306A Water Supply Systems

Question 1

What is the minimum hot water supply temperature at a residential fixture outlet according to Canadian plumbing standards?

Accepted Answer

43°C

Answer

The minimum hot water temperature at a residential fixture outlet is 43°C (110°F) to ensure adequate hot water delivery while balancing scald prevention.

Question 2

What is the minimum water pressure required at a fixture outlet for proper operation?

Accepted Answer

140 kPa (20 psi)

Answer

A minimum of 140 kPa (20 psi) is required at the most remote fixture outlet to ensure adequate flow for proper fixture operation.

Question 3

What is the maximum static water pressure permitted at a fixture outlet?

Accepted Answer

552 kPa (80 psi)

Answer

The maximum static pressure at a fixture outlet is 552 kPa (80 psi). A pressure-reducing valve must be installed when the supply pressure exceeds this limit to protect fixtures and piping.

Question 4

What type of valve must be installed on the water supply to each dwelling unit?

Accepted Answer

Gate valve or ball valve (full-port shutoff)

Answer

A full-port shutoff valve (gate or ball valve) is required at each dwelling unit supply so the water can be completely isolated for maintenance without affecting other units.

Question 5

What is the purpose of a water hammer arrestor in a supply system?

Accepted Answer

To absorb the shock wave caused by sudden valve closure

Answer

Water hammer arrestors contain a sealed air chamber that absorbs the pressure surge (water hammer) created when valves close suddenly, protecting pipes and fittings from damage.

Red Seal Plumber 306A Practice Test

Red Seal Plumber 306A Practice Test

306A Water Supply Systems