voltage drop formula

[eager2learn]

i would like to know the formula for voltage drop
single phase
and
three phase
please

 

[infinity]

Take a look here:

http://www.mikeholt.com/technical.php?id=calculations/technicalcalculationformulas

 

[tlaidman]

formula

VD= 2KLI/cm


K=12.9 (constant for copper)
L = length
I = current
CM = circular mils

 

[billsnuff]

3 ph

3 ph

Vd = 1.73K x L x I / Cm

 

[Smart $]

http://www.dolphins-software.com/voltageDrop.htm

 

[celtic]

Here are the "cheat sheets"

Voltage Drop

Voltage Drop for any voltage

Minimum conductor Size for Given Voltage Drop

Maximum Length for Given Voltage Drop



....all in one spot: Electrician Calculators
:grin:

 

[ZElectric]

Voltage Drop Calculation Sheet

Voltage Drop Calculation Sheet

I put together a spread sheet that calculates for me in excel. It works great. I use it anytime long runs to a motor is required. It has save me a lot of headaches. I would attach it if I were allowed.

 

[Full Spool]

VD= (2xRxIxL)/1000

VD=voltage drop
R=resistance
I=Amps
L=Length of the run