What type of cable is referred to as service-entrance cable?

Service-entrance cable is specifically designed for providing electrical power from the utility company's power line to the service equipment in a building. This type of cable typically consists of either a single conductor or multiple conductors bundled together in a protective sheath, making it suitable for both residential and light commercial applications. The primary purpose of service-entrance cable is to handle the electrical load required for a structure’s internal electrical system.

In the context of the other options provided, a three-phase power cable is used for large industrial or commercial applications where three-phase power is necessary, rather than for service entrance specifically. Fiber optic cables are utilized for data Transmission, primarily in telecommunications, and do not serve as service entrance cables. Coaxial cables are typically used for television and internet signals, not for power delivery at the entrance of a building. Therefore, the single or multiconductor electrical assembly is the correct description for what a service-entrance cable is, given its role in electrical distribution.