Arizona Plumbing Practice Exam

What color code is assigned to identify telephone and telegraph systems in underground utilities?

1. Safety yellow

2. Safety alert orange

3. Safety blue

4. Safety green

The correct answer is: Safety alert orange

The color code designated for identifying telephone and telegraph systems in underground utilities is safety alert orange. This color plays a critical role in enhancing safety and awareness for workers and individuals who may encounter these utilities during excavation or construction activities. The use of safety alert orange signals the presence of non-potentially hazardous utilities, such as communication lines, thus allowing workers to take necessary precautions while digging. Safety yellow, safety blue, and safety green are assigned to other utilities—yellow is typically associated with gas and oil, blue is for potable water, and green commonly indicates sewers and drainage systems. Understanding these color codes is essential for preventing accidents and ensuring the proper handling of different types of underground utilities.