Which voltage configuration is a typical split-phase system?

Which voltage configuration is a typical split-phase system?

• A. 120/240 V.
• B. 208Y/120 V.
• C. 240/347 V.
• D. 600/347 V.

Answer: (A)

Split-phase systems use a center-tapped transformer to create two hot legs that are 180 degrees out of phase. Each leg provides 120 volts to a common neutral, so the voltage between the two hot legs is 240 volts. This is exactly how residential service is typically supplied in the United States, making 120/240 V the standard split-phase configuration. The other voltages describe different three-phase arrangements: 208Y/120 V is a three-phase wye with 120 V to neutral and 208 V between phases; 347/600 V is another common three-phase setup with 347 V to neutral and 600 V between phases; and 240/347 V isn’t a standard split-phase description. So the configuration that represents a typical split-phase system is 120/240 V.

Split-phase systems use a center-tapped transformer to create two hot legs that are 180 degrees out of phase. Each leg provides 120 volts to a common neutral, so the voltage between the two hot legs is 240 volts. This is exactly how residential service is typically supplied in the United States, making 120/240 V the standard split-phase configuration. The other voltages describe different three-phase arrangements: 208Y/120 V is a three-phase wye with 120 V to neutral and 208 V between phases; 347/600 V is another common three-phase setup with 347 V to neutral and 600 V between phases; and 240/347 V isn’t a standard split-phase description. So the configuration that represents a typical split-phase system is 120/240 V.