PV Negative color [RE-wrenches]

[Ray Walters]

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Interesting Discussion. I've always had issues with this especially  
low voltage DC using NMB (w/ black, white, & ground) ,then the Poor  
Homeowner knows his low voltage from the auto industry: black is  
negative, red positive. He looks at black and white and figures "hey  
at least one color I know" and hooks the black to neg........ Funny  
too because most inverter manus agree with the auto industry on the  
colors of their main DC lugs: Red & Black.
I think we have a unique situation here and that applying the same  
color coding from AC wiring is problematic.
We try to always use red for positive, and then  I sometimes prefer  
white striped tape on black instead of straight white. Code allows us  
to tape PV wires smaller than #4. Coded gets its white, homeowner  
sees black and red and gets polarity right.
How bout a Special wire just for us: black with a spiral white stripe  
on it that not only indicates negative, grounded conductor, but also  
indicates DC wiring. There really should be a way to tell just by  
looking that the wiring is DC, especially with load centers that  
house both AC & DC.

Ray


On Dec 6, 2007, at 2:14 PM, Ron Schroeder wrote:

>
> And since it is normally groundED, it must still be white.
>
> Ron Schroeder
> WD8CDH
> NABCEP Certified Solar PV Installer TM
>
> ----- Original Message ----- From: <erika at repowersolutions.com>
> To: <RE-wrenches at topica.com>
> Sent: Thursday, December 06, 2007 3:28 PM
> Subject: RE: [SPAM] PV Negative color [RE-wrenches]
>
>
>>
>> Your concern is addressed by labeling per 690.5(C) not by color.
>> If if you have some GFP, the label should say something like:
>> ground fault is indicated when xxx, grounded conductors may be  
>> energized.
>>
>> erika
>
>
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R. Walters
Solarray.com
NABCEP # 04170442	




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