dc rated switches [RE-wrenches]

[Bob-O Schultze, Electron Connection]

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Hiya Eric,
Not familiar with that Siemens Safety Switch, but in many others 
(Square D, Cutler&Hammer come to mind) a Heavy Duty switch usually has 
a 250VDC or better rating on the name plate. The switch could be-and 
probably is- perfectly fine but Siemens didn't want to pay the hefty UL 
vigorish to get it DC rated as well as the ac rating.
Bob-O
On May 11, 2005, at 12:48 PM, Eric Smiley wrote:
> I recently visited a grid-tie PV system where a siemens Heavy Duty 
> Switch
> (Type VBII) was used for the array disconnect. In a negative grounded
> system do these switches need to have the positive conductor pass 
> through
> two (or more) poles of the switch in DC applications? I can't find
> anything on the Seimens site to indicate yea or nay.
>
>
> Eric Smiley,  MASc
> Project Leader - Technology Centre
> British Columbia Institute of Technology
>
> NE25 - 3700 Willingdon Avenue
> Burnaby, British Columbia
> Canada V5G 3H2
>
> phone: 604.432.8657    fax: 604.436.0286
> esmiley at bcit.ca

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