Quiz: 2024 International Residential Code (IRC) Chapter 29 Water Supply And Distribution

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1. Under what specific conditions can plumbing fixtures and appliances be supplied with nonpotable water instead of potable water?

Only if a separate, color-coded piping system is used.
Where treated rainwater, treated graywater, or municipal reclaimed water is supplied to water closets, urinals, and trap primers.
If the local jurisdiction grants a special permit for nonpotable water use.
For outdoor irrigation purposes only.

2. What is the minimum required letter height for signage identifying nonpotable water outlets?

0.25 inches (6.35 mm)
0.5 inches (12.7 mm)
0.75 inches (19.05 mm)
1 inch (25.4 mm)

3. A nonpotable water distribution pipe with a 4-inch diameter is being installed. What color should the identification be, and what is the minimum required letter size for the marking?

Blue, 0.75 inches
Green, 1.25 inches
Purple, 1.25 inches
Purple, 2.5 inches

4. According to the code, what is prohibited regarding cross-connections in a potable water supply system?

Connections between a potable public water supply and any individual water supply.
Connections that could contaminate the water supply, even with an approved backflow preventer.
Any connection to a nonpotable system.
The use of backflow prevention devices for high hazard applications.

5. For a 'High or low hazard' application involving both 'Backpressure or backsiphonage' for sizes 3/8" – 16", which backflow prevention assembly is typically used according to Table P2902.3?

Double-check backflow prevention assembly
Pressure vacuum breaker assembly
Reduced pressure principle backflow prevention assembly
Spill-resistant vacuum breaker

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