# Blog

## How do you calculate voltage drop in a circuit? ## How to validate the voltage drop of a DC loop?

• In order to validate the voltage drop, Ohm’s law and Kirchhoff’s circuit law are widely-used as indicated below. For DC looped circuits, we likewise apply Kirchhoff’s circuit law for voltage drop calculation. It is done as follows: Supply Voltage = Total of the voltage drop across every single element of the circuit.

## What is the acceptable voltage drop for feeder circuit?

• According to the NEC (National Electric Code) [210.19 A (1)] FPN number 4 and [215.2 A (3)] FPN number 2, the allowable Voltage drop for feeders is 3% and the acceptable voltage drop for final sub circuit and branch circuit is 5% for proper and efficient operation. For example,...

## How to calculate voltage drop using Kirchhoff's Circuit law?

• For DC looped circuits, we likewise apply Kirchhoff’s circuit law for voltage drop calculation. It is done as follows: Supply Voltage = Total of the voltage drop across every single element of the circuit. In this article, let's take the illustration of 100 ft power line. Therefore, for just two lines, 2 × 100 ft.  