HU361 as Combiner/Disconnect [RE-wrenches]
John Berdner
jberdner at sma-america.com
Tue Jun 3 14:03:51 PDT 2003
Wrenches:
Square D told me that the lugs ARE approved for 2 wires per lug but in
some weird combinations.
1 AWG #10 solid and 1 AWG #12 stranded, etc.
I explained the intended use and suggested they change it to all
combinations of 1 each AWG #10 to AWG #14 stranded or solid.
They said they would do this (it is a simple mechanical pull test) but
I have not seen anything further on it.
I'll follow up withthem and see whas up.
Regards,
JSB
>>> clrwater at earthlink.net 6/3/2003 11:45:10 AM >>>
Hi Matt,
Yes I see your points. I was trying to get away with only one line
to the SB by combining a the HU361 but if each lug is rated for only
one cu landing that won't work and it defeats what I was after.
But it strikes me as very odd that a PSSB breaker can be rated to two
conductors/lug but not the nice big lugs on a HU361. Any chance of
that rating changing? John B?
Thanks,
Jeff C.
>
>1. The Line (Array) is required to be landed on the top lugs of the
>Disco. (Behind the arc-shield)
My drawing was electrical not orientation - but yes thanks for the
reminder of using the shieded side correctly.
>
>2. The lugs are rated for single-conductor landing only.
>
>My recommendation, at least relating to the Disco at the Inverter, is
to
>run the two "switched hots" (from the bottom lugs) to the SB. The SB
>has 3 DC Input terminals for a reason. This is it.
>
>Regarding the use of an HU361 at dual locations, I think you will
find
>you can easily run the extra pair between disconnects in the same
>conduit you are already installing.
>
>Try it this way:
>
>ARRAY
>
>+ from String 1
> + from String 2
>l l
>0 0 0
>
> ROOF Disco
>
>0 0 0
>l l
>l l
>l l
>+ + to 2nd Disco; Line 3
>to 2nd Disco; Line 1
>l l
>l l ________ IN CONDUIT
>l l
>
>
>+ from Roof Disco; Load 1
> + from Roof Disco; Load 3
>l l
>0 0 0
>
> INVERTER DISCO
>
>0 0 0
>l l
>l l
>l l
>+ + to SB DC Input
>to SB DC Input
>
>
>Hope this helps...
>
>Pray for Sun and No Tanlines!
>
>Matt Lafferty
>Universal Energies Institute
>mlafferty at universalenergies.com
>(916) 422-9772
>(916) 628-7694 Cell
>(916) 914-2247 Fax
>www.universalenergies.com
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