Established in 1957, The Calvert Company manufactures electrical bus duct components and systems for the conduction of the large volumes of electricity within power generation plants. The company offers services to original equipment manufacturers, utilities, industries, and design and construction firms. The Calvert Company has also received ISO 9001:2000 certification from the International Organization for Standardization. The company is one of the leading builders of isolated and segregated phase, bar, cable and open bus configurations in the United States. It offers installation and maintenance services for bus systems. In addition, the company provides a variety of replacement parts. The Calvert Company is a part of AZZ.