A 3-phase load that requires protection from falling must have what type of systems in place?

A 3-phase load requiring protection from falling must have guardrail systems in place. Guardrail systems are designed to provide a physical barrier that prevents workers or materials from falling off elevated surfaces or work areas. These systems are crucial in ensuring safety, especially in environments where loads are lifted or moved, as they help to contain any potential hazards associated with falling objects or personnel.

Implementing guardrail systems allows for safe movement and access around areas with elevated heights, maintaining a clear boundary to mitigate fall risks. While other options, such as safety nets and signage warnings, contribute to overall safety, guardrail systems specifically focus on physical fall protection, making them the most appropriate choice for the question.