Which device may be required for safe operation when working near an unenclosed lift?

An audio-visual device is essential for ensuring safe operation near an unenclosed lift as it provides critical notifications and warnings to individuals in the vicinity. This type of device may emit sound signals or visual signals to alert operators and pedestrians about the lift's operational status, such as when it's in motion or if there are safety concerns.

In the context of an unenclosed lift, where the risk of accidentally approaching the edge or being in the path of the lift is heightened, the presence of audio-visual alerts helps to enhance awareness and prevent accidents. Individuals can respond appropriately, ensuring they maintain a safe distance while the lift is operational.

While a manual override system, emergency brake, and weight sensor are important safety components in their own right, they serve different functions primarily related to lift operation itself rather than immediate hazard communication to those nearby. Thus, the emphasis on audio-visual devices is paramount for the safety of individuals working around unenclosed lifts.