?

Options:
A. In any location, accessible or not.
B. Only in concealed locations.
C. Only in accessible locations.
D. In locations requiring no maintenance.

Answer 48

C. Only in accessible locations.

Question 49

What type of floor flange is permitted when using cast-iron or plastic pipe?

Options:
A. Only a metal floor flange is permitted.
B. Only a plastic floor flange is permitted, regardless of the pipe material.
C. A floor flange of the same material as the pipe is permitted.
D. Any floor flange is permitted, regardless of the pipe material.

Answer 49

C. A floor flange of the same material as the pipe is permitted.

Question 50

Where are compression fittings prohibited in a plumbing system?

Options:
A. Above ground in exposed locations.
B. Underground under a building.
C. Inside walls or ceilings.
D. In any part of the plumbing system.

Answer 50

B. Underground under a building.

Question 51

A copper tube is being installed underground beneath a building. The installer plans to use soldered joints for the connections. Is this installation compliant with plumbing standards, and if not, what alternatives are allowed?

Options:
A. Yes, soldered joints are compliant for underground copper tube installations.
B. No, soldered joints are not compliant; only threaded fittings can be used underground.
C. No, soldered joints are not compliant; connections must be made using flared or compression fittings, or brazed with a brazing alloy.
D. No, soldered joints are not compliant; adhesive bonding is required for underground copper tube installations.

Answer 51

C. No, soldered joints are not compliant; connections must be made using flared or compression fittings, or brazed with a brazing alloy.

Question 52

A vent stack is being designed to serve multiple fixtures. Under what condition is the vent stack considered compliant when the total hydraulic load does not exceed 8 fixture units?

Options:
A. The vent stack must be increased in size to accommodate additional fixtures.
B. The vent stack is compliant as long as the connected fixtures do not exceed 8 fixture units in total hydraulic load.
C. The vent stack is compliant only if the fixtures are located on the same floor.
D. The vent stack must include a relief vent regardless of the fixture unit load.

Answer 52

B. The vent stack is compliant as long as the connected fixtures do not exceed 8 fixture units in total hydraulic load.

Question 53

When is an offset relief vent required for a stack with a horizontal offset?

Options:
A. When the horizontal offset is less than 1.5 m and the stack passes through only one storey.
B. When the horizontal offset exceeds 1.5 m, the upper vertical portion of the stack passes through more than 2 storeys, and the hydraulic load is more than 100 fixture units.
C. When the horizontal offset is exactly 1.5 m long and the hydraulic load exceeds 50 fixture units.
D. When the horizontal offset is more than 1.5 m and the stack receives a load of exactly 100 fixture units, regardless of the number of storeys.

Answer 53

B. When the horizontal offset exceeds 1.5 m, the upper vertical portion of the stack passes through more than 2 storeys, and the hydraulic load is more than 100 fixture units.

Question 54

What are the requirements for a fresh air inlet when a building trap is installed?

Options:
A. It must be NPS 4 or larger and connected downstream of the building trap within 1.2 m of the nearest fixture.
B. It must be NPS 4 or larger and connected upstream of the building trap within 1.2 m, downstream of any other connection.
C. It must be NPS 3 or larger and connected upstream of the building trap, downstream of any other connection.
D. It must be NPS 4 or larger and connected anywhere upstream of the building trap.

Answer 54

B. It must be NPS 4 or larger and connected upstream of the building trap within 1.2 m, downstream of any other connection.

Question 55

What is the minimum nominal pipe size for a vent pipe serving an oil interceptor located outside a building in areas where frost closure may occur?

Options:
A. NPS 2
B. NPS 2 1/2
C. NPS 3
D. NPS 4

Answer 55

C. NPS 3

Question 56

What are the requirements for a water closet installed in a washroom for public use?

Options:
A. It must be of the standard round type with any type of seat.
B. It must be of the elongated type with a seat of the open front type.
C. It must be of the elongated type with a closed front seat.
D. It must be of the standard round type with an open front seat.

Answer 56

B. It must be of the elongated type with a seat of the open front type.

Question 57

Where is the use of vitrified clay pipe and fittings permitted in a drainage system?

Options:
A. For any part of a drainage system, above or below ground.
B. Only for an underground part of a drainage system.
C. Only for above-ground portions of a drainage system.
D. For stormwater systems but not for sanitary drainage.

Answer 57

B. Only for an underground part of a drainage system.

Question 58

Where is the use of concrete pipe prohibited in a plumbing system?

Options:
A. For any part of a drainage system.
B. Above ground inside a building.
C. Underground outside a building.
D. For stormwater drainage systems.

Answer 58

B. Above ground inside a building.

Question 59

Where is the use of copper tube prohibited in a plumbing system?

Options:
A. For any fixture drain or vent pipe.
B. For the fixture drain or the portion of the vent pipe below the flood level rim of a urinal.
C. For the vent pipe above the flood level rim of a urinal.
D. For connections to potable water supply systems.

Answer 59

B. For the fixture drain or the portion of the vent pipe below the flood level rim of a urinal.

Question 60

In which applications is the use of lead waste pipe and fittings prohibited?

Options:
A. In a drainage system only.
B. In a water system or as a building sewer.
C. In underground drainage systems only.
D. In all plumbing applications.

Answer 60

B. In a water system or as a building sewer.

Question 61

Under what conditions are drilled and tapped joints allowed in sanitary drainage or vent pipes and fittings?

Options:
A. They are permitted in all sanitary drainage and vent pipes without restrictions.
B. They are prohibited in all sanitary drainage and vent pipes.
C. They are allowed only when suitable provision has been made for drilling and tapping.
D. They are permitted only for vent pipes above the roofline.

Answer 61

C. They are allowed only when suitable provision has been made for drilling and tapping.