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In lightning protection systems, copper is the material most widely used for conducting cables due to its excellent conductivity and ability to efficiently carry electrical currents. Copper has a high degree of electrical conductivity, which means it allows electricity to pass through it with very little resistance. This is crucial during a lightning strike, where the goal is to safely channel the electrical energy into the ground without causing damage to the protected structure.

Additionally, copper is highly resistant to corrosion, which is important since conducting cables are often exposed to outdoor elements. This durability ensures a long-lasting solution in lightning protection systems. While aluminum, steel, and plastic can be materials used in various applications, they do not offer the same combination of conductivity and resistance to environmental factors as copper does, making copper the preferred choice for these systems.