306A Fixture Installation 2 — Questions and Answers
Question 1: What is the correct method for securing a pedestal lavatory to the wall?
- The pedestal alone supports the lavatory
- The lavatory must be secured to a wall-mounted bracket with the pedestal providing additional support and concealing the piping (Correct answer)
- Adhesive bonding to the wall is sufficient
- Only the drain connection holds it in place
Correct answer: The lavatory must be secured to a wall-mounted bracket with the pedestal providing additional support and concealing the piping
A pedestal lavatory must be secured to a wall-mounted bracket or hanger bolt anchored into the wall framing. The pedestal provides supplementary support and conceals the drain and supply piping but should not bear the entire load.
Question 2: What is the required clearance from the centre of a water closet to any side wall or obstruction?
- 300 mm (12 inches)
- 380 mm (15 inches) (Correct answer)
- 450 mm (18 inches)
- 600 mm (24 inches)
Correct answer: 380 mm (15 inches)
A minimum of 380 mm (15 inches) clearance is required from the centre of the water closet to any side wall, partition, or vanity to provide adequate space for comfortable use.
Question 3: When installing a kitchen sink, what type of strainer assembly is typically used?
- Flat drain cover only
- Basket strainer assembly with a compression seal and locknut (Correct answer)
- Open tailpiece without a strainer
- Pop-up drain assembly
Correct answer: Basket strainer assembly with a compression seal and locknut
A basket strainer assembly with plumber's putty or silicone seal, a rubber gasket, and a locknut is the standard installation for kitchen sinks. The removable basket catches food debris to prevent drain blockages.
Question 4: What material should be used to seal the joint between a lavatory pop-up drain and the basin?
- Pipe thread compound only
- Plumber's putty or silicone sealant around the drain flange (Correct answer)
- Teflon tape on the threads
- Epoxy adhesive
Correct answer: Plumber's putty or silicone sealant around the drain flange
Plumber's putty (or silicone sealant on certain basin materials like marble or cultured stone) is applied around the drain flange to create a watertight seal between the drain body and the lavatory basin.
Question 5: What is the proper height for a shower head in a standard residential shower?
- 1500 mm (5 feet) from the shower floor
- 1800 mm (6 feet) from the shower floor
- 2000 mm (6 feet 8 inches) from the shower floor (Correct answer)
- 2400 mm (8 feet) from the shower floor
Correct answer: 2000 mm (6 feet 8 inches) from the shower floor
The standard shower head height is approximately 2000 mm (6 feet 8 inches or 80 inches) from the shower floor, providing adequate clearance for most users while allowing effective water coverage.
Question 6: What type of connection is used to attach a toilet to the water supply?
- Soldered copper connection
- Braided stainless steel supply line with compression fittings (Correct answer)
- Glued PVC connection
- Threaded galvanized nipple
Correct answer: Braided stainless steel supply line with compression fittings
A braided stainless steel supply line with compression fittings is the modern standard for connecting the angle stop (shut-off valve) to the fill valve on the toilet tank. These flexible lines are durable, easy to install, and resist corrosion.
306A Fixture Installation 2
What is the correct method for securing a pedestal lavatory to the wall?