4/0 AL wire ok for commercial 200 amp question

[Stevenfyeager]

The inspector tells me that 4/0 AL is good for 200 amp dwellings and commercial jobs both Because of the next size up breaker rule. But we cannot use the same 2/0 copper for dwellings and commercial jobs. NEC says copper is only good for 175 and there is a 175 breaker but AL is good for 180 and so since there is no 180 breaker we can use the 200 amp breaker for commercial. Does this sound correct?

 

[Little Bill]

Yes, but the load is limited to 180A.

 

[Cow]

There is a fine line between saying you can install it on a 200 amp breaker and saying it is good for 200 amps.

 

[petersonra]

The inspector tells me that 4/0 AL is good for 200 amp dwellings and commercial jobs both Because of the next size up breaker rule. But we cannot use the same 2/0 copper for dwellings and commercial jobs. NEC says copper is only good for 175 and there is a 175 breaker but AL is good for 180 and so since there is no 180 breaker we can use the 200 amp breaker for commercial. Does this sound correct?

take a look at table 240.6.