Patent ID: 8652629

Claim:
A structure for supporting a conductor, the structure comprising: a transmission class structural cross arm comprising: a pultruded glass fibre reinforced polymer composite C-channel comprising a two-component polyurethane resin and layers of continuous filament mat, unidirectional roving and triax fabric, a mat orientation of the continuous filament mat being one of: longitudinal, transverse and ±45 degrees, glass of the pultruded glass fibre reinforced polymer composite C-channel being E-glass to electrically insulate the transmission class structural cross arm and a volume fraction ratio of the E-glass to the two-component polyurethane resin of the pultruded glass fibre reinforced polymer composite C-channel being between 50 and 58 to between 50 and 42; and UV inhibitors incorporated into the two-component polyurethane resin of the pultruded glass fibre reinforced polymer composite C-channel; wherein the transmission class structural cross arm is sized to fit into an existing electrical power transmission grid and the continuous filament mat comprises 1.5 oz/ft 2 internal layers and 2.0 oz/ft 2 surface layers with polyester veil stitched.