Sq D as combiner box [RE-wrenches]

[Phil Undercuffler]

The Heineman and AirPax breakers have sufficient AIC to be used on DC
systems by themselves, but they cannot provide AIC necessary for downstream
QO breakers.  As John Wiles sez, you can't use a breaker to protect a
breaker.

Phil Undercuffler
Positive Energy


----- Original Message -----
From: David Palumbo, Independent Power & Light <ipl at sover.net>
To: <RE-wrenches at topica.com>
Sent: Wednesday, April 04, 2001 12:24 PM
Subject: RE: Sq D as combiner box [RE-wrenches]


>
>
>
>
> >the Heineman breaker will not provide the AIC that
> >the QO needs--you must use a current limiting fuse.
>
> <True. There are no current limiting breakers, so a fuse is the only
> option.>
>
>
> Eric,
>
> What about the hundreds of systems out there using Trace DC250 disconnects
> (Heinemann breakers) with no current limiting fuse.
> I always used to use Class RK5, or Class T fuses until Trace came out with
> their disconnect box using the dc rated Heinemann breaker. They said that
> these breakers met code and that we no longer needed current limiting
fuses.


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