IPC - International Plumbing Code Water Supply and Distribution Questions and Answers

Question 1

According to the IPC, what is the minimum required size for a water service pipe?

Accepted Answer

3/4 inch

Answer

1/2 inch

Answer

5/8 inch

Answer

1 inch

Question 2

A newly installed potable water distribution system must be tested for leaks. According to the IPC, what is the required test pressure if using water, and for how long must it be maintained?

Accepted Answer

Not less than the working pressure under which it is to be used, for 15 minutes

Answer

At working pressure for 10 minutes

Answer

50 psi above working pressure for 30 minutes

Answer

100 psi for 60 minutes

Question 3

In a commercial building, the static water pressure from the city main is found to be 95 psi. What action is required by the IPC?

Accepted Answer

Install a pressure-reducing valve to reduce the pressure to 80 psi or less.

Answer

No action is required as this is within acceptable limits.

Answer

Install a pressure-relief valve set at 100 psi.

Answer

Install water hammer arrestors at all fixtures.

Question 4

Which of the following is an unacceptable location for a potable water service pipe according to the IPC?

Accepted Answer

Located in, under, or above a septic tank drainage field.

Answer

In the same trench as the building sewer, with proper separation.

Answer

Crossing under a driveway.

Answer

Within 5 feet of an electrical grounding conductor.

Question 5

A plumber is installing a hot water storage tank in an attic where leakage could cause damage to the structure below. Which of the following is required by the IPC?

Accepted Answer

Installation of the tank within a corrosion-resistant pan with a drain.

Answer

A temperature and pressure relief valve only.

Answer

Seismic straps, regardless of the geographic location.

Answer

A dedicated shutoff valve located in the living space below.

Question 6

To protect the potable water supply, a hose bibb must be protected by which of the following?

Accepted Answer

An atmospheric vacuum breaker or a permanently attached hose connection vacuum breaker.

Answer

A reduced pressure principle backflow preventer.

Answer

A double check valve assembly.

Answer

A barometric loop.