Which system involves the overhead delivery of electric energy?

The choice that identifies the system involving the overhead delivery of electric energy is the option that specifies "Overhead Service Conductors." This term directly refers to conductors that are used to deliver electricity from the utility company's distribution system to the service point of a building or structure via overhead lines.

Overhead service conductors are typically suspended from poles or other structures and provide a clear visual identification of a power supply method that is above ground. This type of system is commonly used in residential and commercial applications where underground systems may not be practical or cost-effective.

In contrast, the other options pertain to different aspects of electrical systems. For example, a separately derived system refers to an arrangement where a system establishes a separate source of electrical power, but does not specifically indicate overhead delivery. Service conductors is a broader term that encompasses all conductors supplying electric energy to the premises but does not specify the delivery method as being overhead. Similarly, service-entrance conductors refer to the conductors that connect the service point to the main distribution panel within a building, again lacking the overhead specificity.

Thus, the term "Overhead Service Conductors" is the most accurate representation of the system that involves the overhead delivery of electric energy.