Utilities provide residential power with what voltage and phase configuration?

• A. 120v, single phase, two wire
• B. 480v, three phase, three wire
• C. 208v, single phase, two wire
• D. 240v, single phase, three wire

Answer: (D)

Residential power is provided as a split-phase single-phase service. It uses two hot conductors that are opposite in phase, plus a neutral. Each hot is 120 volts to neutral, and the voltage between the two hot legs is 240 volts. This setup creates a three-wire service (two hots and a neutral), which powers both 120 V and 240 V loads in homes. The other options describe systems not typical for residential service: higher-voltage or three-phase arrangements used in commercial/industrial settings, or a simple 120 V two-wire setup without the 240 V capability. So the standard residential configuration is 240 V, single-phase, three-wire.