Derated Ampacity of Cable - Breaker Size

[designer82]

If I have a 1200 Amp breaker protecting a cable. Should the base or derated ampacity of that cable be at least 1200 Amps?

 

[Dsg319]

Yes, next size up rule ends at 800amperes.

 

[augie47]

There are a few limited exceptions most particularly those listed in 240.4(G) such as motors but, generally, what Dsg319 states..

 

[infinity]

Should the base or derated ampacity of that cable be at least 1200 Amps?

For most installations in both cases it's required to be 1200 amps or larger.

 

[GoldDigger]

For most installations in both cases it's required to be 1200 amps or larger.

One exception would be if there is an applicable tap rule.