200 Amp Service-Feeder Size

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kencoel

Member
New 200 Amp Three Phase Service aprox. 180' from the main to new location.
2/0 or 3/0? THHN. NEC seems to differ according to Degrees. It seem that THHN is listed at 90 Degrees, so should I install 3/0?
 

roger

Moderator
Staff member
Location
Fl
Occupation
Retired Electrician
You will have to use the 75 deg rating unless you have some extraordinary service equipment. :)

Roger
 

Dennis Alwon

Moderator
Staff member
Location
Chapel Hill, NC
Occupation
Retired Electrical Contractor
New 200 Amp Three Phase Service aprox. 180' from the main to new location.
2/0 or 3/0? THHN. NEC seems to differ according to Degrees. It seem that THHN is listed at 90 Degrees, so should I install 3/0?

You may also want to think about voltage drop for 180'.
 

kwired

Electron manager
Location
NE Nebraska
Interesting that the OP refers to it as a service feeder, and that it comes from the main.

That would imply to me it is not really service equipment.

Or he is just confused with the correct terminology. If his 'main' does not contain an overcurrent device it is still service conductors.

If this line qualifies to use Table 310.15(B)(6) then 2/0 is acceptable.
 
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