[RE-wrenches] Square D DC disconnects

[David Brearley]

(Unless, of course, you are working with a transformerless inverter and an
ungrounded array, in which case both the positive and negative conductors
would need to be switched, since both are ungrounded.)


On 1/10/10 9:10 AM, "Drake Chamberlin"
<drake.chamberlin at redwoodalliance.org> wrote:

> At 05:14 PM 1/9/2010, you wrote:
>> I recently came across a revised technical bulletin from square D (
>> http://ecatalog.squared.com/pubs/Electrical%20Distribution/Safety%20Switches/
>> Heavy%20Duty/3110DB0401.pdf )......
> We would need to use method "D" with the three pole. Method "C" would break
> the negative, leaving it ungrounded.
> 
> 
> Drake Chamberlin
> Athens Electric
> OH License 44810
> CO License 3773
> NABCEP TM Certified PV Installer
> Office - 740-448-7328
Mobile - 740-856-9648 
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