mbrooke
Batteries Included
- Location
- United States
- Occupation
- Technician
Ok, so anyone know the ampere rating of #2AL in the 2014? So far from older code cycles I am getting 90, 80, and 75amps. :blink:
Not sure which version you are considering old...but i have the 2008, 2011, and 2014 sitting here and all show 75, 90, and 100 depending on the temperature ratings (60,75 or 90). Now I won't speculate on anything other than basically what you are asking...because when i do...whamo...i get opened up for anything...:roll:
It depends on how it is used. Is this a feeder for the entire home or is it run thru insulation?
Check out 338.10(B)(4) and it will be helpful to you in your quest.
Man, I sound like Confucius or something...gesh
So insulation forces the use of the 60 degree column?
umm....wait.....reverse that Mr. Wonka#2 at 75C is 90 amps but at 60C which is often what you must use it is rated 75 amps
You can use 2-2-2-4 for a 100 amp service entrance because they let you go one size under on that because everything is not likely to be ran all at once . For a sub-panel they don't cut you any slack . Around here if you put a 90 amp breaker for the sub-panel they tend to ignore the insulation type .
umm....wait.....reverse that Mr. Wonka
2 AWG at 90C is 100 amps but at 75C which is often what you must use it is rated 90 amps
You are correct , it doesn't say no for sub panel exactly . When I said service entrance I meant with or without an outside disconnect . I know with a separate disconnect the box would would become a sub-panel . It is still considered the main panel. If you leave from the main to another panel is when they frown on the 100 amp . Don't forget if they get nit pic with you , you might have to drop the insulation rating down one since ser is enclosed in an outer sheath .Well sort of!
Where does it say no for a sub panel.
As long as the sub panel carries the entire load of the dwelling is served by this feeder then #2 AL 100 amps is OK for a sub panel too.
For example :
Service (meter/ Main) to sub in dwelling.
You are correct , it doesn't say no for sub panel exactly . When I said service entrance I meant with or without an outside disconnect . I know with a separate disconnect the box would would become a sub-panel . It is still considered the main panel. If you leave from the main to another panel is when they frown on the 100 amp . Don't forget if they get nit pic with you , you might have to drop the insulation rating down one since ser is enclosed in an outer sheath .
You can use an 80A breaker as long as your load is not more than 75A.And this assumes no insulation around the cable assembly?
But, when I use the 60 degree column, does that mean I use a 70 or 80 amp breaker since it comes out as 75 amps?
Sorry for all the head scratching:lol::ashamed1:
You can use an 80A breaker as long as your load is not more than 75A.
You can have a Sub panel 50 feet away. it still would be compliant as long as the entire load is on that feeder. ( depends on the code cycle)
Years ago it was ok even if you had other loads. Furthermore you never have to be larger than the service conductors.