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-   -   Two Panels - Two Main Breakers? (https://www.nachi.org/forum/f19/panels-main-breakers-94154/)

mkoester 9/8/14 7:08 PM

Two Panels - Two Main Breakers?
 
1 Attachment(s)
I saw a detatched house with two main Service Panels side by side today - neither was a sub. Both fed off the meter. Is this common? Anything I need to be aware of when inspecting these or is it just two panels?

mkoester 9/8/14 7:09 PM

Re: Two Panels - Two Main Breakers?
 
Sorry for the crappy pictures. I'll have a decent camera soon.

Robert Meier 9/8/14 7:14 PM

Re: Two Panels - Two Main Breakers?
 
Common for larger homes require more than a 200 amp service.

mkoester 9/8/14 7:17 PM

Re: Two Panels - Two Main Breakers?
 
So do they usually just "double tap" off the meter as this case appeared to be? It was underground service and the meter was on the other side of the wall of where they were mounted. I know this is not a double tap that gets written up - just asking.

Robert Meier 9/8/14 7:21 PM

Re: Two Panels - Two Main Breakers?
 
Typically you will have a double lugs at the meter listed for two conductors so it's not really a "double tap".

mkoester 9/8/14 7:25 PM

Re: Two Panels - Two Main Breakers?
 
Okay, thanks Robert.

mclark2 9/8/14 8:23 PM

Re: Two Panels - Two Main Breakers?
 
Like Robert said, it's not double tapped-it's double lugged at the meter base.

Be sure and check the meter to verify the service.

(2) 200 amp panels don't always mean 400 amp service.

mkoester 9/8/14 8:44 PM

Re: Two Panels - Two Main Breakers?
 
How would two 200A panels not equal 400A? Can the amperage coming in through the service entrance cables be less than 400A?

ccurrins 9/8/14 9:03 PM

Re: Two Panels - Two Main Breakers?
 
If there is no disconnect at meter or before the panels, what you have is two 200 amp service panels.

btoye 9/8/14 9:08 PM

Re: Two Panels - Two Main Breakers?
 
Quote:

Originally Posted by ccurrins (Post 1226770)
If there is no disconnect at meter or before the panels, what you have is two 200 amp service panels.

Wouldn't that be a 400A service?

kramm 9/8/14 9:38 PM

Re: Two Panels - Two Main Breakers?
 
Yes its a 400amp service coming in to a 320 meter base or should be.

lkage 9/8/14 9:47 PM

Re: Two Panels - Two Main Breakers?
 
Quote:

Originally Posted by ccurrins (Post 1226770)
If there is no disconnect at meter or before the panels, what you have is two 200 amp service panels.

I agree.

Quote:

Originally Posted by btoye (Post 1226775)
Wouldn't that be a 400A service?

SEC could be sized differently.

mclark2 9/8/14 10:01 PM

Re: Two Panels - Two Main Breakers?
 
Quote:

Originally Posted by btoye (Post 1226775)
Wouldn't that be a 400A service?

It depends on the meter rating. It's probably 320 like Kenneth said.

mkoester 9/9/14 6:21 AM

Re: Two Panels - Two Main Breakers?
 
This base states 320A continuous & 400A maximum (burst).

http://www.homedepot.com/p/Milbank-3...-5T9/202504264

kramm 9/9/14 8:11 AM

Re: Two Panels - Two Main Breakers?
 
Quote:

Originally Posted by mkoester (Post 1226874)
This base states 320A continuous & 400A maximum (burst).
http://www.homedepot.com/p/Milbank-3...-5T9/202504264

This is what should be there as per your question, 400amp noncontinuous 320amp continuous.
So for a 200amp service the meter base is 200amp noncontinuous 160amp continuous
This is how meters are rated.
So per your question 2-200amp panels do not make 400 amps, it's the service coming in that should be 400 amps as Larry mentioned and then split off with 4/0 aluminum or 2/0 copper to the panels from the meter base, then you have your 2/200amp panels with main breakers.


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