What is the consequence of using a wire that is too small in an aircraft installation?

Using a wire that is too small in an aircraft installation leads to increased voltage drop. When a wire's diameter is inadequate for the amount of current it carries, resistance within the wire increases. This resistance causes a portion of the electrical energy to be dissipated as heat, resulting in a voltage drop across the wire.

In practical terms, this voltage drop can have several negative effects on an aircraft’s electrical systems. It may lead to insufficient voltage reaching equipment, which can impair functionality or even cause equipment failure. Additionally, the heat generated due to the increased resistance can pose a fire hazard and contribute to further degradation of the wire over time. Therefore, it's crucial to select an appropriately sized wire not just to minimize voltage drop, but also to ensure safe and reliable operation of the aircraft's electrical systems.