48V hardware [RE-wrenches]

[Travis Creswell, Ozark Solar]

Hey William,

I sort of got lost on that QO thread.  That's pretty bad as I'm the one who
started it.  Thanks again to everyone who contributed!  Especially you
William.  You did a bunch of homework on that deal.

 The point where I got confused and my attention span was outlived was where
QO's were good up to 125 vdc if there wasn't grounded conductor.  Was
something like that stated?  Is that right.

Travis

----- Original Message -----
From: "William Miller" <wrmiller at slonet.org>
To: <RE-wrenches at topica.com>
Sent: Saturday, July 14, 2001 9:57 AM
Subject: Re: 48V hardware [RE-wrenches]


> At 02:39 PM 7/13/01 -0600, you wrote:
> >>>>
>
>   Wrenches,
>   1. What has proven to be the best approach you have found for small load
centers or disconnects for 48VDC nominal systems? For example, I need two
single pole low-amperage disconnects for a 48VDC (nominal) subpanel, for two
pump loads in a 6' by 6' well pit (so needs raintight, I believe). If I use
1P breakers I can disconnect each load independently, which is desireable;
but a 2P fused or unfused disconnect may be cheaper and simpler to obtain.
Best proven methods, please?
>   I have saved and reread earlier postings on QO breeaker DC ratings.
Nothing seems appropriate here except Square D FHL16015 breakers in a
FA100RB enclosure. But my supply house quote for two breakers in one box is
$480. Ouch.
>   Has anyone successfully adapted Heinemann CF/Philips Airpax/Carling
125VDC breakers to a standard NEMA 3R enclosure for use as a DC load center?
>
>
> Allan:
>
> Why don't you think the Square D QO is suitable? My conclusion is that
Square D is suitable up to 125 volts DC unless connected directly to a
battery bank, as it lacks only the AIC rating. I use QO with confidence as
long as it is isolated from the batteries by a fuse or a Heinman breaker.
>
> William Miller
>
>


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