Voltage drop

[Josh Cipolla]

Does free air differ from direct burial when calculating the voltage drop of a long run?
i have 450' over head in free air what size al wire can I use to get between 3-4% voltage drop?
thank you

 

[GoldDigger]

The voltage drop will not be affected enough to matter as long as the conductor temperature is within its rating. But the calculated ampacity will be different.

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[Josh Cipolla]

It would be for a 200 amp 240v panel
3 phase

 

[GoldDigger]

It would be for a 200 amp 240v panel
3 phase

The rating of the panel is not as important as what the actual load will be.
If you size the conductors for low VD at 200A you are probably spending too much.