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High voltage electric cables should be labeled at both ends and every 2-3 meters to ensure safety and facilitate easy identification. Proper labeling is crucial in minimizing the risks associated with working around high voltage cables. When cables are marked at both ends, personnel can readily ascertain where connections are made and understand the cable's path, which is essential for maintenance and emergency response.

Moreover, labeling every 2-3 meters provides ongoing visibility and reference points along the length of the cable, allowing anyone working in the vicinity to be aware of the presence of high voltage lines, even from a distance. This practice is particularly important in complex environments, such as data centers or industrial sites, where multiple cables may run close together, increasing the potential for accidents if cables are not clearly identified.

Labeling formats and guidelines are typically based on safety standards set by regulatory bodies and industry best practices. These guidelines emphasize that proper identification is key to maintaining both operational efficiency and a safe working environment.