What Is a Service Entrance?
A service entrance is the electrical equipment that brings utility power into a building and connects it to the main electrical system. It includes the service wires and associated equipment that carry power toward the main disconnect. The exact arrangement depends on how the utility supplies the building. For more detail, see Flickering Lights in Your House: Electrical Causes and Warning Signs.
Quick Facts About Service Entrance
- Category
- Incoming electrical service equipment
- Used for
- Supplying the building's electrical system
- Common confusion
- Service mast versus service entrance
- Often discussed with
- Service Entrance Repair, Meter Socket Replacement
Key Takeaways About Service Entrance
- Service entrance equipment serves the whole building.
- Damaged cable covering may need repair.
- A service mast is just one possible part.
How Service Entrance Works

A service entrance carries incoming electricity along a path to the building's electrical system. The path can run overhead or underground. Its visible parts depend on the route and the equipment at the building.
Related glossary terms: Service Mast, Meter Socket, Main Breaker.
For an overhead supply, a service mast may support the incoming wires above the roof. A weatherhead covers the opening where wires enter the mast. An underground supply follows a different path and doesn't need an overhead mast.
The incoming power passes through a meter that records electricity use. From there, it reaches a main disconnect that can shut off power to the building's electrical system. The panel then distributes power to branch circuits that serve outlets, lights and other equipment.

From the Electrician Pittsburgh team
When we assess a service entrance for repair, we look for damage along the visible cable and its fittings. We also check where the equipment meets the building. The repair approach depends on which parts show damage and how the supply reaches the property.
Service Entrance in Practice: A Real-World Example
A Pittsburgh homeowner notices frayed covering on the service cable outside the house. A service entrance repair assessment identifies the affected cable and determines what work the connection needs.
Related Services
Related Terms
Service Mast
A service mast is a rigid pipe that carries overhead electrical service wires into a building.
Meter Socket
A meter socket is an electrical fitting that holds an electric meter and connects it to the service wiring.
Main Breaker
A main breaker is a protective switch that controls power to an electrical panel.
Branch Circuit
A branch circuit is an electrical path that carries power from a final circuit breaker or fuse to outlets and equipment.
Electrician Pittsburgh
Have Questions About Service Entrance?
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