What Is the Input and Output Voltage of a Distribution Transformer

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.

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