Nate Electrical Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

In most residential settings in the United States, the common voltage level for domestic AC circuits is 120 volts. This standard voltage is typically used for most household appliances and lighting fixtures. The electrical system in residential buildings is generally a split-phase system, providing both 120 volts and 240 volts. While 240 volts is used for larger appliances such as dryers and ovens, 120 volts is prevalent for general-purpose outlets in homes.

The other voltage levels mentioned are less common for residential use. For instance, 60 volts is not standard in domestic wiring; instead, it might be found in specific low-voltage applications. A voltage level of 480 volts is characteristic of industrial settings and commercial equipment, which requires more power and is not suitable for typical household use. Therefore, while there are different voltage levels in the electrical system, 120 volts is the most widespread for everyday domestic applications.