Distribution transformers reduce the voltage of the primary circuit to the voltage required by customers. This voltage varies and is usually:
- 120/240 volts single phase for residential customers,
- 480Y/277 or 208Y/120 for commercial or light industry customers.
Network service can be provided for areas with large concentrations of businesses. These are usually transformers installed in an underground vault. Power is then sent via underground cables to the separate customers.
 Figure 1. Air Distribution transformer - commercial facility  Figure 2. Industrial facility distribution transformer |
 Figure 3. Residential distribution transformer  Figure 4. Pad-mounted residential distribution transformer |
