Question

What are the typical secondary distribution voltages in the United States.

Short answer

The distribution voltages are 208 Y/120 and 480/277 V.

Step-by-step solution

Define secondary distribution voltage.

The secondary distribution voltage is defined as the voltage that is supplied to the small consumers like in household or small buildings.The secondary distribution transmission line includes three wires and 1 neutral. For large load power is taken between three phase and the neutral. For the small load the power is takenbetween one of the phase and the load.

Determine the secondary distribution voltage.

The secondary distribution system of the United States are 208 V for the line to line voltage and 120 V for the line to neutral. The other distribution includes 480 V for the line to line and 277 V for the line to neutral.

Therefore, the distribution voltages are 208 Y/120 and 480/277 V.