Gasoline service stations utilize cathodically protected underground tanks for storage, and suffer a particular challenge as the result of the required safety grounding of the tanks. With submersible pumps in metallic contact with the tanks, the cathodic protection system is now connected via the submersible pump grounding conductor to the entire utility grounding system. The result is either inadequate cathodic protection readings or interference with the local utility pipelines, such as a gas distribution company.
DEI can solve this problem through the use of a solid-state decoupler placed in series in the submersible pump grounding conductor.
For more information, see:
Decoupling Electrical Equipment Grounds