Sq D as combiner box [RE-wrenches]

[Bill Brooks]

Wrenches,

There was a fairly thorough discussion of this topic a month ago. Jack West
and others confirmed that the Heinemann breakers have a 25,000 AIR at 60
Volts--our battery bus voltage. I believe that satisfied the requirement for
current limitation.

However, as we discussed last month, I do not believe that a QO load center
is appropriate for use as a combiner box to meet the NEC. The snap-in
variety do not meet the requirement to have a fastener on all back-fed
breakers. Some inspectors allow the cover to satisfy the fastener
requirement, but not all.

Bill.


> -----Original Message-----
> From: David Palumbo, Independent Power & Light [mailto:ipl at sover.net]
> Sent: Wednesday, April 04, 2001 10:24 AM
> To: RE-wrenches at topica.com
> 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.
>
> Dave Palumbo
>
>
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>

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