voltage drop calc to the farest outlet

[Toros]

Hi,
Any body knows how to calculate the voltage drop percent. Of feeder from 800a single phase service to farest 20/120v outlet
Initati.g from service via 100 feet of 3#2 thhn.cu to sub panel than with 3#12 wire to that outldt
B

 

[iwire]

You need to know the current on each section.

 

[GoldDigger]

You need to know the current on each section.

Edwardtomas: For the worst case calculation, assume that the feeder part of the wiring is carrying the full allowed current of the subpanel and that the branch part of the wiring is carrying the full current allowed by the branch circuit overcurrent protection.
Then add in whatever voltage drop you would get from the service wiring if you drew the full 800A.

Since you have a 120V load, you need to calculate the voltage drop on both L1 and N conductors.

 

[Gregg Harris]

Hi,
Any body knows how to calculate the voltage drop percent. Of feeder from 800a single phase service to farest 20/120v outlet
Initati.g from service via 100 feet of 3#2 thhn.cu to sub panel than with 3#12 wire to that outldt
B

Can you clear up your info?

It appears 100 feet is the distance, copper, 20 amp, 120 volt and are you attempting to parallel the conductors?

 

[GoldDigger]

Can you clear up your info?

It appears 100 feet is the distance, copper, 20 amp, 120 volt and are you attempting to parallel the conductors?

Maybe just plain 120/240 three-wire? But the length of the branch wiring was not specified.