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Performance of Branch Circuit Electrical Terminations of Copper and Aluminum Non-Metallic Sheathed Cable.

机译:铜铝非金属护套电缆分支电路电气终端的性能。

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A study was performed to provide the Tri-Services Committee on Building Materials with guidelines regarding the use of aluminum branch circuit wiring in military buildings. The first part of the study consisted of identifying military bases which contain buildings with aluminum wired branch circuits. Personnel at a number of the bases were contacted in order to estimate the extent of observed problems. Laboratory tests were performed on CO/ALR and non-CO/ALR duplex receptacles wired with both aluminum and copper non-metallic sheathed cable. Overheating of aluminum wired termination points was observed with some receptacles in a current cycling test using non-CO/ALR receptacles at screw torque levels of 0.023and 0.069kg-m (2and 6lb-in). Aluminum wired non-CO/ALR receptacles tested at 0.138kg-m (12lb-in) screw torque showed no signs of overheating and copper wired non-CO/ALR receptacles showed no signs of overheating regardless of screw torque. The report presents the findings of the study and includes guidelines regarding the use of aluminum branch circuit wiring in military buildings. (Color illustrations reproduced in black and white.)

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