Sq D as combiner box [RE-wrenches]

[sunwise at cheqnet.net]

sunwise at cheqnet.net wrote:

A SD fuse will limit the DC current flow to/from a given device if the
amperage begins to exceed the circuits design limits,

Hey again,

Talk about mixing up terms, I want to say "A SD BREAKER"
Sorry  -- Kurt Nelson

 
> 
> Someone's snip....
> "the Heineman breaker will not provide the AIC that
> the QO needs--you must use a current limiting fuse"
> 
> Eric Smiley wrote:>
> > True. There are no current limiting breakers, so a fuse is the only
> > option.
> 
> Greetings,
> 
> I've been following this discussion and I must say that I have
> apparently not understood the issue to date.  Or, could it be that there
> is just some confusion regarding terminology -- Current Limiting vs.
> Current Interrupting.
> 
> I thought all breakers were current limiting, that is their job, to
> limit the current flow on, for instance, a branch circuit.  They
> typically do not have the current interrupting ratings that fuses in the
> R and T class have.  A SD fuse will limit the DC current flow to/from a
> given device if the amperage begins to exceed the circuits design
> limits, like if someone plugged too many appliances ito a circuit with a
> conductor protected by a breaker.
> 
> They perfom poorly at current interruption, like in a battery based
> system when someone sticks a screw driver into a DC branch circuit
> outlet box and welds then thing in there good.  In such a situation, the
> breaker would try to limit the current, but the DC rated/high current
> interrupting T class fuse that is protecting the breakers would save the
> day.
> 
> Could I be way off base here??? -- Kurt Nelson
> 
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