How do i contact the international brotherhood of electrical workers? International Brotherhood of Electrical Workers. 900 Seventh Street, N.W., Washington, DC 20001, Telephone: (202) 833-7000. Fax: (202) 728-7676.Where are the headquarters of the brotherhood of the united nations? International Headquarters. Sitting next to the Department of Labor and at the foot of Capitol Hill, lies the UBC International Headquarters. The Brotherhood’s International Headquarters is at 101 Constitution Ave., NW, at the heart of Washington D.C.What are the office hours of the international brotherhood of boilermakers? The International Brotherhood of Boilermakers headquarters offices are open 8:30 a.m. to 4:00 p.m. Central Time, Monday through Friday. Most of our departmental offices are located at headquarters:Where can i find contact information for the ibew? Click here for a list of IBEW Departments and their contact information International Brotherhood of Electrical Workers 900 Seventh Street, N.W. Washington, DC 20001