A branch circuit is comprised of those conductors that are between the final overcurrent device that is protecting the circuit, at the origin of the branch circuit, and an outlet or multiple outlets. Outlets could include any type including but not limited to receptacle outlets, lighting outlets, or other. A branch circuit can be a single phase or three phase and could be of low voltage or medium voltage.
Branch-circuit requirements can be found in Article 210 but also in other articles as it may related to such loads as motors and more. Branch circuits begin at that final overcurrent protective device. Check out the scope of Article 210 to understand more about what that article has to offer.
Branch circuits come in all sizes and voltages. A single-line diagram can play an important role in determining if the OCPD being looked at, like those in this image, is the final OCPD that is protecting the circuit. It’s important to be able to identify what is and is not a branch circuit to ensure the correct parts of the national electrical code are being applied. Branch circuits have specific requirements for identification as well as part of 210.5.
Other related areas of the National Electrical Code
210.8 Ground-Fault Circuit-Interrupter Protection for Personnel
Branch Circuit, Appliance. (Appliance Branch Circuit)
Branch Circuit, General-Purpose. (General-Purpose Branch Circuit)
Branch Circuit, Individual. (Individual Branch Circuit)
Branch Circuit, Motor. (Motor Branch Circuit)
Branch Circuit, Multiwire. (Multiwire Branch Circuit)
Branch-Circuit Selection Current (BCSC).
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