A distribution system consists of all the facilities and equipment connecting a transmission system to the customer’s equipment.
A typical distribution system can consist of:
- Distribution Feeder Circuits
- Protective Equipment
- Primary Circuits
- Distribution Transformers
- Secondary’s, and Services
Most industries need 2,400 to 4,160 volts to run heavy machinery and usually their own substation or substations to reduce the voltage from the transmission line to the desired level for distribution throughout the plant area. They usually require 3-phase lines to power 3-phase motors.
Commercial customers are usually served at distribution voltages, ranging from 14.4 kV to 7.2 kV through a service drop line which leads from a transformer on or near the distribution pole to the customer’s end use structure. They may require 3-phase lines to power 3-phase motors.