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E.F.U.S. Voltage Drop Calculator E.F.U.S. voltage drop calculator calculates circuit voltage drop based on user entered data and conditions. Selections are made by convenient drop down lists and data entry boxes. Calculations are made based on NEC data and guidelines. If voltage drop exceeds 3% of supply the user is warned by red "percentage" answer fields. Supports decimal precision. The following formulas are used to calculate circuit voltage drop. AC Voltage Drop Zc=(R x cos(phase angle))+XL x sin(phase angle) Single Phase VD=Zc x (length/1000) x amps Three Phase Line To Line VD=line to neutral voltage drop x square root of 3 DC Voltage Drop VD=(2 x Length x Resistance x Amps)/1000 Where VD=voltage drop Zc=corrected impedance R=conductor resistance Phase Angle=power factor phase angle (in degrees) XL= reactance Amps=circuit load in amps Resistance=conductor resistance Length=one way length of circuit |
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