Who owns the meter base?

The homeowner typically owns the meter base and the wiring on the house side. The utility owns the meter itself and the wiring on the supply side of the meter. Requirements vary by utility, so checking with the local provider is recommended.

Can I upgrade my meter base myself?

No. The meter base connects directly to the utility supply and is always energized until the utility disconnects it. A licensed electrician must perform the work and coordinate a temporary disconnect with the utility company.

How do I know if my meter base is failing?

Rust holes, burn marks around the meter, a meter that sits loosely, buzzing sounds, or flickering lights throughout the house can indicate a failing meter base or deteriorated jaw contacts inside.

What size meter base do I need for a 200-amp service?

A 200-amp rated meter base matched to the utility's meter type is required. The electrician and utility company coordinate to ensure the base, meter, and service conductors are all rated for the same amperage.

Does replacing a meter base require a permit?

Yes. Meter base replacement is part of the service entrance and always requires an electrical permit, inspection, and utility coordination for disconnection and reconnection.

Meter Base — Exterior Utility Meter Enclosure Explained

A meter base is a weatherproof enclosure mounted on the exterior of a building that houses the electric utility meter and connects the service entrance conductors to the utility supply.

Meter Base diagram — labeled parts and installation context

What It Is

The meter base is the transition point between the utility company's wiring and the homeowner's electrical system. Service conductors from the utility enter through the top, pass through the meter socket jaws, and exit through the bottom to the main panel. The meter itself plugs into spring-loaded jaws inside the base and is sealed by the utility with a tamper tag or locking ring.

Because it is always energized whenever the utility is connected, the meter base is one of the most critical and most hazardous components of the residential electrical system. Only the utility company or a licensed electrician coordinating with the utility should work on it. The line side of the meter base carries the full available fault current from the utility transformer, which can exceed 10,000 amps, making accidental contact potentially fatal.

Meter bases are manufactured from galvanized steel or aluminum and are rated by NEMA for outdoor exposure. The enclosure must be weatherproof when the meter is seated and the cover is closed, preventing rain, insects, and debris from reaching the internal connections. Most residential meter bases are rated for 100-amp, 150-amp, or 200-amp service and must match the rating of the service entrance conductors and the main panel.

Types

Single-meter bases serve one dwelling unit and are the standard for single-family homes. Gang meter bases hold two to six meters side by side for duplexes, triplexes, and small multifamily buildings, with each meter serving a separate dwelling unit or tenant space. Combination meter bases, sometimes called meter-main units, integrate the main disconnect or panel directly below the meter socket in a single enclosure, eliminating the need for a separate main panel inside the home.

Overhead-fed meter bases have a service entrance cap or weather head at the top where the utility service drop connects. Underground-fed bases have a conduit entry at the bottom for the utility lateral coming up from below grade. The choice depends on whether the utility provides overhead or underground service in that area.

Where It Is Used

The meter base is mounted on an exterior wall, typically near the point where the service drop or lateral reaches the building. It is usually on the side of the house closest to the utility pole or underground transformer, positioned between 4 and 6 feet above finished grade for easy meter reading and utility access. The NEC and local utility specifications dictate the exact mounting height, clearances from windows and doors, and distance from gas meters.

In commercial buildings and multifamily properties, ganged meter bases may be mounted on a dedicated meter pedestal or meter room wall where all tenant meters are grouped together for utility access.

How to Identify One

Look for a gray metal box on the exterior wall with the round glass-faced or digital utility meter plugged into its center. A thick conduit or service entrance cable enters from the top and another exits from the bottom toward the main panel. The utility's tamper seal or locking ring secures the meter in place. A label on the enclosure identifies the manufacturer, amperage rating, and catalog number.

Older meter bases may show signs of age including rust stains running down the siding, a loose-fitting meter, or faded and corroded enclosure paint. The area around the meter base is usually free of vegetation per utility requirements.

Replacement

Replacement is needed when the enclosure is rusted through, the jaw contacts are burned or loose, the meter does not seat properly, or the service is being upgraded to a higher amperage. A 100-amp to 200-amp service upgrade, one of the most common residential electrical projects, almost always requires a new meter base sized for the larger conductors. Coordination with the utility is required to disconnect and reconnect power, and an electrical permit and inspection are always required before the utility will release the meter and restore service.