Which of the following systems is considered non-conductive?

Fiber-optic cable systems are considered non-conductive because they use light to transmit data rather than electrical signals. This characteristic makes them inherently safe from electrical surges, including those that can occur during a lightning strike. As a result, fiber-optic cables do not provide a pathway for electrical currents, which protects them from damage and eliminates the risk of electrical shock associated with conductive materials.

In contrast, coaxial cable systems and metal wire systems are conductive, as they are designed to carry electrical signals. They can conduct electricity and may pose risks during electrical surges, making them unsuitable for environments where lightning protection is a primary concern. Thus, fiber-optic cable systems stand out as a reliable non-conductive option for data transmission.