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A branch circuit is the circuit conductors between the final overcurrent device (breaker/fuse) and the load(s). A feeder is the circuit conductors between the service equipment or source of separately derived system and the final branch-circuit overcurrent device (i.e., it “feeds” a panelboard/distribution point).
In plain terms: feeder = supply to a panel; branch circuit = supply from a breaker to lights/receptacles/equipment.
Why it matters: sizing, protection, ampacity, voltage drop, and labeling rules are often tested differently for feeders vs branch circuits.
Worked example (quick): Main panel → 60A breaker → subpanel: those conductors are a feeder. Subpanel → 20A breaker → receptacles: those conductors are a branch circuit.
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