A feeder line is defined as the set of circuit conductors running between the service equipment, or another source of electrical supply, and the final overcurrent device that protects the branch circuits. Let's take a look at the four most common distribution feeder systems applied nowadays. There are few other variations, but we will stick to the basic ones. These conductors are distinct in that they do not directly supply the end-use load, such as a. A feeder in electrical distribution is a circuit that carries power from a substation to the area where customers need it.