Safe Rectifier Design for Cathodic Protection

Abstract Rectifier safety has recently become an industry concern for cathodic protection technicians and personnel who are responsible for rectifier operation, maintenance and repair. While rectifiers are manufactured according to national electrical codes and standards and inspected by authorities such as UL(1) or CSA(2); the basic rectifier designs have not changed significantly over the past 25 years in regards to safety. Rectifier manufacturers have been prompted by cathodic protection personnel and owner/operator companies to address the safety concerns. This paper details the technical advances in rectifier design for the next generation of cathodic protection rectifiers which has resulted in the development of "Touch Safe” rectifier technology. Advanced microprocessor technology, electronic fusing, and multiple access doors for an inherently safe design are discussed in detail for the "Touch Safe” rectifier.