Combiner box alternate solutions [RE-wrenches]

[Phil Undercuffler]

The applications engineer that I talked to at Cooper Bussmann stated that
there is no UL Listed 1/4" fuse, only UL Recognized--a subtle but critical
difference.

Incidentally, for array combiners I see no reason the fuse must be touch
safe, it only must be able to be disconnected from All sources of power
before service.  Technically, the code allows covering the panels to serve
as depowering the array, and throwing the charge controller breaker
disconnects any potential from the opposite direction.  I explored the
touchsafe avenue just searching for a low cost DC current-limiting
disconnect that might be finagled into better safety on smaller or retrofit
situations.

Phil Undercuffler
Positive Energy

----- Original Message -----
From: Bill Brooks <billbrooks7 at earthlink.net>
To: <RE-wrenches at topica.com>
Sent: Tuesday, March 27, 2001 9:47 PM
Subject: RE: Combiner box alternate solutions [RE-wrenches]


> Phil,
>
> I think your information about ABC fuses not being DC-rated is wrong. In
> fact, I know that they are 125 Vdc rated and carry a 3,000 AIR for DC. You
> have to get the cut sheet information to find this. It is not printed on
the
> fuse. It may not be UL-List and that is okay as long as it is
UL-recognized
> and being used in a UL-listed assembly (TCB-10, Sun-Tie, GC-1000). It
means
> that we cannot build our own assembly, that's all.
>
> Any fusing system we install must have a touch-safe assembly so we cannot
> inadvertently access the live parts. This usually means so type of snap-in
> assembly that pulls the fuse out for us and allows us to withdraw the fuse
> in a dead condition.
>
> Bill.


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