Which is a common method for identifying phases in power lines?

Using color-coded tape or markers is a widely accepted method for identifying phases in power lines because it provides a clear and easily recognizable visual cue for linemen and technicians working with electrical systems. Each phase is assigned a specific color, which allows workers to quickly and effectively differentiate between the phases during installation, maintenance, or troubleshooting procedures. This method enhances safety and efficiency in the field, reducing the likelihood of errors that could arise from misidentification of the phases.

The other methods listed, while possibly useful in certain contexts, do not provide the same clarity and immediate recognition as color-coding. Overhead signage, for example, may not always be visible or legible from all angles or distances. Audible signals could easily be misinterpreted or overlooked in a noisy environment, making them less reliable for phase identification. Digital displays might require additional equipment and power, which could complicate operations in some field scenarios. Therefore, color-coded tape or markers remain the standard approach for quick and accurate phase identification.