Which of the following is NOT a method of protecting against overload in an electrical circuit?

Using larger gauge wiring is not a method specifically aimed at protecting against overload in an electrical circuit. In fact, larger gauge wiring is generally used to handle higher currents and reduce resistance, which can be beneficial for preventing overheating and potential overload issues. While it is important to use the correct wire gauge for the application, simply increasing the gauge does not provide an active mechanism for overload protection.

In contrast, circuit breakers and fuses are designed specifically to interrupt the circuit when current exceeds a certain threshold, effectively protecting against overload conditions. Ground fault devices are also safety devices that disconnect the circuit when they detect an imbalance in electrical current, which can occur due to faults that might lead to overload situations.

In summary, while using larger gauge wiring can enhance the safety and efficiency of electrical installations, it does not serve the primary function of protecting against overload, which is why it is the correct choice in this context.