ConstructionAluminum alloy 1350-H19 wires, concentrically stranded. SpecificationsAAC bare conductors meet or exceed the following ASTM specifications :B-230 Aluminum Wire, 1250-H19 for Electrical PurposesB-231 Aluminum Conductors, Concentric-Lay-StrandedB-400 Compact Round Concentric-Lay-Stranded Aluminum 1350 Conductors Notes Resistance is calculated using ASTM standard increments of stranding and metal conductivity of 52.5% IACS, AC resistance at 60Hz Current ratings are based on 75oC conductor temperature, 25oC ambient, 2ft/s wind, 96/watts/sq.ft sun, .05 coefficients of emissivity and absorption.