2026 DUCTILE IRON POLES

2026-11-03

Design Guidelines a . General i . The nominal voltage range for Ductile Iron Pole structures will be 12 . 5kV to 115kV . b . Pole Design i . Pole shafts longer than 70 feet must be designed in multiple sections . Pole shafts less than 70 feet must be provided in one piece . ii . In fabrication any member must be at least the thickness required to develop adequate strength based on an equivalent NESC Grade B Wood Pole ( ANSI 5 . 1 ) equivalent tip loads . iii . The pole shaft must have a uniform continuous taper for its entire length . iv . Pole tops must come with a flat cap that is NOT ductile iron or welded . v . Poles embedded in the ground must have a bottom bearing plate . The plate must be flush with the interior diameter of the pole shaft and be capable of allowing water to drain out of the pole . c . Pole Classes i . Poles shall be of the lengths and classes in accordance with requirements referenced in the latest ANSI 05 . 1 . 4 . Pole Materials a . Ductile Iron i . The ductile iron used to manufacture the centrifugal cast pole sections must be evaluated according to ASTM A536 and conform to ANSI C151 . b . Chemical Properties i . Extremely low amounts of tramp elements may be allowed . 5 . Ground Connections a . A threaded hole ground connection must be provided and must be formed using a 27 / 64 ” bit and a 1 / 2 ” 13 UNC tap . The threaded ground hole must be greased with a conductive antioxidant and plugged with a temporary plastic plug . i . The threaded ground hole must be located 14 inches above ground line , located on the 270 - degree axis ...

Oregon

2026-04-08