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Voltage Drop = in volts (V). I = Current in amperes. R= Conductive resistance in ohms/ 1000 ft. X= Conductor inductive reactance in ohms/1000 ft. L= one way Answer: First, calculate the total voltage drop allowed in the circuit. This is done by. (240 volts x 2%) or 4.8 Voltage Drop. Then use the single-phase formula Formula for Voltage Drop Calculation o Formula for resistance of a copper conductor with o Solving voltage drop for single-phase lighting loads. The system source is 240 volts, 3 phase, and the supplying circuit breaker is. 125 A. The feeder is in a trade size 1¼ aluminum conduit with three 1 AWG THHN Multiply distance (length in feet of one wire) by the current (expressed in amps), by one over the number of conductors per phase. Divide that figure into the If the supply is single-phase at the usual level of 240 V, this means a maximum volt drop of 4% of 240 V which is 9.6 V, giving (in simple terms) a load voltage Page 5 of 57. The first two types of formulas in single-phase sections and the three-phase sections are for approximate voltage drop calculations.