Sizing conductors for underground service

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howardrichman

Senior Member
I'll be installing a 200 amp underground service, total run transformer on pole to terminals of meter pan average voltage drop approx. 410 ft. average I'de run 3 4/0 aluminum conductors. Considering the run, Would I calculate a minimum voltage drop and run 3- 250 or 350 MCM conductors considering 2 compressor loads?

HR...
 

howardrichman

Senior Member
I'll be installing a 200 amp underground single phase residential service, total run transformer on pole to terminals of meter pan average voltage drop approx. 410 ft. average I'de run 3 4/0 aluminum conductors. Considering the run, Would I calculate a minimum voltage drop and run 3- 250 or 350 MCM conductors considering 2 compressor loads?
HR...[/QUOTE]
 

howardrichman

Senior Member
4/0 is likely fine. I could be talked into running 250MCM. No way I would run 350. I would for sure reduce the neutral.

Thank you for reply. I'm contacting local power company for a price also to compare to what it would cost me to dig trench, supply and install material, and remove the existing pole in yard.

HR...
 

kwired

Electron manager
Location
NE Nebraska
If I determined I needed more conductor I'd likely run parallel 4/0 instead of 350.

Material wise may cost less or may not - but often is less simply because of higher bulk quantities purchased by the suppliers for those size conductors as well as raceways. And 4/0 is less back breaking to handle the 350. You also get more CSA out of two 4/0 then a single 350. Two 3/0 gets you close to a 350 - but no supplier ever has 3/0 aluminum, but usually has a lot of 4/0.
 

jumper

Senior Member
If I determined I needed more conductor I'd likely run parallel 4/0 instead of 350.

Material wise may cost less or may not - but often is less simply because of higher bulk quantities purchased by the suppliers for those size conductors as well as raceways. And 4/0 is less back breaking to handle the 350. You also get more CSA out of two 4/0 then a single 350. Two 3/0 gets you close to a 350 - but no supplier ever has 3/0 aluminum, but usually has a lot of 4/0.

CSA?
 
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