[jhsatt667]

Have 200 amp service. Installing a subpanel in attached garage. Distance is 35 feet. 17 feet in attic. 60 amp breaker in main box. 100 amp breaker in subpanel(used as disconnect). Running 6-3 romex. Seperate ground and neutral. No ground rod at subpanel. Sound OK? thanks

 

[mterry]

Sounds kosher to me

 

[TTW]

Looks good to me 6-3 romex - w G should be good up to 80 amps.

 

[k_buz]

Looks good to me 6-3 romex - w G should be good up to 80 amps.

Nope, only good to 55 Amps. Depending on what you are installing in the sub panel, use a 50A breaker.

 

[TTW]

55 amps by table 310.15(B)(16) in raceway cable or earth
80 amps by table 310.15(B)(17) free air

I think I used the wrong table. I stand corrected, thank you.

 

[jbfan]

Romex is limited to the 60 degree column

 

[diystephen]

Have 200 amp service. Installing a subpanel in attached garage. Distance is 35 feet. 17 feet in attic. 60 amp breaker in main box. 100 amp breaker in subpanel(used as disconnect). Running 6-3 romex. Seperate ground and neutral. No ground rod at subpanel. Sound OK? thanks

In addition to replacing the 60 amp with a 50 amp, this leads to an interesting question. Can a 100 amp breaker be used in the sub as a disco when the feeder breaker (and wire) is not 100 amp?

 

[jbfan]

In addition to replacing the 60 amp with a 50 amp, this leads to an interesting question. Can a 100 amp breaker be used in the sub as a disco when the feeder breaker (and wire) is not 100 amp?

Not a problem, and you can use the 60 amp breaker, because there is not a 55 amp breaker.

 

[diystephen]

Not a problem, and you can use the 60 amp breaker, because there is not a 55 amp breaker.

Thanks for the info, I've always matched the subpanel breaker to the feeder breaker (when they wanted a sub disco.) Do you happen to know the code reference on that one?

 

[jbfan]

Thanks for the info, I've always matched the subpanel breaker to the feeder breaker (when they wanted a sub disco.) Do you happen to know the code reference on that one?

Somewhere in the office, and football is on.:whistling2:


As long as the wire feeding the panel is properly protected, you can have any size breaker in the panel.

 

[Stubbie]

Thanks for the info, I've always matched the subpanel breaker to the feeder breaker (when they wanted a sub disco.) Do you happen to know the code reference on that one?

240.4(b) 2008 NEC
408.36 2008 NEC