How many #12 ccc in a conduit add still terminate on a 20 amp breaker.

[nolondant]

I have 4 # 12 THHN phase conductors each has a netural conductor, these conductors are dedicated to computers. After ampacity adjustment factors have been applied to these conductors, will I still be able to terminate these conductors on a 20 amp breaker.

 

[Dennis Alwon]

I have 4 # 12 THHN phase conductors each has a netural conductor, these conductors are dedicated to computers. After ampacity adjustment factors have been applied to these conductors, will I still be able to terminate these conductors on a 20 amp breaker.

What do you think. Let's see a little math then we will help you out.

 

[infinity]

The answer has appeared here numerous times. Like Dennis asked, what do you think the answer is?

Welcome to the Forum.

 

[iwire]

The Beatles even did a song about it.

 

[480sparky]

>3, <100.

 

[nolondant]

6 CCC is all you can have because of the 75 degree terminals on the breaker. 7 CCC would only be good for 17.5 amps after derating. You would not be able to terminate a conductor rated for 17.5 amps on a 20 amp breaker. The contractor wanted a more professional opinion. Please help.

 

[Dennis Alwon]

6 CCC is all you can have because of the 75 degree terminals on the breaker. 7 CCC would only be good for 17.5 amps after derating. You would not be able to terminate a conductor rated for 17.5 amps on a 20 amp breaker. The contractor wanted a more professional opinion. Please help.

Look at T310.15(B)(2). You can have 9 conductors with a 70% reduction. You can use the 90C table for derating. 12 @ 90C is 30 amps. 70% of 30= 21 amps.

 

[billsnuff]

for dennis

for dennis

Oversize gold star removed by moderator

 

[Dennis Alwon]

Oversize gold star removed by moderator

Thanks Bill

 

[charlie b]

The Beatles even did a song about it.

"Nine days a week"? :-?

 

[Dennis Alwon]

"Nine days a week"? :-?

What you never heard that song?

 

[billsnuff]

Thanks charlie, didn't realize it was THAT big.

Sorry......

 

[Jim W in Tampa]

The Beatles even did a song about it.

As a DJ i simply will not play there songs.

 

[iwire]

"Nine days a week"? :-?

Well it sure was not one of the hits.

Revolution 9

 

[charlie b]

Thanks charlie, didn't realize it was THAT big.

Thank Bob. I didn't do it.

 

[LarryFine]

"Nine days a week"? :-?

Is that like Santa's ninth reindeer, Olive?

 

[charlie b]

Is that like Santa's ninth reindeer, Olive?

I think you meant tenth, and don't call me "Olive."