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Electricalaka: breaker panelaka: fuse box

Load Center

In Plain English

The residential version of an electrical panel — the box that holds all the circuit breakers in a home.

Definition

A residential-grade electrical panel that receives power from the utility service and distributes it to individual branch circuits through circuit breakers. Load centers are rated by amperage capacity (typically 100A, 150A, or 200A for residential) and by the number of circuits (spaces) they provide. The term is often used interchangeably with breaker panel.

Why It Matters in Bidding

The load center is a defining cost item in residential electrical bids because its amperage rating and circuit count cascade into service entrance conductors, the meter, grounding, and the panel schedule. Estimators must match the panel to the connected load and circuit count on the plans, since an undersized panel triggers change orders and an oversized one inflates the bid.

Example

Bidding a single-family home, an electrician prices a 200A main-breaker load center with 40 spaces, then adds the service conductors, ground rods, and breakers needed to fill the panel schedule on the drawings.

Related Terms

Breaker PanelElectrical PanelCircuit BreakerService Entrance

Frequently Asked Questions

A load center is a residential or light-commercial grade enclosure with circuit breakers, while a panelboard is a heavier commercial-grade distribution panel with higher ratings, bolt-on breakers, and broader configuration options. Estimators price them differently because panelboards cost more and carry longer lead times than off-the-shelf load centers.
Match the panel amperage to the service size and the calculated load on the plans, then confirm the number of spaces covers every branch circuit plus spares. Standard residential ratings are 100A, 150A, and 200A. Verify the panel schedule so the breaker count and circuit types are fully carried.
Not always. Load centers are often sold as the enclosure with a main breaker, while branch breakers may be priced separately. When taking off the bid, count and price each breaker from the panel schedule, since a fully loaded panel can add meaningfully to the material line.

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