what size aluminum wire for 100 amp service

The wire size for a 100 amp service depends on factors such as the distance between the service panel and the electrical load, the surrounding temperature, and the voltage drop. Most 100-amp service panels require #2 AWG wire, which is used when there is significant space between the circuit breaker panel and electrical equipment, such as air conditioners, which is common in large commercial buildings. However, if the distance between the utility and breaker panel is less than 50 feet, #4 AWG wire can be used. For direct burial, #1 AWG aluminum wire is recommended, but never smaller than #2 for ground. The ground wire size for 100 amp service is typically 8 AWG copper grounding wire or 6 AWG aluminum grounding wire.