Master Plumber Exam Plumbing Codes and Regulations 4

Question 1

Under the IPC, what is the required test pressure for a new water distribution system before it is put into service?

Accepted Answer

100 psi for 15 minutes

Answer

The IPC requires new water distribution systems to be tested at 100 psi for a minimum of 15 minutes without leakage.

Question 2

Which code section of the IPC specifically governs storm drainage systems?

Accepted Answer

Chapter 10

Answer

IPC Chapter 10 covers storm drainage, including roof drains, leaders, and storm sewer connections.

Question 3

According to the IPC, a floor drain installed in a parking garage must be connected to:

Accepted Answer

A sand/oil interceptor before the sewer

Answer

Parking garage floor drains must discharge through a sand and oil interceptor to remove petroleum products before entering the sewer.

Question 4

Under model plumbing codes, what is the minimum number of fixture units a 4-inch vertical soil stack can carry?

Accepted Answer

256 DFU

Answer

Per IPC Table 710.1, a 4-inch vertical stack can carry 256 drainage fixture units.

Question 5

The IPC requires that vent pipes penetrating a roof extend a minimum of how far above the roof surface in areas subject to frost?

Accepted Answer

12 inches

Answer

In frost areas the IPC requires vent terminals to extend at least 12 inches above the roof to prevent frost closure.

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