Parallel String Brain Teaser [RE-wrenches]

[Bob-O Schultze, Electron Connection]

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Bill,
I should have clarified this further. I have no problem with series 
string fuses at Isc x 1.56. They will disconnect a shorted string 
from the rest of the pack. The main array disconnect(on the PV side 
of the CC), however, if sized at Short circuit x 1.56, becomes a 
switch and nothing more.
Bob-O

>Bob-O,
>
>I'm trying to understand your comment. What prevents backfeed to the array
>in the event of a fault with a CC that does not prevent backfeed or that has
>failed?
>
>What about parallel strings feeding a fault? That is something the CC has no
>control over.
>
>In these cases the fuse does much more than provide a disconnect in my
>experience.
>
>Bill.
>
>
>-----Original Message-----
>From: Bob-O Schultze, Electron Connection
>[mailto:econnect at snowcrest.net]
>Sent: Monday, May 20, 2002 11:12 AM
>To: RE-wrenches at topica.com
>Subject: RE: Parallel String Brain Teaser [RE-wrenches]
>
>
>Bill and All,
>In my experience, sizing an overcurrent device at Isc X 1.56 per NEC
>on the PV side of the CC pretty much turns whatever you are using
>into a disconnect and nothing more.
>Bob-O
>

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