Which of the following is a common example of fireground hazards?

A common example of fireground hazards is downed power lines. When a fire occurs, the risk of power lines being damaged or fallen increases significantly. These downed lines pose serious dangers, as they can carry live electricity, leading to potential electrocution of firefighters and bystanders. The presence of downed power lines also complicates firefighting efforts, as they can obstruct access to the scene and create unstable working conditions.

While other factors such as excessive personnel on site, weather changes, and inadequate lighting can indeed contribute to hazardous situations during a firefighting operation, they do not represent as direct and immediate a risk as downed power lines. For instance, having too many personnel can create congestion but does not intrinsically pose a life-threatening hazard like live electrical wires do. Weather changes certainly impact fire conditions and safety, but their effects can be more variable and less immediate than those of downed power lines. Inadequate lighting can hinder visibility and create confusion but does not inherently pose the same level of threat as the risk of electrocution from power lines. Therefore, downed power lines are a quintessential example of a clear and present danger on the fireground.