When is it appropriate to work under the trolley wire?

Working under the trolley wire is appropriate when it is insulated because insulation serves as a protective barrier, preventing accidental contact with the live wire. This safety measure reduces the risk of electric shock to personnel who might be working in close proximity to the energized line. Insulation effectively maintains a safe working environment, allowing workers to perform their tasks without exposing themselves to immediate electrical hazards.

In contrast, covering the trolley wire may not provide the same level of assurance if the covering is not designed for electrical safety, and working under a bare trolley wire poses a significant risk regardless of the situation. Limiting work to inspection only does not address scenarios where operational work is needed under insulated wires, which is why insulation remains the primary focus for safe work practices in these environments.