For underground services to new homes, what size aluminum conductor is typically installed to deliver 200 amps?

For underground services to new homes, the typical size of aluminum conductor installed to deliver 200 amps is 2/0 aluminum conductor. This size is commonly specified because it can safely handle the current load required for residential service.

Aluminum conductors are rated based on their gauge, and 2/0 (two aught) aluminum is recognized for its conductivity and ability to manage the heat generated by electrical current. When you're considering factors such as the distance the conductor needs to run and potential voltage drop, 2/0 aluminum typically provides a good balance of performance and efficiency for the 200 amp service.

Larger sizes like 3/0 and 4/0 would exceed the requirements for a standard 200 amp service and could represent unnecessary expense and weight, while a 1/0 aluminum conductor would be insufficient to handle the full load safely under typical conditions. Therefore, 2/0 aluminum conductor is the standard size suited for this application, ensuring that residential services operate safely and effectively.