PC Plumber Safety & Code Compliance 2

Question 1

When working in a confined space with a potential for oxygen deficiency, what is the minimum acceptable oxygen level before entry is permitted?

Accepted Answer

19.5%

Answer

OSHA requires a minimum of 19.5% oxygen in confined spaces before workers may enter without supplied-air respirators.

Question 2

According to the IPC, what is the minimum distance a cleanout must be located from a wall or obstruction to allow rodding access?

Accepted Answer

18 inches

Answer

The IPC requires cleanouts to be installed with at least 18 inches of clearance in front for rodding equipment access.

Question 3

A plumber discovers asbestos pipe insulation while roughing in new supply lines. What is the correct immediate action?

Accepted Answer

Stop work, leave the area undisturbed, and notify supervisor

Answer

Disturbing asbestos-containing materials requires stopping all work immediately and reporting to a supervisor so licensed abatement can be arranged.

Question 4

Under the UPC, what is the required air gap between the flood level rim of a fixture and the lowest point of a potable water supply outlet?

Accepted Answer

2 pipe diameters (minimum 1 inch)

Answer

The UPC requires an air gap of at least twice the inside diameter of the supply pipe, with a minimum of 1 inch, to prevent backflow contamination.

Question 5

Which OSHA standard specifically governs excavation and trenching safety for plumbers working in trenches deeper than 5 feet?

Accepted Answer

29 CFR 1926.652

Answer

29 CFR 1926.652 (Subpart P) governs excavation and trenching safety, requiring protective systems for trenches 5 feet or deeper.

(PC) Plumber Certification Practice Test