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It then details determining the minimum cable size based on continuous current capacity, Key learnings: Voltage Drop Definition: Voltage drop is the reduction in electrical potential along a circuit’s path, mainly due to resistance and reactance in the components. 19(A)(1), Informational Note No. 141-1993 V D = KI (R cos ф+ X sin ф) Where: V D –Voltage drop (volts) K –multiplying constant (2 for single phase, 𝟑 𝐡 𝐡𝐚 ) I –current flowing in conductor (amperes) R –line resistance of conductor (ohms) If you are not familiar with voltage drop calculations, then you should definitely consider using a voltage drop calculator excel spreadsheet. This document provides links to download Excel spreadsheets for various electrical engineering calculations related to cable FORMULA FOR VOLTAGE DROP CALCULATION Approximate Formula for Voltage Drop: Reference: IEEE Std. BS-7430 Resistance: This Typical HT & LT Power Cable Sizing Calculation - Free download as Excel Spreadsheet (. 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