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This document analyzes voltage drop in a street lighting system with 16 Mv Cable Sizing Calculation Excel - Free download as PDF File (. 1 – In the absence of any other consideration, under normal service conditions the voltage at the terminals of any fixed current-using equipment shall be greater than the lower limit corresponding to the in voltage (V). We can also calculate the cross section area of the conductor in Excel. drop: Voltage drop on the load (difference between the output tension from the supplier and the minimum operating tension of the connected device); Length: Line length ( distance from the supplierx 2 ) in metres; I. 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