Mar 2, 2005 · Re: NEC Handbook Voltage Drop Formula allang Consider the following In a balanced 3 phase circuit you consider the distance one way when calculating line to neutral …

Aug 25, 2015 · He pointed out a formula for voltage drop, and it included the constant value "21.6." He asked my boss to explain that value (what it meant, where it came from, how it can …

Sep 7, 2007 · Voltage Drop in the NEC OK, I have another question about voltage drop. From where did the Vd= (2xLxKxI)/CM equation come? I see it as the recomended method for …

Apr 18, 2025 · Same current, but the voltage is 120V, so a factor of 1/sqrt (3) less allowable absolute voltage drop. And the voltage drop formula has a factor of 2 instead of sqrt (3).

Jun 5, 2023 · The one-way voltage drop formula gives the resistive voltage drop on a single conductor. For a 2-wire circuit, a resistive load has current in phase with the voltage between …

Apr 24, 2016 · You do need to divide by 208 since that is the load voltage you are dropping from. You can actually make it even more complicated with the vectors involved, but the answer still …

Sep 14, 2022 · My question is when doing a voltage drop calculation where you have, lets say, a 480V bus distribution system, and then a 480-208/120V step down transformer and you are …

Feb 3, 2010 · X = Reactance ohm/km/per O (Tetha) = ArcCosin (p.f) I=Ampere l=length 380 = line to line Voltage and we know that 220 line to neutral = 380/1.732 (line to line voltage) it is …

Jun 26, 2006 · Don't use the approximate "K" values for that voltage drop calculation. Use the actual "K" formula of K = R X CM / 1000. Example: Table 8 resistance of #12 solid copper is …

Jan 6, 2006 · In general when we do voltage drop calculatio for 1. 1 phase AC system we use the following formula VD = 2xIxRxL/1000 2. 3 phase AC system we use the following formula VD …