what is the formula of the voltage drop
Answers
Voltage Drop Formula
Voltage drop specifies how the supplied energy from a voltage source is reduced as electric current flows through the elements that do not supply voltage (passive elements) of the electrical circuits. The voltage drop across conductors, across connectors and internal resistances of the source are unwanted since the supply energy is lost. The voltage drop across active circuit elements and loads are desired, since supplied power performs efficient work.
The voltage drop formula is given by,
V = I Z
Where,
I = Current in amperes
Z = impedance in Ω
Similarly,
The single phase voltage drop formula is given by,
VD = 2 LRI / 1000
The three phase voltage drop formula is given by,
VD = 2 LRI / 1000 x 0.866
Where
L = length of the circuit
R = resistance in Ω,
I = load current in amperes.
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Answer:
Explanation:
Voltage drop is only mentioned in some sections of the NEC as informational notes, and is required to be calculated in other sections of the Code. These sections are 210.19(A) Informational Note 4, 215.2(A)(1) Informational Notes 2 and 3, 310.15(A)(1) Informational Note 1, 647.4(D), 310.60(B) Informational Note 2, 455.6(A) Informational Note, and 695.7. Permitted or required amounts of voltage drop may range from 1.5 to 15 percent of the feeder or branch-circuit voltage. Five percent maximum is generally suggested on a circuit. Informational notes are not mandatory Code requirements, but are explanatory material intended for informational purposes only [see 90.5(C)].