voltage drop calculator

[101010]

When you use these voltage drop calculators , when it says half the lenght for a 120v circuit this means use the lenght of the pipe right? Meaning if you have a 300 ft run that is the # you put in, not 150ft.

 

[infinity]

When you use these voltage drop calculators , when it says half the lenght for a 120v circuit this means use the lenght of the pipe right? Meaning if you have a 300 ft run that is the # you put in, not 150ft.

Which calc are you using? Some of them specify that the length is a one way distance like this one:

Please enter your values:

120 Volts Copper Single Phase
208 Volts Aluminum Three Phase
240 Volts
277 Volts
480 Volts
Distance in feet, one-way
Total amperage of circuit
This is your minimum wire size.​

http://www.elec-toolbox.com/calculators/voltdrop.htm​

 

[101010]

The one I am using says half the lenght . Which means if the pipe is 3oo ft long that is the distance you use not 600 ft because of the return right?

 

[Dennis Alwon]

The one I am using says half the lenght . Which means if the pipe is 3oo ft long that is the distance you use not 600 ft because of the return right?

Not sure try 150' and see if it correlates with the online calc. posted

 

[infinity]

If you were to calculate the VD using the formula method you would use the total conductor length, meaning the length going to and returning from the load. Some of the VD calc's already factor that in so you only need to enter the one way distance of the conductors. One way input is easier IMO since you only need to figure out how far apart the source and the load are from each other.