The NEC establishes some very important fundamentals that weave their way through the decisionmaking process for an electrical installation. They are presented here in brief form and are covered in detail as required throughout this text. The NEC defines a branch circuit as The circuit conductors between the final overcurrent device protecting the circuit and the outlet(s).* See the next Figure. In the residence discussed in this text, the wiring to wall outlets, the dryer, the range, and so on, are all examples of a branch circuit. The branch circuit is that part of the wiring that runs from the final overcurrent device to the outlet.The rating of the overcurrent device, not the conductor size, determines the rating of the branch circuit. Feeder conductors are circuit conductors between service equipment and the final overcurrent device. The NEC defines a feeder as All circuit conductors between the service equipment, the source of a separately derived system, or other...