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The minimum size for overhead service drop conductors made of copper is #8 AWG. This requirement is specified in the National Electrical Code (NEC), which sets standards for electrical installations to ensure safety and reliability. The #8 AWG size is necessary to handle the typical load requirements and provide adequate conductivity while also ensuring that the conductors can withstand certain environmental factors, such as weather conditions and physical stress.

Conductors that are too small can lead to overheating and increased resistance, which can pose significant safety hazards, including the risk of electrical fires. Therefore, #8 AWG copper conductors are established as the minimum standard to provide both safety and reliable performance in service drop applications.

In contrast, the other sizes listed (like #6, #10, and #12 AWG) do not meet the minimum requirements set forth by the NEC for overhead service applications, as they would either be too large, therefore unnecessarily overcurrent protective, or too small, potentially compromising safety and functionality. Understanding these requirements is crucial for ensuring compliance with electrical codes and maintaining safe installations.