D-513     For Primary Power Distribution Circuits 6900 to 8000 Volts. A NEW DESIGN     Especially developed for primary service. Modernized and improved shape; rugged petticoats; rounded corners; balanced strenght.
Voltage Rating _ _ _ _ _ _ 11,000 Volts Dry Flash-over _ _ _ _ _56,000 Volts Wet Flash-over _ _ _ _ _30,000 Volts Leakage Distance _ _ _ _ _ _ _ 7 in. Wet Arcing Distance _ _ _ _ _ 4 1/2 in. Diameter Groove _ _ _ _ _ _ 3/4 in. Weight per Piece _ _ _ _ _ _ _ 28 oz. Packed in Cartons of _ _ _ _ _ 30 Weight per Carton _ _ _ _ _ 59 lbs. Weight per 100, packed _ _ 197 lbs.

    In the design of these new insulators, the matter of mechanical strength was given first consideration. Heavier construction was adopted; square corners were eliminated' proper shape and thickness of petticoats were given careful study. All these results in designs affording maximum mechanical strength.