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#27732 - 07/31/03 05:12 PM 200 amp panel upgrade
aldav53 Offline
Member

Registered: 08/22/01
Posts: 547
Loc: Chandler, AZ USA
I am changing out a 3 phase 100 amp panel fed with #2 aluminum. It has 30 circuits and the only way to change it is to upgrade it to a 200 amp to cover the circuits since they don't make a 100 amp with that many circiuts in it anymore. They do make a 125 amp with 12 circuits or 150 amp with 24 circuits which I would have to use twins on.
The problem is, can I upgrade to a 200 amp panel with only #2 aluminum feeders?
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#27733 - 07/31/03 05:18 PM Re: 200 amp panel upgrade
Ron Offline
Member

Registered: 03/13/02
Posts: 577
Loc: White Plains, NY
Use a 200A panel with a 100A main circuit breaker.
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#27734 - 07/31/03 05:19 PM Re: 200 amp panel upgrade
Tom Offline
Member

Registered: 01/01/01
Posts: 1069
Loc: Shinnston, WV USA
As far as I know, you can do this. However, check the lugs on the new 200 amp panel to make sure that the wire that you connect to them is in the listed range of acceptable wire sizes.

Also, if that #2 aluminum wire is being protected by a 100 amp breaker, change that breaker to 90 amps.
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#27735 - 07/31/03 07:58 PM Re: 200 amp panel upgrade
Electric Eagle Offline
Member

Registered: 04/20/02
Posts: 928
Loc: Alpharetta, GA
Tom, why do you say to change the breaker to 90? Since this is a service or feeder, not a branch circuit, the code allows #2AL for 100 amps.

[This message has been edited by Electric Eagle (edited 07-31-2003).]

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#27736 - 07/31/03 08:29 PM Re: 200 amp panel upgrade
caselec Offline
Member

Registered: 04/14/02
Posts: 557
Loc: San Jose, CA
Table 310.15(B)(6) only applies to 120/240 volt 3-wire single-phase dwelling services and feeders.

If the terminations on both ends of this #2 AL are rated for 75C the 75C column can be used which shows that ampacity as 90 amps. If the terminations on either end are only rated for 60C conductors then the 60C column must be used which shows the ampacity as 75 amps.

[This message has been edited by caselec (edited 07-31-2003).]
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#27737 - 08/01/03 02:55 PM Re: 200 amp panel upgrade
Electricmanscott Offline
Member

Registered: 01/12/02
Posts: 1478
Loc: Holden, MA USA
nevermind

[This message has been edited by Electricmanscott (edited 08-01-2003).]

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#27738 - 08/01/03 10:54 PM Re: 200 amp panel upgrade
aldav53 Offline
Member

Registered: 08/22/01
Posts: 547
Loc: Chandler, AZ USA
Electricmanscott, what does that mean?
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#27739 - 08/02/03 04:45 AM Re: 200 amp panel upgrade
Electricmanscott Offline
Member

Registered: 01/12/02
Posts: 1478
Loc: Holden, MA USA
I wrote something, then I read the question again. I gave the wrong info. Missed the three phase part. Anyway I would go with the 200 amp panel and back feed a breaker if the lugs can't be used. I think you will have to go with the 90 amp breaker anyway. I assume that this will be enough for the loads to be served?

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#27740 - 08/02/03 09:38 AM Re: 200 amp panel upgrade
aldav53 Offline
Member

Registered: 08/22/01
Posts: 547
Loc: Chandler, AZ USA
Ya, may have to do that. I put an amp clamp on one leg and it was drawing 80 amps, panel is maxed out. Maybe I can use a 200 amp panel without the 90 or 100 amp main since it is fused at the main disconnect.
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