What voltage type is not allowed for typical branch circuits in residential settings?

In residential settings, typical branch circuits primarily utilize either 120 volts or 240 volts for powering appliances, lighting, and general usage. These voltage levels are standard within the National Electrical Code (NEC) for residential applications, ensuring safety and compatibility with commonly used devices.

480 volts, however, is classified as a higher voltage level primarily used in industrial and commercial applications. It is not suitable for general residential branch circuits due to the increased risk of electrical shock and the need for specialized equipment and wiring methods to handle such voltages safely. This higher voltage can lead to severe safety hazards, making it impractical and against code for typical home use.

Lower voltages like 12 volts are often used for specific low-voltage applications, such as low-voltage lighting or certain types of electronic devices, but they are not considered standard for branch circuits in a residential setting. Thus, the focus on the voltage types appropriate for branch circuits reinforces the general safety and operational standards outlined in the NEC.