PC Inspection & Quality Control 5

Question 1

An inspector finds that a bathtub drain overflow plate is missing after the final finish work. Why is this a code violation?

Accepted Answer

It leaves an open penetration in the tub wall that could allow sewer gas to enter the bathroom

Answer

The overflow plate covers the access to the overflow tube; without it, sewer odors and gas can enter the bathroom through the open fitting.

Question 2

During inspection of a multi-story building's soil stack, the inspector requires that a stack vent or stack cleanout be accessible at each floor. What is the code rationale?

Accepted Answer

To enable clearing of blockages without demolishing walls or ceilings

Answer

Cleanouts at each floor of a soil stack allow plumbers to snake blockages from the nearest cleanout above the obstruction, avoiding unnecessary demolition.

Question 3

A plumber installs a dishwasher drain that connects directly to the drain tailpiece of the kitchen sink without a high loop or air gap. What does the inspector cite?

Accepted Answer

A potential cross-connection allowing contaminated drain water to back-siphon into the dishwasher

Answer

Without a high loop or air gap, a backed-up or siphoning sink drain can push contaminated water back into the dishwasher, creating a cross-connection violation.

Question 4

What is the inspector verifying when confirming that a vacuum breaker is installed on a hose bibb?

Accepted Answer

That the hose bibb is protected from backflow if a hose is submerged in a contaminated source

Answer

A vacuum breaker prevents back-siphonage through a garden hose from a pool, pond, or chemical sprayer back into the potable water supply.

Question 5

An inspector checks the support spacing for cast iron soil pipe suspended from the structure. Which standard applies?

Accepted Answer

Support every 4 feet for horizontal runs and at each floor for vertical runs

Answer

Cast iron soil pipe must be supported at maximum 5-foot intervals horizontally (IPC; some codes allow 4 feet) and at each floor level for vertical runs to prevent sag and joint stress.

(PC) Plumber Certification Practice Test

(PC) Plumber Certification Practice Test

PC Inspection & Quality Control 5