600 VDC switches [RE-wrenches]

[David Henry]

<x-flowed>
Brad et al,

What about using the HU361 for both strings of a Sunny Boy 2500 with 
about 4.5 amps/string and a typical Vmp=300 & Voc=475. This is much 
less than the amperage rating of the switch.  Also seems to be SOP of 
most the "wrenches" in these parts. What does Mr. Berdner and the SMA 
crew recommend?

David Henry
Harmony Farm Supply
3244 Hwy 116 N.
Sebastopol, Ca 95472
voice 707-823-9125 X14
fax 707-823-1734
david at harmonyfarm.com
www.harmonyfarm.com



>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
>
>- - - -
>To send a message: RE-wrenches at topica.com
>
>Archive of previous messages: http://www.topica.com/lists/RE-wrenches/
>
>List rules & etiquette: http://www.mrsharkey.com/wrenches/etiquete.htm
>
>Check out participant bios: www.mrsharkey.com/wrenches/index.html
>
>Hosted by Home Power magazine
>
>Moderator: michael.welch at homepower.com
>


-- 

- - - -
To send a message: RE-wrenches at topica.com

Archive of previous messages: http://www.topica.com/lists/RE-wrenches/

List rules & etiquette: http://www.mrsharkey.com/wrenches/etiquete.htm

Check out participant bios: www.mrsharkey.com/wrenches/index.html

Hosted by Home Power magazine

Moderator: michael.welch at homepower.com

==^================================================================
This email was sent to: michael.welch at homepower.com

EASY UNSUBSCRIBE click here: http://topica.com/u/?bz8Qcs.bz9JC9
Or send an email to: RE-wrenches-unsubscribe at topica.com

T O P I C A -- Register now to manage your mail!
http://www.topica.com/partner/tag02/register
==^================================================================



</x-flowed>