Which of the following is an example of a protective barrier that may be required in confined spaces?

A protective shield serves an essential role in protecting workers in confined spaces where they may be exposed to various hazards, such as electrical arcs, flying debris, or chemical splashes. These shields can help create a barrier that minimizes the risk of injury from such dangers. In environments where electrical work is performed, especially those that involve high voltage or energized equipment, protective shields can significantly enhance safety by preventing accidental contact and providing a physical barrier that can deflect harmful forces.

In contrast, while items like safety helmets, rubber gloves, and fire extinguishers are critical components of overall safety and emergency preparedness, they do not function as protective barriers in the same context. Helmets protect the head from falling objects, gloves protect hands from electrical contact and chemicals, and fire extinguishers are essential for fire response but do not provide a barrier against physical hazards like electrical arcs or mechanical impacts. Thus, the specific role of protective shields in offering direct protection against various risks in confined spaces makes them the correct choice.