Ace the NHIE 2026 – Unlock Your Home Inspector Superpowers Today!

The standard size of residential electrical service typically falls within the range of 100 to 200 amps, making this the most common capacity for modern homes. A 100-amp service has been the traditional baseline for older homes, providing enough electricity for basic appliances and lighting. However, as energy use increases due to modern conveniences such as multiple electronics, HVAC systems, and larger appliances, the standard has shifted toward a 200-amp service. This increase allows for greater capacity to accommodate additional load without risk of overloading the system.

In essence, a 200-amp service is now considered the norm for new construction, providing a sufficient safety margin and adequate power supply for contemporary living standards. Therefore, the correct answer reflects the current residential electrical service size that balances historical practices with the needs of modern lifestyles.