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Electricalaka: circuit

Branch Circuit

In Plain English

A single circuit that runs from your breaker panel to the outlets or lights in a specific area of the building.

Definition

The portion of a wiring system that extends beyond the final overcurrent protection device to outlets, fixtures, and equipment. Branch circuits originate at the electrical panel and serve individual loads or groups of loads within a building. The NEC defines several types including general-purpose, small-appliance, individual, and multi-wire branch circuits.

Why It Matters in Bidding

Branch circuit counts drive a large share of an electrical estimate because each one carries wire, conduit, devices, terminations, and labor that compound across a building. Estimators tally home runs and device counts from the panel schedules and floor plans, and miscounting circuits or mis-sizing the wire directly skews both material and the largest line item, labor.

Example

An electrical estimator counts 42 general-purpose and small-appliance branch circuits off the panel schedule, then prices the home-run footage and device terminations to build the labor units for the rough-in portion of the bid.

Related Terms

Electrical PanelCircuit BreakerReceptacleNEC (National Electrical Code)

Frequently Asked Questions

Estimators work from the panel schedules and floor plans, counting each home run from the panel plus the devices, fixtures, and equipment it serves. Each circuit generates wire footage, conduit, boxes, and terminations that get assigned labor units. Multi-wire and dedicated circuits are tracked separately because they affect wire and breaker sizing.
Wire gauge and length, conduit type and routing difficulty, device and fixture count, and termination labor all drive cost. Longer home runs, larger conductors for voltage drop, and concealed or overhead routing raise both material and the labor units, which usually dominate the circuit's price.
A dedicated or individual branch circuit serves a single load, so it requires its own home run, breaker, and conductor run rather than sharing with other outlets. That means more wire, more panel space, and additional labor per device served, raising the cost compared with general-purpose circuits feeding multiple outlets.

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