# electrical voltage drop

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Voltage Drop Calculator | Southwire Voltage Drop Calculator Helps determine the proper wire size for an electrical circuit based on the voltage drop and current carrying capacity of an electrical circuit. Voltage Drop Calculator Voltage drop becomes important when the length of a run of wire or cable becomes very long. Usually this is not a problem in circuits within a house, but may become an issue when running wire to an outbuilding, well pump, etc. Excessive voltage drop can cause loss of efficiency in operation of light, motors and appliances. The basics of calculating voltage drop | Electrical ... The National Electrical Code, 210 19(a) (FPN 4) and 215 2 (b) (FPN 3), recommends 5% voltage drop for feeder circuits and 3% for branch circuits. Let's work some examples, using the equations in the sidebar (right). Our examples use uncoated copper wire in steel conduit, for 480V branch circuits; we'll use NEC Table 9's power factor column. Voltage Drop Calculator Wire Size Calculator 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. The National Electrical Code states that the voltage drop of a feeder circuit must not exceed 5%, and the voltage drop of a branch circuit must not exceed 3%. Voltage Drop Calculator RAPID TABLES 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 resistance per 1000 feet R in ohms (Ω kft) divided by 1000: V drop (V) = I wire (A) × R wire (Ω) Voltage Drop in Electric Circuits Engineering ToolBox Voltage drop in an electric circuit can be calculated using Ohm's law as. U = R I (1) where . U = voltage drop (volts, V) R = electrical resistance in the electric circuit (ohms, Ω) I = current (amps, A) Example Voltage Drop. Voltage drop in a 100 ft power line: 2 x 100 ft #10 copper ; electrical resistance 1.02 Ω 1000 ft ; current 10 amps Voltage Drop Calculation Based on National Electrical Code ... The National Electrical Code (NEC) provide basic method in calculating voltage drop in the system. This code provides data of standard conductor properties that can be used in voltage drop calculation.