Meter Socket and Service Entrance Explained

Everything between the utility's conductors and your main breaker is the service entrance. It's the part of a house's electrical system homeowners understand least, partly because most of it is outside and partly because nobody should be opening any of it.

It's also the part with a distinctive hazard: most of it is unprotected by any overcurrent device.

Who owns what

The split matters when something breaks: a damaged mast is your electrician's job even though the utility must disconnect to allow it, while a damaged service drop is a call to the utility and usually free. Boundaries vary by utility — confirm yours before assuming.

The path, in order

1. Service drop or service lateral. The utility's conductors — overhead from a pole, or underground from a transformer. Utility-owned. See who owns what on your electrical service.

2. Point of attachment (overhead). Where the drop terminates on your building — typically a bracket or insulator on the mast.

3. Service mast. The conduit or pipe carrying conductors from the attachment point down (or up through the roof). Yours. It has to withstand the mechanical pull of the drop, which is why it's substantial and why storms damage it.

4. Weatherhead (service head). The fitting at the top where conductors enter the mast. Designed to keep water out. Conductors form a drip loop below it so water runs off rather than tracking down the wire and into the conduit.

5. Service entrance conductors. From the weatherhead to the meter socket, and from the meter socket to the service disconnect. Yours.

6. Meter socket. The enclosure the meter plugs into. Yours; the meter is the utility's.

7. Service disconnecting means. The main breaker or main disconnect. This is where overcurrent protection begins and where your premises wiring officially starts.

8. The panel and everything beyond. See what is an electrical panel.

Why does the "unprotected" part matter?

There is no overcurrent device between the utility transformer and your service disconnect. The conductors and equipment in steps 1–6 are protected only by the utility's upstream protection, which is sized for their distribution system, not for your service conductors.

Two practical consequences:

Nobody should open a meter socket. The line-side jaws are energized and stay energized when your main breaker is off. Pulling a meter, breaking a seal, or working in a socket is line-side work — see who owns what on your electrical service.

The code limits how far unprotected conductors run inside a building. Service entrance conductors are required to be kept short inside the structure, and the service disconnect must be at a readily accessible location nearest the point of entrance of the conductors. The specific requirements come from the NEC's service article, and your adopted edition and local amendments govern. This is why panels are commonly on the wall directly behind the meter, or immediately inside it.

Recent code editions also added an emergency disconnect requirement for one- and two-family dwellings — an outside, readily accessible means to disconnect power so first responders don't have to enter the building. See what is a service disconnect.

Inside the meter socket

Conceptually simple: line-side jaws fed by the service entrance conductors from the utility, load-side jaws feeding the panel, and the meter bridging them so all current passes through it to be measured.

Some sockets include a bypass arrangement letting the utility work without interrupting service. Some newer installations combine the socket with a disconnect in one enclosure — a meter-main.

Meter collar adapters are a newer product category that install between the meter and the socket to add a connection point for solar, batteries or EV charging without a panel upgrade. Availability depends on utility approval and product listing — see meter collar adapters explained.

What fails, and what it looks like

Weatherhead and mast:

• Storm damage — a pulled drop tearing the mast from the wall. Utility restores the drop; an electrician repairs the mast, usually with a permit
• Missing or damaged drip loop, letting water track into the conduit
• Corrosion at the fitting
• A leaning or loose mast, which puts strain on everything

Meter socket:

• Rust and corrosion inside the enclosure — the most common finding, and the most consequential, because corroded connections generate heat
• Water staining or a cracked, missing or ill-fitting cover
• Scorch marks or discolouration around the terminals — a serious finding
• The socket pulling away from the wall
• Burning smell — urgent

Service entrance conductors:

• Damaged or degraded insulation, especially where exposed to sun
• Undersized for a service upgrade — a common discovery when people find their "200 amp panel" is fed by conductors sized for less
• Aluminium terminations that were never properly prepared or torqued

That last point connects to a broader issue — see breaker torque and loose connections.

Signs of a service-side problem inside the house

Some symptoms point outside rather than at your panel:

• Lights flickering or dimming throughout the whole house, especially if lights brighten in one area while dimming in another. This can indicate a lost or failing neutral on the service, which can put damaging voltage on 120V equipment. Call the utility urgently. See flickering lights causes
• Half the house dead with no breaker tripped — potentially a lost utility leg
• Buzzing from the meter area — see buzzing electrical sounds
• Voltage that varies noticeably with load

These are worth taking seriously rather than living with.

Service capacity

Your service rating — the amperage the whole installation supports — is limited by the weakest link across the entire path: utility transformer and drop, service entrance conductors, meter socket rating, main disconnect, and panel busbar.

Which is why a panel upgrade isn't always just a panel. Raising the service rating may require new service entrance conductors, a new meter socket, mast work, and utility involvement to confirm the drop and transformer can support it. That's the difference explained in service upgrade vs panel replacement.

Work out what you actually need with the home electrical load calculator and how to do a home electrical load calculation, and see Electrical panel upgrade.

What you can safely do

From the ground, visually:

• Look at the mast and weatherhead — leaning, corroded, drip loop intact?
• Look at the meter socket — rust, cracks, staining, scorch marks, cover secure?
• Check whether vegetation is growing into the service drop. Call the utility to trim it, never do it yourself
• Note the meter socket's rating if it's visible

What you must not do:

• Open the meter socket
• Pull the meter or break the seal
• Touch the mast or weatherhead
• Approach a damaged service drop
• Work anywhere line-side of the main disconnect

See electrical work homeowners can legally do.

The bottom line

The service entrance is everything from the utility's conductors to your main disconnect — mast, weatherhead, service entrance conductors and meter socket — and none of it is protected by an overcurrent device you control. That's why the code keeps unprotected conductors short inside the building and why nobody opens a meter socket. Inspect the visible parts from the ground for rust, cracks, scorching and a leaning mast, and treat whole-house flickering as a possible service neutral problem worth an urgent utility call.

Related: who owns what on your electrical service.