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Electrical isolation of the different components of an underground storage system can effectively be achieved by utilizing isolation unions and bushings made of nonconductive material. This approach prevents stray electrical currents from flowing through the system, which is critical in avoiding corrosion and potential failures in the system's components.

Nonconductive materials act as barriers that restrict the flow of electricity, maintaining isolation between different parts of the system, such as pipes and fittings. This is essential in underground storage tanks, particularly when dealing with flammable liquids and the potential for electrical hazards. By keeping components electrically isolated, the integrity of the entire system is enhanced, increasing safety and longevity.

Using copper unions and conductive materials, on the other hand, does not promote electrical isolation. Copper itself is a good conductor and would facilitate the flow of electricity rather than preventing it. Installing additional power supplies is also not relevant for isolation; rather, it introduces more potential pathways for current flow, which contradicts the goal of achieving isolation in the system.