PC PC Plumbing Codes & Regulations

Question 1

Which model plumbing code is most widely adopted by US states and municipalities?

Accepted Answer

International Plumbing Code (IPC)

Answer

The International Plumbing Code (IPC), published by the ICC, is the most widely adopted model plumbing code across US states and municipalities.

Question 2

Under the IPC, what is the minimum trap arm length allowed for a 1.5-inch drain from a lavatory?

Accepted Answer

No minimum is specified

Answer

The IPC does not specify a minimum trap arm length, but does require that the trap arm slope toward the drain and not exceed the maximum allowed distance.

Question 3

A plumber installs a new water closet in a commercial building. According to the IPC, what is the minimum required flush volume for a tank-type water closet?

Accepted Answer

1.6 gpf

Answer

The IPC requires tank-type water closets to use a maximum of 1.6 gallons per flush (gpf), which is also the federal maximum established by the Energy Policy Act.

Question 4

According to plumbing code, a vent pipe that terminates through the roof must extend at least how far above the roof surface in a climate with fewer than 30 days below 0°F?

Accepted Answer

6 inches

Answer

In areas with fewer than 30 days per year below 0°F, vent pipes must extend at least 6 inches above the roof surface to prevent frost closure and allow proper air flow.

Question 5

Which of the following fixtures is NOT required to be individually vented under standard IPC provisions?

Accepted Answer

Floor drain

Answer

Floor drains may be connected to a common vent system and are not individually required to be vented in most IPC provisions.

(PC) Plumber Certification Practice Test

(PC) Plumber Certification Practice Test

PC PC Plumbing Codes & Regulations