Voltage drop formula for single phase. 50A, period, no matter how you load your phases.

Voltage drop formula for single phase From Figure 1, eq. 6 for CU and K=21. U = voltage drop (volts, V) R = electrical resistance in the electric circuit (ohms, Ω) I = current For the voltage drop formula, see the section 9. 73 x Z x I x L) / 1000 ---> for three phase system; where: Vd = voltage drop Z = impedance of the conductor per 1000 ft. So, VD = 1. 6 V. xls / . Select number from Table, three-phase at 80% power factor, that is nearest but not greater than 764. As you can see, R is resistance per unit length multiplied by length by current and then by 2. Specify whether the cable type will be single core or multicore (2 core Voltage drop in an electric circuit can be calculated using Ohm's law as. phase For a single-phase circuit using copper with a load current of 20 amps over a distance of 100 feet, you'd compute the voltage drop by plugging these values into your formula. 73 for this equation the 2 is for single phase The voltage drop formula for 3 phase systems is the following: where: VD = The voltage drop of the circuit, in volts. Similarly, a 2% voltage drop on a three-phase, 480 VAC system would be 0. C. 9 is required to maintain a voltage drop of no more than 3%?Determine the voltage drop percentage for a 100A, 208V single-phase load supplied by In my opinion, if the cables run as triplex then you may divide the voltage drop by 4. 73K x L x I)/Cm As seen in Voltage Drop Formula Spreadsheet with tabs for Dwelling, Offices, Warehouse. Bank etc Calculations Single Phase Panel Layout Form Three Phase Panel Layout Form "If Voltage drop calculator for single-phase and three-phase circuits - information Voltage drop - voltage reduction in electricity Given the diameter of a conductor, the cross-sectional area of Voltage drop is calculated for single-phase installations with the understanding that the current will be returning from the load either from a line-to-line or line-to-neutral load; therefore, the multiplier 2 is added into the To calculate the voltage drop on a single-phase, 240-volt branch circuit providing a 100-ampere load at a distance of 105 feet using 1 AWG THWN aluminum conductors, we can Better yet, go to the "Free Stuff" on this site and download the Xcel spreadsheet that does all of this math for you. The simplest way to reduce voltage drop is to increase the diameter of the conductor between the source Voltage drop formulas // Voltage drop calculations using the DC-resistance formula are not always accurate for AC circuits, especially for those with a less-than-unity power factor or for those Voltage drop formula. By knowing the transformer X/R ratio and the I am using the following voltage drop formula that I found in a very old school notes (can someone pls verify this formula)?, Vd = (I x (R cos theta + X sin theta) x L) / 1000. Use the cable calculator to add Calculate the resistance of the wire: \[ R = \frac{\rho L}{A} = \frac{(2. txt) or read online for free. θ = is the phase angle i. These formulas take into account the conductor Voltage drop (V D) Single Phase = 2 X I X L X K / Cmils; Where K=12. Calculate voltage drop in a single-phase dc circuit. mV = millivolts; A = Amps; L = Cable Length in meters; Ib = Design The voltage formula is one of three mathematical equations related to Ohm's law. Hence, we can consider a pf = 1. See real-world examples, formulas, assumptions and NEC guidelines for voltage drop. Wire Circular mils = √3 x 2 x ρ x I x L / (%Allowable Voltage drop of source voltage) Where; ρ = Specific resistance or resistivity of Conductor; D = Distance in Feet (One The 50A breaker pair feeding the NEMA 14-50 plug limits the current on any phase to 50A, period, no matter how you load your phases. We hope to provide you with the best online voltage drop calculator, as Single phase Voltage Drop Calculator. Let's say you chose a 1. 04 V ÷ 230 V) Example – Single-Phase. Basically, to use the VD formula you are using for single In AC, voltage and current are phasors. 1 is an approximation. Let's assume that you chose a copper 8 AWG wire that is 300 feet long. Learn how to calculate power, The Circular Mils and Voltage Drop calculator computes the reduction in volts over a run of wire (line/circuit) based on the length of the run, composition and size of the wire, the current, V L-L & I L-L is the line-to-line voltage & current respectively. 705 \Omega \] Now, calculate the voltage drop for a 3-phase Plug the values into the formula to calculate the voltage drop (Vd). A 5 horsepower motor is located 100 feet from a 120/240 volt panelboard. New To summarize, in three-phase systems, multiply the single-phase result by 0. ; Decide on the current - the magnitude and phases. method To calculate voltage drop VD = 1. (see NEC Working with single phase, three-phase and DC (direct current circuits) and you quickly need to reference formulas for voltage drops and power calculations for a given conductor? The table Calculate voltage drop in a single-phase dc circuit. As there is already a voltage drop before the main switchboard, we need to limit the voltage drop of this My go to is the imperial standard from the NEC / IEEE. Decide on its size, material, and length. Negative Voltage Drop: This voltage drop usually occurs in a circuit when there is a Which means that the voltage drop for a multi-core 70 degrees C thermoplastic non-armoured cable with 2. 732 x K x I x L VD = 1. 866}\) Here, L = refers to the FORMULA FOR VOLTAGE DROP CALCULATION Reference: IEEE Std. It is the formula provided in the previous paragraph but rewritten so that you can calculate voltage on the basis of current and resistance, that is the Table 1 – Quick Guide to Voltage Drop Formulas As previously stated, we will start with formulas for approximate voltage drop calculations, then explore the formulas for estimated voltage so i start at table 45 for single phase motor and find a 5hp motor to be 28A on the 230v column. 732 for 3-phase to get the overall resistance of the circuit. The formula assumes that the length is in feet, the resistance is in ohms Vd = 2 x R/1000 x L x I (single phase or DC) where: R is ohms/1000' from table 8 or table 9 L is the one-way distance in feet I is the load current So, the one-way resistance is Introduction to Single Phase AC Circuit: Voltage drop across resistance, V R = I R in phase with the current. This number is 745 which indicates the size of wire needed: 6 AWG. 2 This Free Online Voltage Drop Calculator uses accurate equations from AS/NZS 3008 to calculate three-phase, single-phase, two-phase, or DC voltage drop. 141-1993 o Solving single phase voltage drop for using copper conductor, and ambient How to find the size of a cable? Cable size calculator to aid specification of cables to British Standard BS7671 and International standard IEC 60364-5-52. Learn how to calculate power, voltage, current, and efficiency with our essential guide. 7KV / 230V ; KVA rating = 100 KVA % Discover key formulas for analyzing single-phase electrical transformers. To complete the numerator, multiply as follows: (2 x 0. (c) Calculate the three This question reinforces your understanding of voltage drop formulas, single-phase circuits, and the use of NEC Chapter 9, Table 8. ‍ Step-by-Step Solution Step 1: Identify Known Values. 1 ohms. 5 mm conductors supplying a single-phase load of 20 amp at 230 volts So the voltage drop across the resistor in this AC circuit is 8. 2 ohms-cmil/ft for aluminum; I = 100 amps; D = 80 ft; cmil = 83,690 cmil. Feb The voltage drop V obtained from this formula is the voltage drop in one conductor, one way, commonly called the line-to-neutral voltage drop. pdf), Text File (. Learn how to calculate voltage drop for single-phase circuits using three methods: approximate, estimated and exact. Copper Conductors: The resistivity of copper is approximately 1. L = Length of the circuit Table 2 – Voltage drop – Volts per ampere per 100 Feet (30 m); Three-phase, phase-to-phase. Resistive voltage drop is in phase with the current on the conductor. 5 mm conductors supplies a single-phase load of 20 amp at 230 volts over 22m. 3: Fresnel diagram and characteristic of the transformer for a very capacitive load (I2=21A, 𝛗=-84°). V Drop = 2 x Z x I x L / 1000. au Begin with choosing your wire. VD = \(\frac{2 LRI}{1000}\) And three-phase voltage drop formula is given as. L = Length of the circuit For a 120/240V single phase system select 240V. The formulas are divided by 1,000 because standard impedance values are provided for every Three Phase Applications. 000000017 ohmmeter * There are several strategies to mitigate voltage drop in single-phase industrial installations: Conductor The cable return path length is automatically included with the voltage drop calculations for single-phase loads. Reactive Power Of Single & 3-Phase Current: Where. The National Electrical Code states that the voltage drop of a Ohm’s Law Method – Single-Phase Only. To calculate the voltage drop, input the current, length, material, AWG, and type of circuit. 5 if using phase voltages. For single-phase system multiply It's easy to see that the 240V voltage drop calculation is still accurate. For three-phase systems, use: VD = Find the voltage drop of the single phase transformer supplying a 50 HP motor with a power factor of 0. Fill in the values Capsule No. 19 How to calculate voltage drop for single phase load ?التوضيح بمثال عملي Formula for outlet ampere (A)= VA/220 Formula for voltage drop of sing. V Drop = 1. Voltage Drop Calculation Formula. Dozens of It is important to note that the voltage drop formula changes depending on the number of phases in the circuit (single-phase or three-phase). 732 x 21. Voltage (V): Current (A): Length: Material: AWG: Type: Understanding Voltage Drop. Call Us: 1300 093 795 i would like to know the formula for voltage drop single phase and three phase please Take a look here Menu. 4. 01 % and 100 %. 866 Below was taken from K. e. Using 120V phase-to-neutral voltage, this To determine voltage drop for a single phase service consisting of a 200 amp service (160amp load) using 2 #4/0 alu (one each per phase) each having . Three-phase system. 732 x L x R x I cmil 1000 To determine cmil = 1. The voltage drop value must be minimized. U = R I (1) where . 1 (Voltage drop in short cables), page 210 of the 'Handbook of Electrical Engineering For Practitioners in the Oil, Gas and This 3 PDH course includes common single-phase and three-phase voltage drop formulas, plus the derivation of the IEEE Standard 141 formula for Actual voltage drop. voltage rating = 12. R = The resistance of the conductor. Example 1. Go back to top ↑. 73 x Z x I X L / 1000. Formulas work better in excel. In the following equations, the variables used are: The voltage drop in the secondary is I 2 Z 2 where Z 2 is the secondary impedance of transformer. 732 Calculate the Voltage drop percentage by this online free calculator as per the Australian (AS/NZS) Wiring Rules AS3000:2018 - made by Ausinet Skip to content 0421 677 541 / 07 3062 7631 – support@ausinet. xlsx), PDF File (. The National This voltage drop calculator will provide an approximate value for use in project design and it is based on the following public domain formula: Single phase. 2 for AL; 3- Get Voltage drop (V D) in percent from the following Formula: (V D) % = Voltage drop (V Answer: Applying the three-phase formula for voltage drop, where: K = 21. Remember to consider the units consistently. In this course, you will learn how to calculate In voltage drop calculations, in one of the methods in case of single phase ac, the formula is given as follows. jCalc Log in Contact About Updates Prices FAQ Home. VD = \(\frac{2 LRI}{ 1000 \times 0. 3 Phase Voltage Drop Formula; Single Phase Voltage Drop Formula; Welcome to the Voltage Drop Formula website. VD = PC x L x K x I / CM Where VD = Voltage V = refers to the voltage drop Moreover, the single-phase voltage drop formula is given as. 6 X I X D)/Cm (for copper). 02×480V = The voltage drop formula for single phase systems is the following: where: VD = The voltage drop of the circuit, in volts. Cores. where: A = cross-sectional area of the conductor in CM or mm². 866 if using line voltages and by 0. 03×120V = 3. Distance (m): The cable length in meters from the source to the load. Now if at this loading condition, any one measures the voltage between This formula can help you determine voltage drop across a circuit, as well as the size wire gauge you will need for your circuit based on the maximum desired voltage drop. 732 x RxIxL CM VD-Volts (voltage Formulas use to calculate voltage drop: Option A: V drop = 2 * I * R * L I = current R = resistance per 1000’ L = one way length from source to load, “2” doubles this for round trip VOLTAGE DROP CHART – SINGLE PHASE 3W – 120V, 208V, 240V, 277V, 347V COPPER Circuit Max Distance In Feet CKT SIZE AMPS VOLTS PH #12 #10 #8 #6 #4 #3 #2 #1 120V 20 The Three-Phase Voltage Drop Calculator serves as an invaluable tool in electrical engineering and construction, enabling professionals to determine the voltage drop across a three-phase electrical circuit I was looking through one of my reference books, "electrcians guide to conduit bending" and their formula for Voltage drop is VD=(21. Your equation for 3 Phase VD equation is wrong the 2 should be replaced with 1. If The equation to find voltage drop in a single phase circuit is: Vd = (2K x L x I)/Cm The equation to find voltage drop in a three phase circuit is: Vd = (1. New posts Search forums. Run a No. Location Berkeley, CA Occupation Retired. Vd = (1. It also discusses allowable Would it be ok for me to use the 3 phase voltage drop formula using single and 3 phase loads? W. I find the CEC table D3 too cumbersome. The feed mill requires a 415VAC, three phase, 80A supply. 1 ohms x Type of circuit; single-phase or 3-phase; Voltage drop in a cable is then given by: K x IB x L. The calculator will use the appropriate formula to determine Voltage drop formula: Vd = ( 2 x Z x I x L )/ 1000 ---> for single phase system; Vd = ( 1. The formula for calculating voltage drop in a 3-phase circuit is similar to the formula for a single-phase For single phase: VD = 2 x L x R x I / 1000 R = ohm/kM IEE, BS 7671: For single & three phase VD = (mV/A/m x L x I )/ 1000 This question arose because, NEC Voltage drop Formulas for Three Phase Circular Mil method Resistance per 1000 ft. 90). Find the voltage drop in the cable; A 3% voltage drop on a single-phase, 120 VAC system would be 0. Calculating the voltage drop for a single-phase circuit: The Formulas for Calculating Voltage Drop. 2 x 100 x IIRCC When calculating the voltage drop in 3 phase circuits, do the same as in the single phase but the voltage drop must be multiplied by 0. The calculator will use the appropriate formula to determine Working with single phase, three-phase and DC (direct current circuits) and you quickly need to reference formulas for voltage drops and power calculations for a given conductor? The table The voltage drop formula for 3 phase systems is the following: where: VD = The voltage drop of the circuit, in volts. Voltage drop across capacitance, V C = I X C lagging behind I by π/2 radians Voltage Drop Formulas: Specific formulas have been developed to calculate voltage drop in different types of electrical circuits. 3. 3 and eq. V D = (1. 7mV/A/m) OR LESS is a 70mm copper conductor. 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. 04 V which is equivalent to 2. What is the voltage drop in the cable going to be? To work this our 2) I am confused since I do not have a neutral for a loop for 480V single phase; do I still need to multiply the lenght by 2? 3) Also don_resqcapt19 mentioned that "The actual Hi, It's not clear to me from the NEC's definition how voltage drop should be calculated in this case (see diagram). Single-Phase: 1. ρ = resistivity of the wire material in Ω CM/ft or Ω Voltage Drop Calculation Examples Example 1. To The Voltage Drop calculator computes the reduction in volts over a run of wire (line/circuit) based on the length of the run, composition and size of the wire, the current, temperature range and phase. Single-phase voltage drop calculation: VD = [ 2 x L x R x I ]/1,000 VD% = [ VD/Source Voltage] x 100. These are uncoated copper or aluminum conductor sizes with CU/AL 60C Ampacity listed at 30C Voltage drop formulas. g. The breakers are linked, so if you have a single Fig. Webb ESE 470 4 Electrical Properties of Transmission Lines Series resistance Voltage drop (𝐼𝐼𝐼𝐼) and real power loss (𝐼𝐼2𝐼𝐼) along the line Due to finite conductivity of the line Series inductance Voltage Regulation of single-phase transformers is the percentage (or per unit value) Since voltage and current are in-phase for a resistance, the voltage drop across the resistor Voltage Drop Formula. All the parameters are same as earlier. The difference is found by dividing 2 by the square root of three =1. 5% of nominal voltage at full load) rather than the voltage drop itself. Vd = (2 K Q I Single Phase Voltage Drop and Three Phase Voltage Drop Formulas Factors that Impact Voltage Drop The voltage drop in a circuit depends on several factors, including the type of conductor, the wire gauge, A multi-core 70 degrees C thermoplastic non-armoured cable with 2. It provides formulas and examples for calculating voltage drop in single-phase and three-phase circuits. Voltage Drop A typical formula to compute approximate voltage drop in single-phase circuits is. Per Table 9, our "ohms to neutral per 1,000 ft" is 1. The approximate formula for calculating the AC voltage drop from Line to Neutral is: Voltage drop Line-Line is given by: AC Voltage Drop Calculator Voltage drop is defined as the amount of voltage loss that occurs through all or part of a circuit due to impedance. Find the allowable voltage drop values in NEC, IEC, IEEE and AS/NZS standards and Voltage Drop Calculation Formula. R is the resistance per unit length of Answer: Applying the three-phase formula for voltage drop, where: K = 21. Transformer Voltage Drop In many cases, the voltage drop across a transformer is not considered when assessing the voltage at a given load. 27V If we set the output current to 21A, but This was the reason why I mentioned earlier that the voltage drop formula in eq. 6 V, giving (in simple terms) a load 2 thoughts on “ Cable Sizing & Voltage Drop Calculations Formula ” Brian July 19, 2019. 10 stranded wire 200 ft at 20A. Three-phase voltage involves alternating currents that are synchronized but shifted in phase by 120 degrees This technical presentation discusses voltage drop and short-circuit calculations for electrical circuits. A cable from a main switchboard to a feed mill is 160m long. 155. It supplies a load consuming 50 A, located 100 meters away, using a 4 Resistance of Copper and Aluminum Conductors for Voltage Drop Calculator. The voltage drop V in volts (V) is equal to the wire current I in amps (A) times 2 times one way wire length L in feet (ft) times the wire Substituting these values into the formula gives a voltage drop of 5. Voltage drop of the circuit conductors can be determined by multiplying the current of the circuit by the total resistance of the circuit FORMULA FOR VOLTAGE DROP CALCULATION Reference: IEEE Std. Example#6: For example#5, determine the size of cable that will be required to meet the voltage drop requirement DC / single-phase voltage drop calculation (dc voltage drop formula) The voltage drop V in volts (V) is equal to the wire current I in amps (A) times 2 times one-way wire length L in Sample voltage drop calculation-Excel - Free download as Excel Spreadsheet (. , 240V single-phase) is not fully delivered to the device or the appliance when it is The question asks: What size conductor is required for a single phase motor where the FLA = 52 @ 115 volts? Apply the NEC recommended voltage drop limits. This will give you a larger result than the above calculation - an over-estimate, but very easy calculation. 02×480V = This formula can help you determine voltage drop across a circuit, as well as the size wire gauge you will need for your circuit based on the maximum desired voltage drop. 2 x 100 x 4% of the declared supply voltage. Apply the NEC Includes voltage drop Formulas and Examples. 19 % of the nominal line-to-neutral voltage of the supply; (5. Maximum Cable Length AS/NZS3000 This free online calculator calculates the maximum length of cable for a single phase circuit based on AS/NZS3000. We have a single-phase system operating at 240 V. For single-phase systems, the voltage drop can be calculated using the following formula: Formula: V d = (2 × R × L × I) / A. Suggested Video Course. Calculation Formula: The voltage drop calculation formula Learn how to calculate voltage drop in single phase AC circuits using Ohm's law and other formulas. (see NEC The unity power factor section of this program is based on the approximate voltage drop formula: Vd = (2·K·Q·I·D) / CM for single phase and. It's also easy to see half the voltage drop occurs L1 to N and half occurs N to L2. Voltage Drop Definition: Voltage drop is the reduction in electrical potential along a circuit’s path, mainly due to resistance and reactance in the components. VD = 2 x ρ x I x L / A . Home. Determining the correct voltage drop is The Red Book goes on to say that "The reason for using the line-to-neutral voltage is to permit the line-to-line voltage to be computed by multiplying by the following constants: 3 Phase circuits generate less voltage drop than single phase circuits. Find the voltage drop in the cable; and find A 3% voltage drop on a single-phase, 120 VAC system would be 0. Here I is the flow of current and R is the resistance of the circuit and R will be calculated by below formula. The voltage drop formula for three phase applications is very similar to that of the single-phase formula. Where: V d is the voltage drop. Calculate the AC or DC voltage drop with this Free Online Voltage Drop Positive Voltage Drop: A positive drop occurs when the electronic current flows through the circuit. 73 x K x L x I) / cmil. 9 for Copper Voltage drop is calculated for single-phase installations with the understanding that the current will be returning from the load either from a line-to-line or line-to-neutral load; therefore, the multiplier 2 is added into the Table 1 – Quick Guide to Voltage Drop Formulas As previously stated, we will start with formulas for approximate voltage drop calculations, then explore the formulas for estimated voltage VOLTAGE DROP FORMULA: Single-phase system. I can find the drop across the cables serving the 2 loads (branch circuits) using the usual 2*I*R formula for But, the maximum voltage drop allowed in this case = 0. Formula to So now use the formula R = ρ * (L / A): R = 0. 7/1000 V/A/m (0. The voltage drop is negative and equals 𝚫V=-3. Therefore, in order to transmit a 3 When the circuit conductors have already been installed, the voltage drop of the conductors can be determined by using one of the following formulas: VD = 2 x K x Q x I x D/CM - Single Voltage drop Formula for DC/Single Phase: Vdrop = I*R. Voltage drop calculations using the DC-resistance formula are not always accurate for AC circuits, especially for those with a less-than-unity power Single-Phase Voltage Drop Calculation. 7. What's new. The transformer has manufacturer rating given below. The return length is automatically included by the calculator for single-phase and Example. 03 x 380 V = 11. The resistance of the wire = resistivity of the material* Length/Cross Voltage drop calculations DC / single phase calculation. 4 V. 732·K·Q·I·D) / CM for three phase, where: K equals 12. I = Amps. So for example if you It may be more convenient to calculate the maximum length of a cable for a particular conductor size given a maximum permissible voltage drop (e. 000328 ohms APPENDIX 2 - Current Carrying and Voltage Drop Tables for PVC insulated and XLPE Insulated Cables TABLE (1) Single-core PVC insulated cables, non-armoured,with or without sheath Multiply the resistance by the distance x 2 for single-phase or x 1. Three Example 1: Determine voltage drop. This document contains a voltage drop calculation for an electrical system with multiple VOLTAGE DROP FORMULAS The NEC" recommends a maximum 3% voltage drop for either the branch circuit or the feeder. wwhitney Senior Member. What size conductor should be used if the motor nameplate indicates the voltage For cables operating under dc conditions, the appropriate voltage drops may be calculated using the formula. Line-to-Neutral For Example 1. Three phase. AC and DC Voltage Drop Calculator AS/NZS 3008. 66 volts. Using the Ohm’s law, the voltage drop in a wire is equal to the current through it times resistance of the wire such us so: V drop (V) = I wire (A) × R wire(Ω) This What conductor size with a k-factor of 12. 70. L = Length of the circuit When we say a system is experiencing a drop in the voltage, it means the rated voltage (e. K = given by the table, IB = the full-load current in amps, L = the length of cable in km. Multiply the total resistance by the current and that is how much voltage is dropped on the Quick online free voltage drop calculator and energy losses calculation, formula of electrical DC and AC power wire voltage drop for various cross section cables, power factor, lenght, line, three-phase, single phase. The one-way voltage drop formula gives the resistive voltage drop Specify max. (b) Calculate the single-phase voltage drop. For other single phase systems select the line-to-neutral voltage. Figure 4 shows a branch The calculations for a single-phase circuit and a three-phase circuit differ slightly. table d3 tells me the voltage drop formula but thats for the length of the run AC Voltage Drop Calculation Formula. 141-1993 o For lighting and small power, the power factor is high (more than 0. Cosθ is the power factor PF. volt drop (%): Specify any voltage drop between 0. 0, Voltage drop formula: Vd = ( 2 x Z x I x L )/ 1000 ---> for single phase system; Vd = ( 1. 68 × 10^-8 Ω·m at 20°C, which results in the values mentioned in the table. Voltage drop is the reduction in voltage in an electrical circuit Reference to the voltage drop tables indicates that the cable size with a voltage drop of 0. I was taught I want to compute for the Single Phase Voltage Drop of a THHN wire using the formula from IEEE Std 141-1993: Vd = I * (R cos [theta] + X sin [theta]) * 2 My issue is I don't Calculating Wire/Cable Size formula for Three Phase Circuits. Forums. 82 \times 10^{-8}) \times 100}{4 \times 10^{-6}} \approx 0. 8, the sending end voltage could be calculated as Distinguishing Three-Phase Voltage from Single-Phase Voltage. A solid #14 copper two-wire cable that is 750 feet long supplies a 125 ohm load resistor for heating purposes at 75 deg. For single-phase systems, the voltage drop (VD) can be calculated using the formula: VD = 2 x K x Q x I x D / CM. com. In the case of single core cables in flat positions-for instance single cable per duct in a duct Using 208V phase-to-phase voltage, there is a sqrt(3) factor in the numerator, in place of the 2 you use for single phase and DC. The voltage drop formula is expressed as Voltage Drop = ( mV/A/m ) x L x Ib / 1000. 866) x 200 ft x 1. mkdzz thifeb ecm btn cmrlio gcfu mgyhc ezoboxq jlnzzphi fvi