North Carolina Building Contractor License Practice Exam

The color used for marking electrical lines is?

1. Red

2. Yellow

3. Blue

4. Black

The correct answer is: Red

The color red is used for marking electrical lines because it is universally recognized for its warning properties and attention-grabbing qualities. In various industry standards, including the American Public Works Association (APWA) color code for underground utility marking, red specifically denotes electric power lines, cables, or conduits. This helps ensure safety during excavation or construction activities, as it clearly indicates the presence of potentially dangerous electrical utilities. The use of specific colors aids workers and the public in identifying utility types quickly and reduces the chances of accidental damage or hazards during utility work. Each color in the marking system has its own designated meaning, which contributes to organized and efficient identification of utilities.