Which device is essential for preventing electrical overload on site?

The essential device for preventing electrical overload on site is a ground fault circuit interrupter (GFCI). This device is designed to protect against electrical shocks and overloads by monitoring current flow through electrical circuits. If the GFCI detects an imbalance between the outgoing and incoming current, which can happen if there is a ground fault or overload, it quickly interrupts the circuit. This immediate disconnection helps to prevent electrical fires and reduces the risk of severe electric shock, making it crucial in areas where electricity and moisture can come into contact, such as construction sites.

While a fuse box does play a role in protecting against overload by breaking the circuit when the current exceeds a certain level, it does not provide the same level of protection against ground faults specifically. A voltage regulator ensures that voltage levels remain consistent but does not directly prevent overload situations. Lastly, a power inverter is used to convert direct current (DC) to alternating current (AC) and does not relate to overload protection. Thus, the ground fault circuit interrupter is the most effective choice in preventing electrical overload on site.