Final answer:
The hazard present is contacting energized sources due to the risk of electric shock from a metal shelf in contact with a bare wire on a freshly mopped floor. Protective systems such as plastic insulation, circuit breakers, and GFCIs are crucial in preventing such hazards.
Step-by-step explanation:
In the scenario described, the hazard present is contacting energized sources. The worker is at risk of an electric shock since they are standing on a conductive surface (a wet floor) and adjusting products on a metal shelf with which there is a potential electrical hazard due to a bare wire in contact with the shelf. If the wire is live, electricity may flow through the worker's body, leading to serious injury or even death. This is different from thermal hazards, where excessive electric power causes undesired thermal effects like fire, or from issues with improper use of cords which can also pose electrical hazards but are not directly related to the situation described.
Shock hazards are particularly dangerous when wet conditions, like a freshly mopped floor, are involved. Wet conditions significantly reduce the resistance of human skin, enhancing the likelihood and severity of an electric shock. Protective systems like plastic insulation on live wires, circuit breakers, and ground fault circuit interrupters (GFCIs) are essential to prevent such hazards. These safety systems are designed to detect abnormal flow of electricity and disconnect the power before injury or damage may occur. Employing safe practices and using the appropriate protective equipment are also critical in avoiding electrical accidents in the workplace.