What is the typical residential voltage configuration in North Carolina?

• A. 277/480 volts, three-phase
• B. 120/208 volts, single phase
• C. 120/240 volts, single phase, three-wire grounded neutral system
• D. 240/480 volts, single phase

Answer: (C)

In North Carolina, the typical residential voltage configuration is indeed a 120/240 volts, single phase, three-wire grounded neutral system. This configuration is standard for most residential homes and is designed to meet the energy needs of household appliances and lighting.

The 120/240 volts system provides two different voltages: 120 volts for standard outlets and smaller appliances, and 240 volts for larger appliances such as dryers, ovens, and HVAC equipment. The three-wire setup includes two hot wires and one neutral wire, which allows for a balanced load and enhances safety by providing a grounded neutral.

Using this configuration also helps to maximize efficiency by allowing appliances to operate effectively at both voltage levels. It supports the diverse energy requirements of a modern household, making it the most practical and widely adopted system for residential use in North Carolina.