600 VDC switches [RE-wrenches]

[David Henry]

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Eric et al,

I just downloaded Square D doc#17103006.pdf which I would be happy to 
email to anyone off-list. This is page 3-6 from their catalogue. 
Title is "Heavy Duty Saftey Switches, Not Fusible 600 Volt, Class 
3110"  and for the HU 300 & HU 400 series the note referencing DC 
operation states "For 3 and 4-pole devices use outside two poles for 
switching DC". I read this as stating we can switch two positives on 
the outside poles and run the negatives, unswitched, directly to the 
Sunny Boy inverter. Could a code guru straighten this out for us? 
Please quote chapter and verse so I can check your sources.

Thanks

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

>  >research on Square D breakers.  They are UL rated for
>>45 VDC and factory certified for 125VDC.
>
>There is a Square D Bulletin No. D-453A on "DC Rated Circuit Breakers"
>that can be downloaded from the Square D website as a pdf. The file  is
>in the On-Line Digest Technical Library under circuit breakers-general
>information.
>
>http://www.squared.com/us/internet/oldigest.nsf
>
>It has all the DC ratings for Square D breakers as well as the wiring
>diagrams that go with those ratings.
>
>For example, The factory certified 125 VDC rating on QO breakers
>requires both the positive and negative to be switched through a 2 pole
>breaker. Whereas the UL/CSA 48 VDC rating only requires one pole.
>
>Some of the breakers like the FA breakers only achieve the factory
>certified 600 VDC rating if you run your positive through all three
>poles of a 3 pole breaker. None of their breakers show a 600 VDC UL/CSA
>recognition or listing.
>
>Eric Smiley
>Project Leader
>Photovoltaic Energy Applied Research, Technology Centre
>British Columbia Institute of Technology
>Burnaby Campus
>
>NE25 - 3700 Willingdon Avenue
>Burnaby, British Columbia
>Canada V5G 3H2
>
>phone: 604.432.8657    fax: 604.436.0286
>esmiley at bcit.ca             www.tc.bcit.ca
>
>The information contained in this E-mail is intended for the addressee
>only.  If you have received this in error please delete it.
>
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