Why do you use aluminum wire for outdoor and copper wire for indoor
Because the power of the line is p = UI, the current of the high-voltage line is relatively small, and the toughness of the aluminum wire is better than that of the copper wire. The price is also cheap. As long as the load of the line can be met, there is no need to use copper wire
The conductivity of copper wire is better than that of aluminum wire, the thermal conductivity is better, the safe current is higher than that of aluminum core wire, and the service life is longer. The disadvantage is the high price.