[RE-wrenches] Location of DC disconnect vis-a-vis rapid shutdown exemption
Ray
ray at solarray.com
Mon Apr 16 21:00:45 EDT 2018
For GT using Solar edge or Enphase, its not so hard to comply, but If
you are looking at off grid systems, it's not just someone's opinion,
its $1,000s of dollars extra to comply with 690.12. It also results in a
system that is less reliable, which is less safe off grid where lives
depend on that power for heat, light, refrigeration, and even breathing
machines.
Ray Walters
Remote Solar
On 4/16/18 7:44 AM, Brian Mehalic wrote:
> Hey y'all, I'm going to disagree about the NEC getting "worse and
> worse when it comes to PV," (see disconnect and grounding
> requirements, for instance!), but as with previous posters, that's
> just an opinion.
>
> Regarding location - the 2014 version had very little to say about the
> location of any rapid shutdown initiation device; 2017 adds the
> requirement [690.12(C)] that RS initiation devices for one- and
> two-family dwellings be readily accessible (defined in Article 100),
> AND outside the building. Seems reasonable for a device that is
> intended to control energized conductors to make it more safe to enter
> a building.
>
> Cheers,
>
>
> Brian Mehalic
> NABCEP Certified Solar PV Installation Professional™ R031508-59
> 520.204.6639
>
> Solar Energy International
> http://www.solarenergy.org
>
> SEI Professional Services
> http://www.seisolarpros.com <http://www.seisolarpros.com>
>
>
> On Mon, Apr 16, 2018 at 12:04 AM, Mark Frye <markf at berkeleysolar.com
> <mailto:markf at berkeleysolar.com>> wrote:
>
> Thanks Darryl.
>
> I guess I can add that I am in CA and so looked only at the 2014.
> I also looked at the 2017 article. Man, I have to say, my
> impression remains that really starting with 2008 the code has
> just gotten worse and worse when it comes to PV, but that is just me.
>
> Not really sure what might need to be "Outside readily
> accessible". Is there something other than 690.12 that I need to
> look at?
>
> Mark
>
> On 4/15/2018 8:26 PM, Darryl Thayer wrote:
>> I think the code says Outside readily accessible,
>>
>> On Sun, Apr 15, 2018 at 12:22 PM, Mark Frye
>> <markf at berkeleysolar.com <mailto:markf at berkeleysolar.com>> wrote:
>>
>> Folks,
>>
>> As I recall, an inverter and it's integrated DC disconnect
>> need only be placed in an accessible location. I am thinking
>> of putting an inverter high up on the wall inside a garage.
>> That would be OK vis-a-vis the location of the disconnect
>> (still accessible for maintenance).
>>
>> If I do put the inverter high up on the wall, I can limit my
>> DC conductors to less that 10 feet total from the array and
>> less that 5 feet inside the garage.
>>
>> That means I get the exemption from the rapid disconnect
>> requirement, right?
>>
>> There is nothing in the Code linking the accessibility of the
>> DC disconnect to the exemption from rapid shutdown, right?
>>
>> Mark Frye
>>
>>
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