Switching Array leads[RE-wrenches]

[Drake Chamberlin]

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The ungrounded conductors must be switched.  In some systems ( I 
think under 50 volts) it is still permissible to not have a grounded 
circuit conductor, but to switch both.   I believe it is code to 
break the grounded conductor with a switch, so long as the ungrounded 
conductor breaks at the same time.

Drake


At 06:39 AM 7/28/2007, you wrote:

>As I recall, the older code required both the positive and negative 
>leads of an array to be switched at the array dis-connect. I think 
>at the time there was no DC ground fault required and most of these 
>were low voltage arrays. More recently, I believe the code indicates 
>only the "un-grounded" lead to be switched, which would imply just 
>the positive lead. Since we now have ground fault circuits I think 
>this may also be related to the ground fault working properly since 
>it needs to "see" the potential between the grounding conductor and 
>the negative before it is grounded.
>
>However, in the recent issue of HomePower there is a system showing 
>both the positive and negative leads being switched at the array 
>dis-connect. Am I wrong and this is not code, ground fault, or high 
>voltage related issue and it is up to the installer? Since all 
>dis-connects are either 2 or 3 pole, it is not a cost issue, so 
>under what (if any) circumstances would you switch only the positive 
>and allow the negative and array frame grounding conductor to pass 
>through the dis-connect.
>
>Thanks,
>
>Jeff Yago
>
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