Safety Trained Supervisor in Construction (STSC) Practice Exam 2025 - Free STSC Practice Questions and Study Guide

The best protection while working with a drill and a 25-foot extension cord is GFCI protection. Ground Fault Circuit Interrupters (GFCIs) are designed to protect against electrical shock by monitoring the electrical current flowing through the circuit. If there is an imbalance, indicating that some current is leaking towards the ground (potentially through a person), the GFCI quickly shuts off the power, minimizing the risk of severe injury or fatality.

This form of protection is critical when using electrical tools, especially in environments where moisture is present, as this can increase the risk of electrical shock. Using a GFCI is a standard safety practice on job sites to ensure the safety of workers operating power tools.

While other options may provide some level of protection, they do not address the risk of electrical shock in the same effective manner. For instance, rubber gloves can provide insulation from electricity, but they need to be rated for electrical work and may not be practical or comfortable for all tasks. Plastic coverings and electrical tape may help with insulation or securing cords, but they do not actively prevent shock hazards. GFCI protection directly tackles the root cause of potential electrical accidents, making it the most appropriate choice for safety while using power tools in construction.