The input voltage of a distribution transformer is typically between 2,400 and 34,500 volts, while the output voltage is usually 120/240 volts for residential customers and 120/208 or 277/480 volts for commercial customers.
For residential customers, the output voltage is typically 120/240 volts in a split-phase system. This means there are two 120-volt lines and a neutral line, allowing for both 120-volt and 240-volt loads. Commercial customers often require 120/208 volts for three-phase power or 277/480 volts for larger loads like industrial equipment.
