Almost right Christopher. NEC 705.12(2) allows the ratings of the
overcurrent devices supplying power to the bus bar to be 120% of the
busbar rating. For a 225-amp busbar that amounts to 270 amps. So a
200-amp main breaker and a 70-amp back fed breaker from the solar
system. Or a 225-amp main breaker and a 45-amp back fed breaker from
the solar system.
Christopher Freitas wrote:
Ahhh – I think I get it – you get the 20% of the 200 amps (so 40 amps) +
the extra 25 amps because the buss is only running at 200 amps?
I just saw you emailed me…
Christopher
Christopher Freitas
Director of Research and Development
OutBack Power Systems, Inc.
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
Tel 360 435 6030
Cell 360 202 4239
19009 62^nd Ave NE
Arlington WA 98223 USA
www.outbackpower.com <http://www.outbackpower.com/>
------------------------------------------------------------------------
*From:* [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] *On Behalf Of *David
Brearley
*Sent:* Thursday, December 04, 2008 11:41 AM
*To:* RE-wrenches
*Subject:* Re: [RE-wrenches] Square D 225A load center
It has an option for a factory-installed 200A main breaker.
On 12/4/08 12:31 PM, "Christopher Freitas" <[EMAIL PROTECTED]>
wrote:
How does the 225 amp rating make it ideal for 60 amp breakers? 20% of
225 amps is 45 amps – and even with “rounding up” it only gets you to 50
amps.
Christopher
Christopher Freitas
Director of Research and Development
OutBack Power Systems, Inc.
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
Tel 360 435 6030
Cell 360 202 4239
19009 62nd Ave NE
Arlington WA 98223 USA
www.outbackpower.com <http://www.outbackpower.com/>
------------------------------------------------------------------------
*From:* [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]> *On Behalf Of
*Andrew Truitt
*Sent:* Thursday, December 04, 2008 8:33 AM
*To:* RE-wrenches
*Subject:* [RE-wrenches] Square D 225A load center
Greetings all! I heard that Square D makes a load center with a 225A
buss bar and a 200A main breaker - ideal for installing 60A of solar
interconnection breakers. Does anyone have a part number (or any other
info) on this item?
Thanks!
Andrew Truitt
Standard Solar
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