The drop calculations presented in this spreadsheet were all based on the resistance values shown in Chapter 9 Table 8 of the National Electric Code. The only thing considered in this spreadsheet is voltage drop.
There are many other factors that have an impact on wire size. When sizing wire, you should refer to the entire National Electric Code. As well as the main spreadsheet containing the calculations, this tool has 3 more sheets alongside.
Do not only consider Voltage Drop Calculations and Table 310.16 when sizing conductors. It is necessary that you consider many other factors such as:
- the ambient temperature
- the type of insulation
- the type of load
- the temperature rating of the equipment
- the size of the breaker
- the type of environment
- continuous load
- the type of circuit
This spreadsheet should be used to calculate voltage drop. Refer to NEC to size wires.
Reference: https://en.wikipedia.org/wiki/Voltage_drop
Calculate Voltage of Cable having Different Size
Calculate Starting Current
Calculate Running Current
Calculate Starting Voltage Drop
Calculate Running Voltage Drop
Title : Size of Cables Voltage Drop Calculation
Type : Microsoft Excel Spreadsheet (xlsx)
Size : 48.0 KB
FAQ:
How do you calculate voltage drop for cable sizing?
To calculate the voltage drop for a circuit as a percentage, multiply the current (amps) by the cable length (metres); then divide this number by the value in the table. For example, a 30m run of 6mm2 cable carrying 3 phase 32A will result in 1.5% drop: 32A x 30m = 960Am / 615 = 1.5%.
How do you calculate the voltage drop across a wire?
How to Calculate Voltage Drop – Formula and Examples
One of the basic principles of electrical engineering is Ohm’s law, which states that the voltage drop across a conductor or load is equivalent to the product of current and resistance (V = I x R).
Does cable size affect voltage drop?
The voltage drop percentage is dependent on the length of the wire, the gauge of the wire, and the current draw of your fixture. Generally speaking, the thicker the gauge of your wire, the more power can travel through, and you’ll have a lower voltage drop percentage.
