How can I compute voltage drop and cable size over distance?

This is calculator for the voltage drop of an eletrical circuit based on the wire size and load current.  

VD=I×(2×L×R/1000)

This calculator assume the circuit is operate in a normal condition room temperature with normal frequency.The actual voltage drop can vary depend on the condition of the wire, the conduit being used the temperature the connector the frequency etc.

its simple get a high quality wire and use stabilizer for more

1. this is the calculation of voltage drop of an electrical circuit based on the size of wire, distance and anticipated load current

wire material

wire size

voltage

phase

number of conductor

distance

load current

Hi,

To compute the voltage drop and cable size, you require the folowing data.

1) The total load you wish to run with the concerned cable.

2) Corresponding current for that particulat load. (To be on a safer side you can assume 2 times the load in kW or else you can apply the formula for power to get the exact current)

3)Once you know how much current the cable is gonna carry you can easily finalize the rating of protection device (ACB,MCCB, etc.,).

4)For the time being you can assume the standard cable size corresponding to your switchgear rating and as per your auhtority standards.

5)Length of the cable from the starting end to receiving end.

6)Voltage drop/Ampre/Metre which you will get from the cable supplier (in mV).

Once you get all the above data, the voltage drop can be calculated as follows.

Voltage drop=(voltage drop/ampere/metre)xlengthxcurrent. This will be in mV. Just divide by 1000 to get the voltage drop in volts.

Hope this clarifies your question.

Regards,

Dipin