As the length of an electrical run increases, what may be necessary?

Increasing the wire size becomes necessary as the length of an electrical run increases primarily due to voltage drop considerations. When electricity travels through a conductor, resistance causes a reduction in voltage, particularly over long distances. This voltage drop can lead to inefficiencies and potentially inadequate performance of electrical devices.

Using a larger wire size decreases resistance, which helps to maintain an acceptable level of voltage at the load end of the circuit. It also allows for a greater current-carrying capacity, thereby minimizing heat generation and the risk of overheating.

While other choices might seem relevant, they do not directly address the fundamental issue of impedance related to longer runs. For example, using a different type of conductor may not necessarily reduce the voltage drop unless it has a significantly lower resistivity, and adjusting fuse sizes without addressing wire gauge could lead to circuit overloads or safety hazards. Therefore, increasing the wire size is the most effective solution to ensure reliable and safe electrical performance over extended distances.