Journeyman Plumbers Exam General Plumbing Regulations 3

Question 1

Under IPC, what is the maximum developed length of a trap arm (from trap weir to vent) for a 1-1/2 inch pipe?

Accepted Answer

5 feet

Answer

The IPC allows a maximum trap arm length of 5 feet for a 1-1/2 inch pipe.

Question 2

Which type of valve is required to be installed on the water supply to a water heater to allow for servicing?

Accepted Answer

Gate valve or full-port ball valve

Answer

A gate valve or full-port ball valve must be installed on the cold water supply to a water heater to allow isolation for service.

Question 3

Under the IPC, the maximum water pressure at any fixture in a building shall not exceed:

Accepted Answer

80 psi

Answer

The IPC sets 80 psi as the maximum allowable water pressure at any fixture; a pressure reducing valve must be installed if supply exceeds this.

Question 4

A plumber installs a clothes washer standpipe. Under IPC, what is the minimum height of the standpipe above the trap?

Accepted Answer

24 inches

Answer

IPC requires the standpipe for a clothes washer to extend at least 18 inches but not more than 42 inches above the trap.

Question 5

Which of the following materials is NOT approved for potable water supply piping under the IPC?

Accepted Answer

ABS pipe

Answer

ABS (acrylonitrile butadiene styrene) is a drain-waste-vent material and is not approved for potable water supply piping.

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