Umair Gaines
A service entrance is the point at which electricity enters a building. It involves a service entrance conductor (SEC), which connects the electrical line from the utility company to the service line at a residence. The service entrance includes the electric meter that measures the amount of energy delivered and the service panel that houses the circuit breakers or fuses and distributes power to the various circuits in the house. The service entrance ensures electricity runs into the building safely and efficiently.
| Characteristics | Values |
|---|---|
| Purpose | Point at which the electrical line from the utility company meets the service line at a residence. |
| Function | Ensures electricity runs into the residence safely and efficiently. |
| Components | Electric Meter, Service Panel, Main Disconnect, Circuit Breakers or Fuses. |
| Meter Function | Measures the amount of energy delivered to the residence. |
| Service Panel Function | Houses the circuit breakers or fuses and distributes power to the various circuits in the residence. |
| Main Disconnect Function | Disconnects the electrical power feed in case of an emergency. |
| Types | Overhead, Buried |
| Overhead Service Entrance Location | Found in urban areas, older homes and neighbourhoods. |
| Buried Service Entrance Location | Found in rural locations, modern settings. |
| Overhead Service Entrance Height | Over 10 ft. above walking surfaces. |
| Overhead Service Drop Types | Mast, Clevis |
| Service Cable Types | SER, SEU |
| SER Cable | Copper or aluminium wires reinforced with Style R tape. |
| SEU Cable | Style U, unarmoured, used as panel feeders. |
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What You'll Learn
Service Entrance Conductors (SEC)
There are two main types of SEC: overhead and buried. Overhead SECs are more common in urban areas and older neighbourhoods, where power lines are often visible. They are also more accessible for inspection, which is crucial for safety. Conversely, buried lines are typically found in rural locations and are preferred in modern settings, as they are less obtrusive.
When inspecting an SEC, there are several key aspects to evaluate. Firstly, the height of the service drop clearance must be adequate, with a minimum of 12 feet above the driveway and 10 feet above walkways. Secondly, the wall anchor condition must be secure and in good repair. Thirdly, the wiring itself must be free of any damage or fraying. The service mast condition and drip loop are also crucial components of the SEC configuration. The service mast guides the electrical wiring from overhead to the meter, protecting high-voltage currents, so any damage to this component could be hazardous. The drip loop is a dip in the service line that prevents moisture from entering the service mast and causing issues such as corrosion or short circuits.
Inspectors will also consider the amperage entering the home and whether it meets the homeowner's energy demands. If not, an update to the SEC and main panel may be required. Additionally, inspectors will assess the proximity of trees and vegetation, as contact with the SEC can cause fraying and damage over time.
Overall, SECs play a critical role in ensuring electricity enters our homes safely and efficiently, and regular inspections are necessary to maintain this vital infrastructure.
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Service Entrance Cables
There are two main types of service entrance cables: SER and SEU. SER cables are copper or aluminium wires reinforced with Style R tape, and they typically deliver power from the service drop-down to the meter base and then to the distribution panel. SEU cables, on the other hand, are Style U, meaning they are unarmoured and often used as panel feeders in branch circuit applications. They have a neutral conductor but lack a ground conductor.
The installation of service entrance cables should always be done by a qualified professional due to safety concerns. Inspectors play a crucial role in evaluating the service entrance conductors and ensuring they meet the required standards. They check aspects such as amperage, the service mast condition, the drip loop, and grounding rods to ensure safe and efficient electricity supply to residences.
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Service Drop
An electric service drop is the main connection between the power pole of the electric utility company and a residence. It is a bundle of cables that run from the pole to the property, and because the power company lines are higher than residential properties, the cables have to drop to reach the home, hence the name.
A standard service drop consists of three cables, or conductors. Two of these are insulated "hot" cables, each carrying 120 volts of electricity. The third is a neutral conductor, typically made of bare aluminium, which offers structural support for the entire service drop. The service drop provides the building with two 120 V lines of opposite phase, so 240 V can be obtained by connecting a load between the two 120 V conductors. 240 V circuits are used for high-demand devices, such as air conditioners, water heaters, and ovens. 120 V circuits are used for lighter loads such as lighting.
In some cases, service drops are supplied by underground cables, which are referred to as a service lateral. Underground cables are becoming more common in new constructions as they are less vulnerable to weather conditions and are not visible, reducing the danger of accidental contact. However, there is a risk of them being struck by construction or repair crews, and they are more expensive and labour-intensive to install and repair.
Overhead service drops are more common in older homes and neighbourhoods, and in urban areas where many overhead power lines are present. They are also more accessible for evaluation by home inspectors. Local building and electrical codes dictate the minimum height requirements for service drop cables, with the National Electrical Code providing recommendations. The height requirements are usually 12 feet above the ground for service drops, 10 feet for decks and porches, 22 ½ feet for swimming pools, and 18 feet for public roads.
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Service Lateral
A service lateral is an underground power line that connects a utility's electric supply system to a building's service entrance box. It is an essential component of electrical distribution systems, providing a dedicated connection between the electrical supply source and the end-user's premises.
The NEC also specifies that each service lateral shall supply only one set of service entrance conductors. This means that if there are multiple buildings, each with separate meters, they would require individual service laterals. However, if the metering point is moved to a central location, the conductors from this connector to each building would be considered service entrance conductors, and the requirement for separate service laterals would be met.
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Service Meter
A service meter is a crucial component of the service entrance, which is the point at which electricity enters a residence. The service meter, also known as an electric meter, electrical meter, or kilowatt-hour meter, measures the amount of electrical energy consumed by a residence, business, or electrically powered device over a specific period. This measurement is typically in billing units, most commonly the kilowatt-hour (kWh).
Electric utilities use service meters for billing and monitoring purposes, usually reading the meter once per billing cycle. Some meters can also measure demand, or the maximum power usage during a specific interval, which is useful for tracking energy savings during certain periods. "Time of day" metering is another feature of some meters, allowing electric rates to be adjusted throughout the day to record usage during peak and off-peak periods.
The placement of service meters can vary. In North America, it is common for meters to plug into a standardized socket outdoors, on the side of a building, allowing for easy replacement. In other cases, meters may be located outside on a utility pole or inside the building, either in a niche or sharing a data connection with other meters.
Inspectors play an important role in evaluating service meters and the associated components. They assess the amperage entering the home, the condition of the service mast (the conduit guiding wiring from overhead to the meter), and the service lateral riser, ensuring no damage to wiring or gaps in conduit.
Overall, the service meter is an essential device for measuring and monitoring electricity consumption, enabling billing and energy management for residences and businesses alike.
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