Calculated Industries ElectriCalc Pro User Manual

Also see for ElectriCalc Pro: Pocket reference guide

Contents

38 — electricalc® ProVOlTaGE DROPThe reduction in Voltage between the power source and theload can be determined by entering the Phase, Volts, Amps,Wire material, Voltage Drop Wire Size and Length of run.The calculator determines Resistance and then the Voltagereduction. Voltage Drop can be displayed as Volts dropped, oras a percent reduction of potential load.This calculator also finds Voltage Drop Wire Size once youhave entered or calculated the Phase, Volts, Amps, Length,Wire Type, and allowable VD percentage. It will solve for thedistance () once you have entered or calculated thePhase, Volts, Amps, Wire Type, Voltage Drop Wire Size, andallowable VD percentage. The ElectriCalc Pro uses Resistancevalues found in NEC Table 8 Chapter 9 to determine VoltageDrop.Note: Voltage Drop solutions may vary slightly from actual AC circuitmeasurements, as the calculator does not incorporate factors suchas inductive reactance, skin effect, raceway material, etc. In mostsituations, the DC Voltage Drop calculation method is sufficient to meetsafety standards for AC systems.IMPoRTanT noTe on VolTaGeDRoP CalCulaTIonsThe ElectriCalc Pro calculates Voltage Drop and Wire Size using DCResistance as defined by the 2011 NEC. To find the Voltage Dropfor a specific Wire Size, you must first enter Amps and the one-waywire Length (and other required variables), entering the specific WireSize last. Otherwise, for your safety, the calculator will recalculatethe Wire Sizes based on the NEC Ampacity Tables and maximumallowable Voltage Drop.finding single-Phase Voltage DropYou are installing 175 Feet of 75°C, #8 THW branch circuit Copperconductors to supply an 11A load on a 208V 1Ø system. What is thesource Voltage Drop at the load?