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02-26-2011, 11:10 PM
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#1
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Junior Member
Join Date: Feb 2011
Location: colorado
Posts: 4
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ampacity
What size aluminum SER cable do you need to feed an 100 amp sub panel in a residence?
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02-26-2011, 11:43 PM
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#2
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Heavily Armed Member
Join Date: Sep 2010
Location: Fascistchusetts
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Quote:
Originally Posted by yetti
What size aluminum SER cable do you need to feed an 100 amp sub panel in a residence?
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Take a look at 310.15(B)(7) table...#4 copper.. 
Welcome to the forum you will have fun here and learn something too... 
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02-26-2011, 11:44 PM
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#3
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Senior Member
Join Date: May 2009
Location: Depoe Bay, Oregon
Posts: 9,931
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Quote:
Originally Posted by HARRY304E
Take a look at 310.15(B)(7) table...#4 copper.. |
He said aluminum, Harry 
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02-27-2011, 12:08 AM
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#4
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Senior Member
Join Date: Sep 2009
Location: WA
Posts: 4,064
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That table only applies if the panel is on the main feeder to the unit.
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02-27-2011, 05:14 AM
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#5
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Senior Member
Join Date: Nov 2010
Location: New England
Posts: 23,946
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Harry is drunk.
Depending on which year NEC you are on (and your main service conductor size) #1 AL or 1/0 AL.
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02-27-2011, 02:10 PM
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#6
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NRA Member
Join Date: Feb 2011
Location: Wonderful Northern Minnesota
Posts: 4,279
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[quote=yetti;392197]What size aluminum SER cable do you need to feed an 100 amp sub panel in a residence?[/quote
Table 310.15(B)(7) for full unit(as an apartment)
Last edited by backstay; 02-27-2011 at 02:14 PM.
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02-27-2011, 02:14 PM
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#7
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Senior Member
Join Date: Nov 2010
Location: New England
Posts: 23,946
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Quote:
Originally Posted by backstay
Table 310.15(B)(7)
#2 AL
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In most cases you cannot use Table 310.15(B)(7) to supply a sub panel, you would have to use Table 310.16.
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02-27-2011, 02:18 PM
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#8
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NRA Member
Join Date: Feb 2011
Location: Wonderful Northern Minnesota
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So the question is, what is the sub panel feeding, an apartment or a guest house or a panel to add spaces for expansion?
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02-27-2011, 02:21 PM
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#9
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NRA Member
Join Date: Feb 2011
Location: Wonderful Northern Minnesota
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Quote:
Originally Posted by BBQ
In most cases you cannot use Table 310.15(B)(7) to supply a sub panel, you would have to use Table 310.16.
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The 2011 book has no 310.16 anymore, table is 310.15 now. Our continuning ed classes are on the 2011 NEC now.
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02-27-2011, 02:28 PM
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#10
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Registered Member
Join Date: Jan 2011
Location: missouri
Posts: 7,306
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Quote:
Originally Posted by backstay
So the question is, what is the sub panel feeding, an apartment or a guest house or a panel to add spaces for expansion?
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Read 310.15 (B)(6) in the 08 code they clarified that the use of table 310.15(B)(6) only applies to conductors carrying100% of the dwellings deversified load.
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02-27-2011, 02:30 PM
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#11
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Senior Member
Join Date: Nov 2010
Location: New England
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Quote:
Originally Posted by backstay
The 2011 book has no 310.16 anymore, table is 310.15 now. Our continuning ed classes are on the 2011 NEC now.
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Thanks, I have the 2011 beside me but did not notice 310.16 was now .15
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02-27-2011, 03:00 PM
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#12
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Senior Member
Join Date: Jul 2010
Location: IL
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Quote:
Originally Posted by BBQ
Thanks, I have the 2011 beside me but did not notice 310.16 was now .15
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Not exactly, what was T310.16 is now 310.15(B)(16). All of the ampacity tables are 310.15(B)(xx), with the xx being the .(xx) in the 2008 code.
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02-27-2011, 03:26 PM
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#13
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Member
Join Date: Aug 2008
Location: murfeesboro tn
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And ya'll wonder why some people (like me) can't recite codes  !
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02-27-2011, 03:30 PM
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#14
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Fried Bologna um um good!
Join Date: Jan 2010
Location: nc
Posts: 8,092
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He asked what size SER he would need to run for a sub panel. BBQ had it correct. 1/0 is good for 100A at 60 degrees.
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02-27-2011, 05:41 PM
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#15
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Moderator
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Location: NY State
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Quote:
Originally Posted by jwjrw
1/0 is good for 100A at 60 degrees.
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I'm sorry, while I realize this is the true code today, for YEARS we ran #2AL SER to a sub-panel. It is (still) good enough for a main feeder, yet it is more than two sizes to small today for a sub-panel. Pathetic.
Anyone EVER hear of ANY issues with running #2AL SER to a 100A sub-panel???? Grrrr. 
Oh well, live by the code, I know. 
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02-27-2011, 06:04 PM
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#16
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Heavily Armed Member
Join Date: Sep 2010
Location: Fascistchusetts
Posts: 29,505
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Quote:
Originally Posted by BBQ
Harry is drunk.
Depending on which year NEC you are on (and your main service conductor size) #1 AL or 1/0 AL. |
Mabe i was..
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02-27-2011, 11:45 PM
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#17
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Junior Member
Join Date: Feb 2011
Location: colorado
Posts: 4
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Thanks for all the input, I am going off of 2008 code, and the sub-panel does supply 100% of the dwelling units load, so it is considered the main feeder. So according to 310.15(B)(6) I am allowed to use a #2 XHHW SER CABLE to feed the panel with 100 amps.
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02-28-2011, 02:43 AM
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#18
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Heavily Armed Member
Join Date: Sep 2010
Location: Fascistchusetts
Posts: 29,505
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Quote:
Originally Posted by yetti
Thanks for all the input, I am going off of 2008 code, and the sub-panel does supply 100% of the dwelling units load, so it is considered the main feeder. So according to 310.15(B)(6) I am allowed to use a #2 XHHW SER CABLE to feed the panel with 100 amps.
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Yes that is right if you are going by the 2011 NEC it would be table 310.15(B)(7) That is the only differnce..
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