PC Plumber Safety & Code Compliance 3

Question 1

Under the IPC, what type of pipe is prohibited from being used for underground installation inside a building for drain, waste, and vent systems?

Accepted Answer

Galvanized steel

Answer

Galvanized steel pipe is not approved for underground DWV use inside buildings because it corrodes rapidly when buried and in contact with waste.

Question 2

A permit is required to replace a water heater in most jurisdictions. Which of the following work typically does NOT require a plumbing permit?

Accepted Answer

Replacing a faucet washer or cartridge

Answer

Minor repairs such as replacing faucet washers or cartridges are maintenance tasks exempt from permit requirements in most plumbing codes.

Question 3

What is the primary purpose of a backflow preventer installed on an irrigation system connected to potable water?

Accepted Answer

Prevent contaminated water from flowing back into the drinking supply

Answer

Backflow preventers protect the potable water supply from contamination caused by reverse flow from the irrigation system.

Question 4

According to OSHA's lockout/tagout standard (29 CFR 1910.147), before servicing a water heater with hazardous energy, what must a plumber do first?

Accepted Answer

Isolate all energy sources and verify zero energy state

Answer

LOTO requires the plumber to isolate all energy sources (gas, electric, water pressure) and verify zero energy state before servicing.

Question 5

The International Plumbing Code requires that all above-ground DWV piping be supported at intervals not exceeding how many feet for 2-inch horizontal PVC pipe?

Accepted Answer

4 feet

Answer

The IPC requires horizontal PVC DWV pipe 2 inches and smaller to be supported at maximum 4-foot intervals to prevent sagging and improper drainage slope.

(PC) Plumber Certification Practice Test

(PC) Plumber Certification Practice Test

PC Plumber Safety & Code Compliance 3