A worker merely wearing a helmet while handling overhead installations is primarily protected from?

The selection of the option highlighting protection from falling objects is accurate because wearing a helmet is specifically designed to safeguard the head from potential impacts. In environments where overhead installations are being managed, there is a significant risk of tools, equipment, or materials falling from above. The helmet acts as a barrier, preventing serious injuries that could result from such incidents.

In contrast, while handling electrical installations might raise concerns about electrical shock, a helmet does not provide electrical insulation, which is why other protective gear such as insulated gloves or special suits is necessary for that type of risk. Similarly, chemical splashes require appropriate face shields or goggles to protect the eyes and skin, and heat exposure necessitates different clothing designed to manage high temperatures. Therefore, the primary and most relevant protection offered by a helmet in this scenario pertains to defense against falling objects.