Edward Korth, 62, president of Capitol Electric Co. Inc., and an electrical contractor in the Washington area for more than 30 years, died of cancer Tuesday at Sibley Memorial Hospital.

Mr. Korth went into the electrical contracting business here after World War II service in the Merchant Marine. He was a founder of what became Capitol Electric, and had been its president since the early 1950s. The company has worked on major projects in Cleveland and Toledo, Ohio, and Syracuse, N.Y., as well as in this area.

Mr. Korth was born in Buenos Aires, Argentina. His family came to the United States when he was a year old and settled in Philadelphia. He moved to Washington in 1936. Before joining the Merchant Marine, he worked in the Norfolk Navy Yard.

He was a founding member and past president of the Master Electricians Association of the National Capital Area. He was a charter member of Ohr Kodesh Congregation and a member of B'nai B'rith, the Jewish service organization. He also was a supporter of the Hebrew Home of Greater Washington, the National Jewish Hospital in Denver, Colo., the National Conference of Christians and Jews, the United Jewish Appeal, and the American Disgestive Disease Association.

Survivors include his wife, the former Janet Segall and a son, William, of the home in Silver Spring; a daughter, Betty Greenberg, of Olney; his mother, Clara Korth, of Silver Spring; a brother, Hyman, of College Park; and four sisters, Mary Brisker, of Bethesda, Millie Markison, of Kensington, Pauline Esten, of Rockville, and Freda Goldman, of Chicago.

The family suggests that expressions of sympathy be in the form of contributions to the American Cancer Society or the National Jewish Hospital in Denver.