[RE-wrenches] Two NEC questions

[Ray Walters]

Midnite Solar has some DC arc fault equipment both built into their 
charge controllers (for battery based systems) and their Combiner 
boxes.  The nice thing about having AFCI at the combiner is that it 
actually protects the wiring from the array to the inverter, so if an 
arc is occurring in say the attic, it will interrupt the electricity at 
its source, not at the load.

Ray Walters


On 10/13/2012 9:12 AM, Rebecca Lundberg wrote:
> Dear fellow wrenches,
>
> Does anyone have suggestions for the 'best' way to keep up with 
> product availability for meeting 690.11 on DC AFCI? I understand that 
> when this code section was written there was no available device, and 
> know that at least several companies are working on devices. How will 
> I know (before the AHJ knows :-) that residential-scale products are 
> available for purchase, and at what point would you say now should be 
> required over every other option?
>
> Second question: I have an inspector insisting that the solar PV 
> system is the same as a utility service, and is requiring all of the 
> required service code references to apply. Anybody have a concise 
> reference that might convince him otherwise? This same inspector has 
> decided that the electrical permit will have adders for each inverter 
> as service equipment, and each module as an electrical device. It 
> would sure be nice if there was more consistency...we're still in the 
> early adopter phase here in Minnesota.
>
> Thanks in advance for your input.
>
> Keep Shining!
> Rebecca Lundberg
> NABCEP Certified Solar PV Installer ®
> Owner/CEO, Powerfully Green
> Rebecca.Lundberg at PowerfullyGreen.com
> 763-438-1976
>
>
>
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