I have a question about current

[Sparky_Dee]

If you have a 4/0 AWG conductor that is connected to a circuit breaker in a 120/208-volt, 3 ph, 4-wire panelboard, how many amps of current can it carry inside the panel?

 

[ActionDave]

Welcome to the forum.

Can you restate or expand your question? Right now what you are asking is too broad to give an accurate answer.

 

[480sparky]

Sounds like a test question that's really looking for your knowledge of terminal temperature ratings. But as for the ampacity of the conductor itself, lacking what type of insulation is has there's no possible answer.

 

[electrofelon]

conductor material would be nice to know too

 

[480sparky]

conductor material would be nice to know too

Unless specified, you assume copper.

 

[infinity]

Since it's #4/0 I would assume that it's a 75° conductor for ampacity purposes due to 110.14.(C)(1)(b).

 

[480sparky]

Ignore........

 

[Little Bill]

You won't find many breakers, other than a main, that will accept a 4/0 conductor.

 

[petersonra]

If you have a 4/0 AWG conductor that is connected to a circuit breaker in a 120/208-volt, 3 ph, 4-wire panelboard, how many amps of current can it carry inside the panel?

I don't get the "inside the panel" part of your question. The code will tell you what the ampacity of the conductor is. It will likely be the same inside the panel as in the conduit running to it, short of the conduit having a bunch of other current carrying conductors in it.