The lightning horn used in rural areas is made of what size copper wire?

The choice of 4 AWG copper wire for a lightning horn used in rural areas is significant due to the wire's appropriate balance between conductivity, strength, and flexibility. This size of wire is adequately thick to efficiently conduct the electrical energy generated by a lightning strike, reducing the risk of overheating and potential damage to the system.

Using a wire size like 4 AWG ensures that the lightning horn can effectively handle high-current flows without significant voltage drop, which is essential for maintaining the performance and safety of the lightning protection system. Additionally, 4 AWG wire offers enough mechanical strength to withstand environmental stresses common in rural areas, such as wind and physical impacts, while still being manageable for installation purposes.

The other options present wires that may not provide the same level of safety and efficiency in lightning protection. Smaller gauges would increase resistance and the likelihood of damage during a strike, while larger gauges, although conductive, may be unnecessarily cumbersome and expensive for such applications. The chosen size thus aligns well with the requirements for outdoor lightning protection, making it the correct option.