What is the size standard for electrical wire used in US manufactured aircraft?

The size standard for electrical wire used in US manufactured aircraft is based on the American Wire Gauge (AWG). This standardized system was developed in the United States and is widely used for determining the diameter and current-carrying capacity of various types of electrical wires. AWG provides a consistent means of sizing different wire types, making it easier for manufacturers and maintenance personnel to select appropriate wire for various applications within an aircraft.

Using AWG allows for clear communication regarding wire specifications, ensuring safety and reliability in electrical systems. It also helps ensure compatibility across various electrical components and systems in the aircraft, as AWG is the convention established within the US aviation industry.

The other options relate to different standards that are either not applicable to US manufactured aircraft or represent different countries' systems, which may not align with the requirements or practices established in the US aviation sector.