What device must be used in conjunction with a generator to ensure safety from electrical faults?

A transfer switch is essential when using a generator to maintain safety from electrical faults. This device serves as an intermediary that safely disconnects the home or facility's electrical system from the utility power supply while allowing the generator to connect to the load. By doing so, it prevents backfeeding into the utility lines, which can pose serious risks to utility workers repairing electrical lines and can also protect the generator and the electrical system of the building from potential hazards.

Furthermore, transfer switches are designed to ensure that only one source of power is connected to the electrical system at any given time, greatly reducing the risk of overloads and electrical faults. This makes them crucial for safe and effective generator operation, especially in emergency or backup situations where reliable power is needed.

Other devices such as a fuse box or power strip do not provide the necessary isolation and safety mechanisms required when switching between power sources. A surge protector can help protect equipment from voltage spikes but does not manage the connection and disconnection of power sources like a transfer switch does. Hence, the use of a transfer switch is the proper safety measure in conjunction with a generator.