What is the main purpose of using a dielectric union in plumbing?

The primary purpose of using a dielectric union in plumbing is to prevent corrosion between dissimilar metals. When two different types of metals are joined together in plumbing systems, such as copper and galvanized steel, an electrochemical reaction can occur, leading to galvanic corrosion. This corrosion can deteriorate the materials over time and result in leaks or failures in the plumbing system.

Dielectric unions are specifically designed to prevent this issue by providing a non-conductive barrier between the two metals. This barrier reduces the electrical connection that promotes corrosion, thereby extending the lifespan of the plumbing components involved. By ensuring that dissimilar metals do not directly interact, dielectric unions play a crucial role in maintaining the integrity of plumbing systems and preventing costly repairs.

The other options do not accurately reflect the main function of a dielectric union. For instance, while grounding connections and electrical isolation are important in electrical systems, dielectric unions are not primarily used for these purposes. Similarly, bonding hot and cold water pipes is not relevant to the function of dielectric unions, as this bonding typically involves ensuring equal electrical potential between pipes rather than preventing corrosion.