#1 = 83690 x .000253 = 21.17, we usually figure 21.2 in the voltage drop formula. Another Aluminum example: #12 = 6530 x .00318 = 20.76, so there are some variances depending on the wire size. To the OP I just did this to a few wire sizes but did not come up with 21.6 but I am sure there is a wire that may come close.

2009年1月18日 · Voltage Drop Calculation Sheet Voltage Drop Calculation Sheet I put together a spread sheet that calculates for me in excel. It works great. I use it anytime long runs to a motor is required. It has save me a lot of headaches. I would attach it if I were allowed.

2012年2月21日 · Steve, the FLA issue aside, K is derived from table 8 of the NEC: for K multiply the area of a wire in circular mills by the resistance in ohms per 1000 feet as found in Table 8. I don't think K is mentioned anywere in the NEC, just as voltage drop is only mentioned in an Informational Note #4 on 210.19.A.1

2010年2月3日 · 380 = line to line Voltage and we know that 220 line to neutral = 380/1.732 (line to line voltage) it is substitude because of impedances are per phase so we must use line to neutral voltage (220) or 380/1.732 volt. The above information is a …

2005年3月2日 · Re: NEC Handbook Voltage Drop Formula The concept of voltage drop is very basic. Regardless of the formula that you use, it is a modification of E = IR. The formula that is given in the NEC Handbook is: Vd = 2RLI / 1000 Vd = voltage drop (in volts) R = resistance of the conductor per 1000 feet I = amperes

2009年1月10日 · In medium and high voltage systems and lighting strikes reactance becomes very important with impedance (resistance) becoming a lessor factor. Also, 2KIL / Cmils is only part of the DC voltage drop formula. The other part is application of ambient temperature adjustment formula for the resistance value.

2016年11月25日 · The 3ph cable sections selected is by means of ampacity and voltage drop calculation by means of the following formula; Vd = sqrt(3) * L/1000 * I * (R*cosPHI + X*senPHI), being cosPHI=Power Factor. The criteria is not to reach to the 2% voltage drop from switchgear to MCC/Panel; and 3% from MCC/Panel to the end-load.

2006年9月14日 · I tuypically use teh folowing VD formula for three phase feeders: cm = kx1.72xIxD/vd where, cm = circular mils of conductor k= resitvity of copper (12.9) I = current D = distance (one way) VD = allowable voltage drop for long runs with multile sets this formaul does not seems to work. For example, a 2000a feeder, 200 ft long, 480v with desired ...

2023年6月5日 · In AC, voltage and current are phasors. Resistive voltage drop is in phase with the current on the conductor. 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 the two wires.

2004年5月14日 · Re: Voltage drop calculation spreadsheet I have at least 5 different books that discuss voltage drop and at least three of them use a different value for "K". The only sure fire method is to use the R x cm /1000 forumla using Table 8 values from the NEC. (For example, 12-awg solid has a rsistance of 1.93-ohms at 1000 ft.