DC Load Center's [RE-wrenches]

[Travis Creswell, Ozark Solar]

They are rating them at 14k AIC at 125 vdc.  I was planning on using current
limiting fuses on each string.  Inspection is not an issue.

Can your product handle all I need it to plus leave room for expansion?

Travis
OES
----------
>From: Christopher Freitas  -  OutBack Power <cfreitas at outbackpower.com>
>To: RE-wrenches at topica.com
>Subject: RE: DC Load Center's [RE-wrenches]
>Date: Wed, May 1, 2002, 12:23 PM
>

>> Has anyone every used the Cutler-Hammer Products rated for 125/250
>> VDC? Specifically PRL3a with GHB breakers.  Supposedly, it will
>> allow for a main breaker of up to 800 amps and branch circuit 
>> breakers of up to 400 amps.  All rated at 125/250 VDC.  By the way, > 
>> just what do they mean by that? According to my local Cutler Hammer > 
>> Supplier they supply CH products to a local company who makes and 
>> installs Telecomm power houses and they are using them in DC 
>> applications. 
>
>Be careful with DC ratings on AC breakers - They may be approved for 
>very specific applications and installation methods.  For example, the 
>interruption capacity (called AIC) may not be enough for use with 
>batteries or may require "back-up" fusing to be used safely with 
>batteries.  In Telecom applications it is very common for a current 
>limiting fuse to be installed on each string of batteries before leaving 
>the battery enclosure ahead of any breakers to limit the fault current.  
>This may or may not be allowed on NEC inspected systems.  
>
>I wrote an article on DC breakers vs. fuses in 1992 in Home Power which 
>is dated but still is useful - here is the link:
>
>www.humboldt1.com/~michael.welch/hp27-26.pdf 
>
>The article includes some real hands on testing of DC rated breakers in 
>which we blew them apart and caused excessive arcing and damage.  
>
>Christopher Freitas
>OutBack Power Systems, Inc.
>cfreitas at outbackpower.com  www.outbackpower.com
>Tel 360 435 6030  Arlington WA USA
>
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