What is the minimum ampacity for underground services installed with 2/0 aluminum conductor for new homes?

The minimum ampacity for underground services installed with 2/0 aluminum conductor for new homes is 200 amps. This is primarily based on the National Electrical Code (NEC) standards, which set specific requirements for conductor sizes and their corresponding ampacities.

Aluminum conductors have specific ratings that are generally lower than those of copper conductors for the same size, but 2/0 aluminum is rated to carry sufficient current to support a typical new home’s electrical needs, which often include multiple circuits for lighting, appliances, and HVAC systems. An ampacity of 200 amps is widely recognized as a baseline capacity for residential service, ensuring that the electrical system has adequate power for common usage without exceeding safety limits or causing overheating.

Choosing this ampacity also reflects current practices and anticipates future electrical demands that new homeowners may encounter, such as the increased use of technology and electric vehicles. By ensuring the underground service is rated for 200 amps, it promotes electrical safety and allows for potential upgrades in the future without the need to rewire or replace the conductor.