What is the Service Entrance Cable?
The service entrance cable (SEC) is the large, heavy-duty cable that runs from the utility's connection point on your house (the weatherhead) down to your electrical meter base, and from the meter base to your main electrical panel. This cable is the main artery of your home's electrical system, carrying all the power from the grid into your house. Because it carries such a heavy electrical load, it is critical that this cable is in good condition and properly sized for your home's needs.
Why Service Entrance Cables Need to be Replaced
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When you upgrade your electrical service to a higher amperage, such as from 100 amps to 200 amps, the existing service entrance cable is often not large enough to handle the increased capacity. An undersized cable can overheat, which is a significant fire hazard. Therefore, a panel upgrade almost always includes the replacement of the service entrance cable with a new one that is appropriately sized for the new service. Additionally, older cables can have deteriorated insulation, which can lead to short circuits and other dangers. Your electrician will inspect the SEC as part of the initial project assessment.
The Process of Replacing the Service Entrance Cable
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Replacing the service entrance cable is a major part of the panel upgrade process and is performed while the power to your home is disconnected by the utility company. The electrician will remove the old cable and install the new, larger-gauge cable. This involves running the cable from the weatherhead (the point where the overhead utility wires attach to your house) down the side of your house to the meter base, and then from the meter base into your home to the new electrical panel. All connections must be made securely and weatherproofed to prevent moisture from entering the system.
Code Requirements for Service Entrance Cables
The National Electrical Code (NEC) has strict requirements for the sizing and installation of service entrance cables. The size of the cable is determined by the amperage of the service and whether the conductors are copper or aluminum. The cable must also be properly supported and protected from physical damage. Your licensed electrician will ensure that the new service entrance cable and its installation are fully compliant with all current codes. This is verified during the final electrical inspection, ensuring your new service is not only powerful but also exceptionally safe.
