What does the marking color red indicate?

The marking color red indicates the presence of electric installations or high voltage. In the context of pipeline marking and utility locational systems, red is universally recognized as the color for electrical lines or hazards. This is based on guidelines established by organizations such as the American Public Works Association (APWA), which standardize color coding for underground utility marking to enhance safety and prevent accidents during construction and excavation activities.

While other colors signify different types of utilities—such as blue for water, yellow for gas, and orange for telecommunications—red is specifically reserved for electric utilities, helping workers and the public to quickly identify potential electrical hazards. This system is essential for ensuring safe practices in fields like construction, excavation, and maintenance work, where clarity in marking can prevent dangerous incidents.