Final answer:
The underground conductors between the service point and the first point of connection to the service-entrance conductors are known as service lateral conductors.
Step-by-step explanation:
The underground conductors referred to in the question are known as service lateral conductors. These are the cables that run from the service point, which typically is the point of connection to the utility's electricity supply, to the first point of connection with the building's electrical system—this could be a terminal box, meter, or other type of enclosure. Service lateral conductors are usually made of copper or aluminum and are designed to carry electrical power from the utility to the customer's service equipment.
These conductors are crucial for the safe and efficient delivery of electricity to a building or residence. They must be adequately protected and appropriately rated for the expected load and environmental conditions they will endure. The installation and specifications for service lateral conductors are governed by local electrical codes and regulations, such as the National Electrical Code (NEC) in the United States.
The characteristics of these conductors allow for safe transmission of electrical power underground, shielding the wires from environmental damage and reducing the risk of electrical hazards.