Cathodic protection, proven by decades of service in a variety of applications, prevents corrosion of buried or submerged metallic structures.
Cathodic protection is most efficiently and uniformly applied when the primary structure is electrically isolated – (i.e., all metallic/electrical contacts with foreign metallic structures are eliminated).
Electrical isolation provides three major benefits:

• Restriction of the required protective current to the surface of the primary structure to produce a uniform polarized level of protection.
• Minimization of stray DC current interference.
• Prevention of galvanic current between metallic structures.