Explain the difference between overhead cranes and mobile cranes in terms of typical work environments and hazards.

• A. Overhead cranes are used outdoors only; mobile cranes are used indoors
• B. Overhead cranes run on rails above work areas with pinch points and electrical hazards; mobile cranes travel on roads with stable ground and traffic control; both have hazards
• C. Overhead cranes move on wheels; mobile cranes are fixed
• D. There is no difference in work environments or hazards

Answer: (B)

The key idea is how each crane is used and what kinds of hazards come with its usual setup. Overhead cranes are built to operate inside a shop, warehouse, or other facility where they run on fixed rails above the work area. Because the hoist and trolley move beneath or along those rails, people must be mindful of pinch points where moving parts could trap fingers or clothing, and of electrical hazards from the crane’s electrical systems and controls that are overhead. The work area is generally covered and the crane operates within a defined, elevated path, which changes the risk profile to things like overhead moving loads and exposure to energized components.

Mobile cranes, on the other hand, are designed to travel to a job site and lift outdoors or at ground level. They move on wheels and must be set up on stable ground with outriggers for stability, often with traffic control and coordination if they’re near roadways or other work zones. Hazards here include ground instability or soft terrain, the need to manage outriggers and load radius to prevent tipping, wind effects on tall configurations, and the risk of contact with power lines or nearby structures. There’s also the typical lifting hazards such as load swing and rigging failures, but the environment itself shifts the emphasis to ground conditions and on-site traffic rather than overhead components.

So, the best description is that overhead cranes run on rails above work areas with pinch points and electrical hazards, while mobile cranes travel on roads with stable ground and traffic control; both carry their inherent hazards. The other options either oversimplify or misstate where each crane operates and the kinds of hazards involved.