What is the typical wire gauge used to feed a 200amp residential panel?

4/0AL or 2/0CU

3/0 copper is 200A wire

2/0 is 175A---too small

3/0 copper is 200A wire

2/0 is 175A---too smallAre you serious?
You did see that the OP states "residential panel", right? And since it is 200A I highly doubt it is a sub-panel.

Are you serious?
You did see that the OP states "residential panel", right? And since it is 200A I highly doubt it is a sub-panel.

Sho nuff, though I DID type 175A when I meant THHN which is 195A, 195 ain't 200 even if it wasn't a residential panel

Wow, are you an electrician?

Ever hear of 310.15(B)(6) in the 2008 and earlier NEC?

Table 310.15(B)(7) in the 2011.

Wow, are you an electrician?

Ever hear of 310.15(B)(6) in the 2008 and earlier NEC?

Yeah, bud. I AM an electrician, I used the ampacity tables (table 310.16), not the "permitted' table exclusive to residential services like you did.
That's fine if you're going to take an anonymous poster's word ( who doesn't know how to look it up) that it is a residential service.
Also I take into account that people read this stuff that aren't electricians and may think that 2/0 is OK for ANY 200A feeder... which it's NOT.
And there is also the difference between a good job and going for the absolute minimum like a hack does.

So before you question my answer you might try thinking like a grownup, I didn't question how long you may have been doing this or what the EXTENT of your experience might be either, did I? I don't get all my answers out of books.

Whoa, easy there little boy. All I asked was if you were an electrician.

And yes, when a poster asks about a residential service I tend to believe them that it is indeed a residential service they are asking about. Especially on a forum called 'Home > Home & Garden > Electrical & Lighting'. If they misapply this to a commercial job that is not my problem.

310.16(B)(7) is not only the 'permitted' table for sizing residential service conductors, it is THE table to use for sizing residential service conductors. It's not that anyone who uses that is a hack, it's that if you are not you are a fool!
Also, if you think using 310.16(B(7) is 'hack' because it is the 'absolute minimum' then you are also an elitist who thinks unnecessarily over-building a job somehow makes you better. I guaranty you, you are not.