What size conductor is typically required for underground services to new homes?

The typical requirement for underground services to new homes involves considering the expected load, voltage drop, and ensuring compliance with the National Electrical Code (NEC) and local regulations. In most cases, a 2/0 aluminum conductor is sufficient to accommodate the service needs of a typical single-family residential installation, providing a good balance between ampacity and physical characteristics.

Using a 2/0 aluminum conductor allows for safe transmission of a substantial amount of current, usually around 150-200 amps, which is generally adequate for modern homes with standard electrical loads, including lighting, HVAC systems, and appliances. Additionally, this size is manageable in terms of installation and provides ease of handling, making it a practical choice for underground installations.

Larger conductor sizes, such as 3/0 and 4/0, would be necessary only for homes with exceptionally high power demands or in special conditions, which are not typical for most residential applications. While 1/0 aluminum conductor could work for smaller service requirements, it may not provide sufficient capacity for future expansion or increased load, which is a consideration for new homes aiming to meet future energy needs.