For a 100A-rated service, what is the minimum size THW service conductor using aluminum?

To determine the minimum size of an aluminum service conductor for a 100A-rated service, it's important to refer to the National Electrical Code (NEC) guidelines regarding conductor sizing. According to NEC tables, specifically Table 310.16, for aluminum conductors, the minimum size required to safely carry a 100A load is 2 AWG.

Aluminum conductors have different ampacity ratings compared to copper conductors, necessitating larger sizes for equivalent current-carrying capacities. The ampacity for 2 AWG aluminum conductors is adequate to handle the demand of a 100A service without overheating, ensuring safety and efficiency.

Using larger sizes, such as 2/0 AWG or 4/0 AWG, would exceed the minimum requirement but are not necessary for meeting the demand of a 100A service. Smaller sizes wouldn't provide sufficient capacity, which could lead to overheating and possible hazards. Thus, 2 AWG aluminum conductors effectively balance safety and compliance with code requirements for a 100A service.