The minimum bend radii may be reduced only if specifically allowed by the conductor manufacturer.It is possible to bend the ½” diameter copper tube above to a smaller radius. The resistivity is 10.371 ohm circular mils/foot at 20☌ surface of the cable. The copper bus bar is ETP-110 100% IACS (International Annealed Copper Standard) conductivity (0.15328 ohm-gram/square meter) per ASTM B187. The surface roughening that may occur at the bend is not serious as long as it is only a surface condition.Ĥ. The minimum bending radius for aluminum is equal to twice the thickness of the bar. The minimum bending radius for copper is equal to the thickness of the bar.
Ampacity rating to be used when the long axis of the bars is in the horizontal plane, or when the spacing between bars is less than the thickness of the bars, or when the bars are run in a vertical direction.ģ. The spacing between bars is equal to or more than their thickness, and the bars are run in a horizontal plane.Ģ. The bars are run with their long axis vertical. The ampacity rating is based on a 30☌ rise above a 40☌ ambient. If you wish to purchase a copy of the complete Standard, please visit the ATIS Document Center. Further reproduction or use of this document is prohibited without the express written permission of ATIS. The ampacities that follow are from Table 5 of Standard T1.311, and are reproduced here solely for the convenience of the viewer.
CDA would encourage the reader to use the more conservative of the two figures, if there is a discrepancy. The number of sizes shown are not as extensive as those in the tables of AC ampacities, and there may be slight discrepancies between the ampacities shown here and those obtained by calculations derived from AC ampacities. The following tables have been provided by the Alliance for Telecommunications Industry Solutions (ATIS), T1 Committee, and represent ampacities for busbar sizes and arrangements typically found in the telecommunications industry.
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