What is an appropriate action if a cable's identity is not obvious from its appearance or location?

Identifying a cable by electrical means is an appropriate action when its identity is not obvious. This approach typically involves using testing equipment to determine the cable's function or status without risking damage or safety. For example, a multimeter or cable tracer can help identify voltage, continuity, or specific characteristics that can inform you whether the cable carries power and to what extent it is being utilized. This method is essential in ensuring both safety and proper handling of the cable. By verifying the cable's identity, you protect yourself and others from potential hazards associated with unknown wiring.

Other options could lead to unsafe practices or misinformation about the cable's utility. For instance, ignoring the cable may lead to missing critical infrastructure changes or risks. Assuming it is not in use could lead to disconnecting an active cable, causing potential disruptions or hazards. Disconnecting power to all cables is overly broad and impractical, as it may unnecessarily interrupt other systems and services that rely on live connections. Therefore, identifying the cable accurately using electrical means is the most effective and responsible action.