Dielectric unions may be used if installed in which area?

Dielectric unions are specifically designed to prevent galvanic corrosion between dissimilar metals, commonly in plumbing systems. The importance of their installation in a readily accessible area is tied to maintenance and repair needs. Accessibility allows for easier inspection, replacement, or repair of the union if issues arise, which is critical for maintaining the integrity of the plumbing system.

When dielectric unions are installed in areas that are not readily accessible, it can pose a challenge if future maintenance is required, potentially leading to increased costs and complications. Thus, the correct answer emphasizes the necessity of ensuring that dielectric unions are installed in locations where they can easily be reached and serviced as needed, highlighting the importance of accessibility in plumbing practices.