mbrooke
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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:
2-2-2-4 AL SER ampacity
- Thread starter mbrooke
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- Chapel Hill, NC
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It depends on how it is used. Is this a feeder for the entire home or is it run thru insulation?
MasterTheNEC
CEO and President of Electrical Code Academy, Inc.
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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:
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- New Jersey
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Is it installed within insulation?
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- Chapel Hill, NC
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- Retired Electrical Contractor
#2 at 75C is 90 amps but at 60C which is often what you must use it is rated 75 amps
mbrooke
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Should have been more specific. 2005, 2008, 2011:lol:
This is a genuine subpanel feeder, so the entire dwelling load is not on it.
mbrooke
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Small section goes through R-14 fiberglass insulation, the other part runs on basement rafters. Feeder comes from the 200amp basement panel with main disconnect.
MasterTheNEC
CEO and President of Electrical Code Academy, Inc.
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- McKinney, Texas
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Check out 338.10(B)(4) and it will be helpful to you in your quest.
Man, I sound like Confucius or something...gesh
Man, I sound like Confucius or something...gesh
mbrooke
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- Chapel Hill, NC
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- Retired Electrical Contractor
Yep
mbrooke
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That would mean 75 amps. Does the next size up rule still hold, or do I have to use a 70amp breaker?
jetlag
Senior Member
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- Eatonton, Georgia
100 amp for service entrance
100 amp for service entrance
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 .
100 amp for service entrance
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 .
MasterTheNEC
CEO and President of Electrical Code Academy, Inc.
- Location
- McKinney, Texas
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- CEO
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
Sierrasparky
Senior Member
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- USA
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- Electrician ,contractor
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.
mbrooke
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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:
jetlag
Senior Member
- Location
- Eatonton, Georgia
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 .
Sierrasparky
Senior Member
- Location
- USA
- Occupation
- Electrician ,contractor
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.
- Occupation
- Licensed Electrician
You can use an 80A breaker as long as your load is not more than 75A.
mbrooke
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jetlag
Senior Member
- Location
- Eatonton, Georgia
sub panel
sub panel
I agree with all that , you know a lot of outside disconnects have a few breaker spaces . We use those all the time in rural area for the well pump and storage buildings . I know , that means entire load is no longer on the sub-panel . I have never seen any one get flagged by the inspector for that. I assumed he had a 200 amp main panel and was not connecting a 100 amp sub to a 100 amp main panel , but like you say in that case the ser could be the same for both.
sub panel
I agree with all that , you know a lot of outside disconnects have a few breaker spaces . We use those all the time in rural area for the well pump and storage buildings . I know , that means entire load is no longer on the sub-panel . I have never seen any one get flagged by the inspector for that. I assumed he had a 200 amp main panel and was not connecting a 100 amp sub to a 100 amp main panel , but like you say in that case the ser could be the same for both.
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