What voltage is most commonly used for lighting circuits in homes in the United States?

What voltage is most commonly used for lighting circuits in homes in the United States?

• A. 120 V
• B. 240 V
• C. 12 V
• D. 208 V

Answer: (A)

Residential lighting in the United States is designed for about 120 volts. This comes from the common split‑phase service that provides 120 V from each hot leg to neutral, with 240 V available between the two hot legs. Most lighting fixtures and standard outlets are designed to run at 120 V, which makes wiring and devices straightforward and safe for homes. Higher-power appliances like dryers and electric ranges use 240 V, which relies on the two hot legs without needing a neutral for those loads. The 12 V level is used only for specific low‑voltage lighting or lighting through transformers, not as the general home lighting supply. In contrast, 208 V is typical in commercial or multi‑phase systems, not standard residential single‑family homes.

Residential lighting in the United States is designed for about 120 volts. This comes from the common split‑phase service that provides 120 V from each hot leg to neutral, with 240 V available between the two hot legs. Most lighting fixtures and standard outlets are designed to run at 120 V, which makes wiring and devices straightforward and safe for homes. Higher-power appliances like dryers and electric ranges use 240 V, which relies on the two hot legs without needing a neutral for those loads. The 12 V level is used only for specific low‑voltage lighting or lighting through transformers, not as the general home lighting supply. In contrast, 208 V is typical in commercial or multi‑phase systems, not standard residential single‑family homes.