600 VDC switches [RE-wrenches]

Max Balchowsky max at seesolar.com
Fri Oct 11 10:08:27 PDT 2002


Jeff, thats the way we always wire them, but I don't know if that increases
the rating...........

Max

----- Original Message -----
From: "Jeff Clearwater, Ecovillage Design" <clrwater at earthlink.net>
To: <RE-wrenches at topica.com>
Sent: Thursday, October 10, 2002 9:17 PM
Subject: RE: 600 VDC switches [RE-wrenches]


> Hey Brad and all,
>
> On the recent Sunny Boy install I used all three poles of the HU361
> to switch the positive.  In one lug, then two jumpers, out the last
> lug.  Seems like if they are there, why not use them.  Then the arc
> is broken three times.  Strikes me that they may be rated even higher
> with this scheme.  What ya think?
>
> Jeff
>
>
>
> >EH,
> >
> >I don't know who you talked with at Sq D but I'm pretty certain that
> >switch is NOT rated for 600 VDC through one pole! Michael D. contacted
> >engineers at both Sq D and GE about 600VDC switches and got the same
> >answer from both. One pole might break the 600VDC under some conditions,
> >but two poles are necessary for consistant performance with the amperage
> >rating of the switch.
> >
> >The Sq D guy was right that you do not have to wire the OUTSIDE poles,
> >just two poles, and they can be adjacent poles, indeed this is how GE
> >wires them at the factory. Maybe this confused the guy at Sq D, and when
> >he gets back to you about the number of positives, he will have got to
> >the root of this and found out that it is only one. This leaves one pole
> >of the three unused, but we haven't figured out what to do with it
> >except let it sit there.
> >
> >I think that this list is a good forum for spreading info like this, and
> >hope this will keep anyone else from the mistake of mis-wiring these
> >switches, and it's attendant hazard.
> >
> >Brad
> >
> >
> >EH Roy wrote:
> >>  Brad,
> >>
> >>  I remember that arcing problem, but don't remember the brand of
> >>  disconnect
> >>  it occurred in.
> >>
> >>  Square D technical support tells me I don't have to wire two outside
> >>  poles
> >>  in series to get a 600VDC rating on their HU361 - switching of one
> >>  positive
> >>  through one pole is appropriate and covered by the UL listing. They
are
> >>  still scratching their heads about how many positives can be switched
in
> >>  one
> >>  disconnect.
> >>
> >
> >>
> >>
> >>
> >
> >
> >
> >Brad Bassett
> >Schott Applied Power
> >Tumwater, WA office
> >bsbassett at earthlink.net
> >
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>
> --
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Jeff Clearwater
> Ecovillage Design Associates - Whole Systems Design
> Community and Village Scale Renewable Energy & Water Systems
>
> Cell: 720-480-8455
> Office:  800-440-2523 (PIN-7071)
> Fax:  720-528-7813
> jeffc at ic.org
>
> Council Member - Ecovillage Network of the Americas -
http://www.ecovillage.org
> Advisory Board - Living Routes - Ecovillage Education -
> http://www.livingroutes.org
> Founder:  Ecovillage Research, Development, and Demonstration Program:
> http://www.home.earthlink.net/~clrwater/RDD/rdd.html
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
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>
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>
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