OAR 437-003-3600: Equipment

(1) For lines rated 50 kV or below, minimum clearance between the lines and any part of the equipment or load must be 10 feet. (2) For lines rated over 50 kV, minimum clearance between the lines and any part of the equipment or load must be 10 feet plus 0.4 inch for each 1 kV over 50 kV, or twice the length of the line insulator, but never less than 10 feet. (3) Cage-type boom guards, insulating links, or proximity warning devices may be used on equipment but the use of such devices must not alter the requirements of any other regulation of this part even if such device is required by law or regulation.