What is a key factor to consider when setting up a mobile crane?

When setting up a mobile crane, it is crucial to consider multiple factors to ensure safety and operational efficiency. Proximity to power lines is essential to prevent accidental contact, which could lead to electrical hazards and pose serious risks to personnel and equipment. Weather conditions also play a vital role, as wind speed, precipitation, and temperature can affect the crane's stability and the safety of the lift. Additionally, understanding the load size is critical, as it determines the crane's lifting capacity and affects balance and stability during operations.

Given that all these factors significantly impact the safety and effectiveness of crane operations, the comprehensive nature of the correct answer — taking into account proximity to power lines, weather conditions, and load size — highlights the necessity for thorough risk assessment before engaging in lifting activities. This holistic view promotes a safer work environment and enhances the likelihood of a successful lift.