Voltage Drop?

[cesranger]

I am installing a 800 amp, 480 volt, three phase power panel. I am going to pull three, 3/C, 350 mcm amor clad cables to feed this panel at a distance of 625 ft per run. The three cables total amp cap. are 930. This should take care of voltage drop, am I correct? Thanks for the help..

 

[mayanees]

I did a quick voltage drop (VD) calc on 625' of 3 sets of 350kcm per phase using a load of 640 amps at 0.8 pf and see a resultant VD of 3.1%.
As long as the panel your feeding doesn't have significant motor loads that could impress starting current on the panel while it's already loaded I think your sizing is adequate.
John M

 

[cpal]

did to check 250.122 (B)??

 

[cesranger]

Thanks John and Charlie!

 

[RICK NAPIER]

Here is a site that will help you in futture voltage drop calculations.

http://www.electrician2.com/vd_calculator.htm

 

[gilamor]

Electrician Santa Monica

Electrician Santa Monica

Here is another calculator
http://www.csgnetwork.com/voltagedropcalc.html
http://www.amorelectric.com/