PC PC Plumbing Codes & Regulations 2

Question 1

Under the IPC, what is the maximum developed length of a trap arm for a 2-inch drain?

Accepted Answer

6 feet

Answer

The IPC allows a maximum developed length of 6 feet for a 2-inch trap arm from the trap weir to the inner edge of the vent.

Question 2

Which type of backflow prevention device is required when connecting an irrigation system to a potable water supply?

Accepted Answer

Reduced pressure zone (RPZ) device

Answer

An RPZ (reduced pressure zone) backflow preventer is required for irrigation systems connected to potable water due to the high hazard from pesticides and fertilizers.

Question 3

Per the IPC, what is the minimum slope per foot required for a horizontal drain pipe with a 3-inch diameter?

Accepted Answer

1/8 inch

Answer

The IPC requires a minimum slope of 1/8 inch per foot for horizontal drain pipes with a diameter of 3 inches or greater.

Question 4

In a multi-story building, a plumber installs a stack that carries both soil and waste. What type of stack is this called?

Accepted Answer

Soil and waste stack

Answer

A vertical pipe that carries both soil (from water closets) and waste (from other fixtures) is called a soil and waste stack.

Question 5

What plumbing code section governs the sizing of water supply piping?

Accepted Answer

Chapter 6 — Water Supply and Distribution

Answer

Chapter 6 of the IPC covers water supply and distribution, including the sizing of supply piping based on fixture units and pressure.

(PC) Plumber Certification Practice Test

(PC) Plumber Certification Practice Test

PC PC Plumbing Codes & Regulations 2