It shall be unlawful to maintain or construct in any residential, commercial or industrial zoned area of the City any fence composed in whole or in part of barbed wire or with any similar material designed to cause injury to persons or any wire charged with electric current; except, that in commercial or industrial zoned areas, no more than three (3) strands of barbed wire above a security fence shall be permitted, provided such barbed wire is at least six feet (6') above ground level. (Ord. 2241, 5-16-1987)