Technical Calculator

Voltage Drop Calculator

The calculator will calculate the voltage drop, its percentage, and resistivity of any wire piece. based on the NEC or wire resistivity data you provide.

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Voltage Drop?

“it is the overall lack of the voltage due to the internal impedance of the circuit”

Voltage Drop Equations:

Voltage Drop system for single segment:

\(V_{drop\left(V\right)} = I_{cable\left(A\right)} * R_{wire\left(ohms\right)}\) \(V_{drop\left(V\right)} = I_{wire\left(A\right)} * \left(2 * L_{\left(ft\right)} * \frac{R_{wire\left(\frac{Ω}{kft}\right)}}{1000_{\left(\frac{ft}{kft}\right)}}\right)\) \(V_{drop\left(V\right)} = I_{wire\left(A\right)} * R_{wire\left(Ω\right)}\) \(V_{drop\left(V\right)} = I_{wire\left(A\right)} * \left(2 * L_{\left(m\right)} * \frac{R_{cable\left(\frac{ohms}{km}\right)}}{1000_{\left(\frac{m}{km}\right)}}\right)\)

Voltage Drop method for 3 segment:

\(V_{drop\left(V\right)} = \sqrt{3} * I_{wire\left(A\right)} * R_{wire\left(Ω\right)}\) \(V_{drop\left(V\right)} = 1.732 * I_{wire\left(A\right)} * \left(L_{\left(ft\right)} * \frac{R_{wire\left(\frac{Ω}{kft}\right)}}{1000_{\left(\frac{ft}{kft}\right)}}\right)\) \(V_{drop\left(V\right)} = \sqrt{3} * I_{wire\left(A\right)} * R_{wire\left(Ω\right)}\) \(V_{drop\left(V\right)} = 1.732 * I_{wire\left(A\right)} * \left(L_{\left(m\right)} * \frac{R_{wire\left(\frac{ohms}{km}\right)}}{1000_{\left(\frac{m}{km}\right)}}\right)\)

Regardless of the section is, the calculator will take multiple seconds to show the actual loss in the voltage transmission.

Diameter of the twine:

For a cable having a diameter in inches and n gauges:

\(d_{n\left(in\right)} = 0.005 inches * 92^{\frac{\left(36-n\right)}{39}}\)

And whilst The Diameter Is In Millimeters:

\(d_{n\left(mm\right)} = 0.127 mm * 92^{\frac{\left(36-n\right)}{39}}\)

pass phase location of cord:

\(A_{n\left(kcmil\right)} = 1000 * d_{n}^{2} = 0.025 in^{2} * 92^{\frac{\left(36-n\right)}{19.5}}\) \(A_{n\left(in^{2}\right)} = \left(\frac{\pi}{4}\right) * d_{n}^{2} = 0.000019635 in^{2} * 92^{\frac{\left(36-n\right)}{19.5}}\) \(A_{n\left(mm^{2}\right)} = \left(\frac{\pi}{4}\right) * d_{n}^{2} = 0.000019635 mm^{2} * 92^{\frac{\left(36-n\right)}{19.5}}\)

Resistance via The cord:

\(R_{n\left(\frac{Ω}{kft}\right)} = 0.3048 * 10^{9} * \frac{ρ\left(Ω.m\right)}{25.4^{2} * A_{n\left(in^{2}\right)}}\)

Voltage Drop Calculation
Wire Material Current (A) Wire Length (m) Resistance (Ω/m) Voltage Drop Formula
Copper 10 50 0.017 \( V = I \times R \times L \)
Aluminum 15 30 0.028 \( V = I \times R \times L \)
Silver 20 20 0.016 \( V = I \times R \times L \)
Voltage Drop for Different Wire Gauges
Wire Gauge Current (A) Length (m) Resistance (Ω/km) Voltage Drop (V)
10 AWG 10 40 3.28 \( V = I \times R \times (L/1000) \)
12 AWG 15 50 5.21 \( V = I \times R \times (L/1000) \)
14 AWG 20 25 8.29 \( V = I \times R \times (L/1000) \)

FAQ’s:

What causes a Voltage Drop?

while the capacity at the end of the cord gets higher than the capability on the start, then it gives upward push to the capacity voltage drop.

Does Voltage Drop Over Distance?

The space is without delay proportional to the resistance and while the resistance will increase, the Voltage drop can even get most.

How Do You prevent Voltage Drop?

  • The temperature of the conductor must be decreased to enough/li>
  • The period of the conductor have to be decreased
  • lessen the power load voltage related to the circuit
  • Increasing the variety of the conductors connected in the circuit

You have to keep checking the drop with the calculator to analyze higher.

American twine Gauge (AWG) Sizes:

AWG Diameter Turns of cable Area Copper resistance
inch mm per inch per cm kcmil mm2 Ω/km Ω/1000ft
0000 (4/0) 0.4600 11.684 2.17 0.856 212 107 0.1608 0.04901
000 (3/0) 0.4096 10.404 2.44 0.961 168 85.0 0.2028 0.06180
00 (2/0) 0.3648 9.266 2.74 1.08 133 67.4 0.2557 0.07793
0 (1/0) 0.3249 8.252 3.08 1.21 106 53.5 0.3224 0.09827
1 0.2893 7.348 3.46 1.36 83.7 42.4 0.4066 0.1239
2 0.2576 6.544 3.88 1.53 66.4 33.6 0.5127 0.1563
3 0.2294 5.827 4.36 1.72 52.6 26.7 0.6465 0.1970
4 0.2043 5.189 4.89 1.93 41.7 21.2 0.8152 0.2485
5 0.1819 4.621 5.50 2.16 33.1 16.8 1.028 0.3133
6 0.1620 4.115 6.17 2.43 26.3 13.3 1.296 0.3951
7 0.1443 3.665 6.93 2.73 20.8 10.5 1.634 0.4982
8 0.1285 3.264 7.78 3.06 16.5 8.37 2.061 0.6282
9 0.1144 2.906 8.74 3.44 13.1 6.63 2.599 0.7921
10 0.1019 2.588 9.81 3.86 10.4 5.26 3.277 0.9989
11 0.0907 2.305 11.0 4.34 8.23 4.17 4.132 1.260
12 0.0808 2.053 12.4 4.87 6.53 3.31 5.211 1.588
13 0.0720 1.828 13.9 5.47 5.18 2.62 6.571 2.003
14 0.0641 1.628 15.6 6.14 4.11 2.08 8.286 2.525
15 0.0571 1.450 17.5 6.90 3.26 1.65 10.45 3.184
16 0.0508 1.291 19.7 7.75 2.58 1.31 13.17 4.016
17 0.0453 1.150 22.1 8.70 2.05 1.04 16.61 5.064
18 0.0403 1.024 24.8 9.77 1.62 0.823 20.95 6.385
19 0.0359 0.912 27.9 11.0 1.29 0.653 26.42 8.051
20 0.0320 0.812 31.3 12.3 1.02 0.518 33.31 10.15
21 0.0285 0.723 35.1 13.8 0.810 0.410 42.00 12.80
22 0.0253 0.644 39.5 15.5 0.642 0.326 52.96 16.14
23 0.0226 0.573 44.3 17.4 0.509 0.258 66.79 20.36
24 0.0201 0.511 49.7 19.6 0.404 0.205 84.22 25.67
25 0.0179 0.455 55.9 22.0 0.320 0.162 106.2 32.37
26 0.0159 0.405 62.7 24.7 0.254 0.129 133.9 40.81
27 0.0142 0.361 70.4 27.7 0.202 0.102 168.9 51.47
28 0.0126 0.321 79.1 31.1 0.160 0.0810 212.9 64.90
29 0.0113 0.286 88.8 35.0 0.127 0.0642 268.5 81.84
30 0.0100 0.255 99.7 39.3 0.101 0.0509 338.6 103.2
31 0.00893 0.227 112 44.1 0.0797 0.0404 426.9 130.1
32 0.00795 0.202 126 49.5 0.0632 0.0320 538.3 164.1
33 0.00708 0.180 141 55.6 0.0501 0.0254 678.8 206.9
34 0.00630 0.160 159 62.4 0.0398 0.0201 856.0 260.9
35 0.00561 0.143 178 70.1 0.0315 0.0160 1079 329.0
36 0.00500 0.127 200 78.7 0.0250 0.0127 1361 414.8
37 0.00445 0.113 225 88.4 0.0198 0.0100 1716 523.1
38 0.00397 0.101 252 99.3 0.0157 0.00797 2164 659.6
39 0.00353 0.0897 283 111 0.0125 0.00632 2729 831.8
40 0.00314 0.0799 318 125 0.00989 0.00501 3441 1049

What is the importance of voltage drop.

The reduction in electrical voltage is referred to as a voltage drop. The resistance of the wire can cause inefficient performance of electrical devices. Appliances and electrical systems may not work properly if the voltage drops too much. In long electrical circuits resistance increases with distance. In industrial settings excessive voltage drop can lead to overheating. It's important to calculate the voltage drop to prevent power inefficiencies and electrical dangers. Electricians and engineers use voltage drop calculations to improve wiring for homes, businesses and power grids. Understanding voltage drop can help maintain electrical efficiency, prevent damage to appliances, and ensure safety in electrical installations.

How can I tell the difference.

The formula V is used to calculate the voltage drop, I is the current in amperes, and R is the resistance of the conductor. In this formula, length is the one-way distance of the wire. Resistance can be affected by wire material, gauge size, and temperature. If a circuit carries 10A of current through a wire with a resistance of less than 0. 25, the voltage drop would be less than 5V. Ensuring the right wire size reduces energy loss when there is a high voltage drop. This calculator makes it easier to design efficient electrical systems.

What are the factors that affect the voltage drop.

The factors that influence voltage drop are wire length, wire gauge, material type, current load, and temperature. The longer wires have a higher resistance. The thicker wires reduce resistance. Compared to aluminum, copper wires are better conductors. Larger wires are needed for high-power devices because of the higher electrical loads. The higher the temperature, the greater the voltage drop. Proper consideration of these factors ensures efficient power delivery and prevents overheating. When designing electrical systems, professionals choose the right wire sizes and materials.

How can I reduce the electrical system's voltage drop.

Choosing thicker wires (lower gauge), using shorter wire lengths, selecting high-conductivity materials like copper, and ensuring proper connections can all be used to reduce voltage drop. The thicker the wires, the better the current flow. The resistance that causes voltage loss is minimized by shorter wires. Because they conduct electricity more efficiently, copper conductors are preferred. Distribution of power across multiple circuits can help reduce electrical load. The electrical connections need to be tightened to ensure minimal resistance at joints. Transformer and voltage regulators are used in industrial and commercial settings. By implementing these measures, electrical systems are able to operate more efficiently.

Why does long-distance electrical wiring have an issue with voltage.

Resistance increases with wire length, which leads to a major problem in long-distance electrical wiring. The longer the wire, the more power is lost before it reaches the end device. This can lead to inefficiency or even failure at appliances. In rural areas or large buildings, long cable runs can lead to excessive voltage drop. Higher voltage systems are used to compensate for the loss. Solar power systems, outdoor lighting, and industrial applications all require careful voltage drop calculations. If not managed, excessive voltage drop can lead to reduced lifespans of electrical components, motor overheating, and increased energy costs. Stable and efficient electrical performance is ensured by managing the voltage drop.