The voltages on the high voltage side are not usable by most customers; they are stepped down to which secondary voltages?

The voltages on the high voltage side are not usable by most customers; they are stepped down to which secondary voltages?

• A. 277/480 volts
• B. 120/208 volts
• C. 120/240 volts with a 120/240 unified service
• D. 120/240 volts

Answer: (D)

The common outcome of stepping down from high voltage for most customers is a 120/240-volt split-phase service. This setup gives two hot legs that provide 120 V to standard outlets and lights, and 240 V between the two legs for heavier appliances like dryers or ranges. The other voltages shown come from different system types: 277/480 V is used for large commercial/industrial lighting and equipment, and 120/208 V is typical for three-phase commercial buildings. Some multi-occupancy arrangements refer to a unified 120/240 service, but the standard residential/small business service you’ll see most often is 120/240 V.

The common outcome of stepping down from high voltage for most customers is a 120/240-volt split-phase service. This setup gives two hot legs that provide 120 V to standard outlets and lights, and 240 V between the two legs for heavier appliances like dryers or ranges. The other voltages shown come from different system types: 277/480 V is used for large commercial/industrial lighting and equipment, and 120/208 V is typical for three-phase commercial buildings. Some multi-occupancy arrangements refer to a unified 120/240 service, but the standard residential/small business service you’ll see most often is 120/240 V.