[RE-wrenches] Rapid shutdown for pole mounts
Dave Click
daveclick at fsec.ucf.edu
Fri Jun 27 10:15:02 PDT 2014
Thanks to Nick for catching a misstatement in my email, corrected below
in *bold*. I was trying to make a general statement out of his specific
situation.
On 2014/6/26, 10:20, Dave Click wrote:
> NEC says 10' from the array, defined as "A mechanically integrated
> assembly of modules or panels with a support structure and foundation,
> tracker, and other components, as required, to form a direct-current
> power-producing unit. 70HB14_CH00_FM_pi_xii.pdf " I take this to mean
> that the "array" definition includes support structure, so you could
> go 10' from the bottom of the pole?
>
> But that doesn't matter, as rapid shutdown requirements only apply to
> PV systems *[conductors]* "on or in" buildings; it only applies to a
> ground-mounted system if you bring the dc all the way into *or
> onto***a building (*if you are >10' from the array or >5' within the
> structure*). So, Rapid Shutdown doesn't apply at all to your scenario
> where only the ac wiring from a pole mount enters the building.
>
> DKC
>
>
> On 2014/6/25, 12:00, Jesse Dahl wrote:
>> Re-reading this rapid shutdown convo.
>>
>> Does 10' from the array mean from the modules or the "mount"? What
>> if the array is on a pole, the pole is 15' tall and the inverter is
>> mounted at the base of the pole? Since the array (modules) is 15'
>> from the inverter is rapid shutdown required?
>>
>> Again, since the title of 690.12 is "On Buildings" is it required for
>> pole mounts where only AC enters the building? Thoughts?
>>
>> Thanks!
>>
>>
>> Jesse
>>
>>
>> On Sat, Apr 19, 2014 at 12:22 PM, Dan Fink <danbob88 at gmail.com
>> <mailto:danbob88 at gmail.com>> wrote:
>>
>> Hi Aaron, boB, Wrenches;
>>
>> I think Aaron brings up a good point, and it's certainly
>> confusing to me.
>>
>> The boldface type heading of 690.12 is "Rapid Shutdown of PV
>> Systems on Buildings"
>>
>> The body of the 690.12 text begins with "PV system *circuits*
>> installed on or in buildings shall....."
>>
>> 690.2 defines "Photovoltaic source circuit" as "Circuits between
>> modules and from modules to the common connection point(s) of the
>> DC system"
>>
>> and "Photovoltaic output circuit" as "Circuit conductors between
>> the PV source circuit(s) and the inverter or DC utilization
>> equipment."
>>
>> "PV system" from the heading of 690.12 is not defined in 690.2,
>> other than that the definition of "Photovoltaic system voltage"
>> specifically includes both PV output and source circuits.
>>
>> To me the confusing part of 690.12 is "PV Systems on Buildings"
>> is that "system" is not defined, and tends to imply rooftop
>> arrays. But "PV system circuits installed on or in buildings
>> shall....." is pretty clear. I interpret it to mean anything DC
>> and PV stuck to the side of building like conduit, etc, or
>> running inside....which means it applies to ground-mount arrays
>> too if they terminate outside or inside the building.
>>
>> What I'm seeing as the easy work-around for us off-grid folk is
>> the old "power shed" idea containing battery bank, balance of
>> system, inverter etc....just build it within 10 feet of the PV
>> array and you're fine.
>>
>> Any thoughts?
>>
>>
>> Dan Fink,
>> Executive Director;
>> Otherpower
>> Buckville Energy Consulting
>> Buckville Publications LLC
>> NABCEP / IREC accredited Continuing Education Providers
>> 970.672.4342 <tel:970.672.4342>
>>
>>
>>
>> On Fri, Apr 18, 2014 at 3:30 PM, boB at midnitesolar.com
>> <mailto:boB at midnitesolar.com> <boB at midnitesolar.com
>> <mailto:boB at midnitesolar.com>> wrote:
>>
>>
>> Bill Brooks should probably respond to this also, but reading
>> the NEC, it looks like if the wires
>> do not go inside the building to run more than 5 feet (as the
>> crow flies), the the rapid disconnect
>> does not apply. OR, less than 10 feet from the array IF
>> the PV is mounted on that building.
>>
>> boB
>>
>>
>>
>>
>> On 4/18/2014 1:34 PM, Aaron Mandelkorn wrote:
>>
>> The rapid shutdown language is so confusing. When looking
>> at the rapid shutdown language, does PV systems "on" a
>> building refer to only situations where the array is on a
>> building; or does it include DC conductors as well. For
>> example, if the DC conductors from a pole mounted array
>> run up the side of a building before punching in to the
>> inverter, does this require rapid shutdown? Is this PV
>> system considered "on" a building?
>>
>> Aaron
>>
>> Aaron Mandelkorn
>> Owner/Solar Specialist
>> Renewable Energy Outfitters
>> 719-221-5249 <tel:719-221-5249>
>> 970-596-3744 <tel:970-596-3744>
>> www.reosolar.com <http://www.reosolar.com>
>> reosolar at gmail.com <mailto:reosolar at gmail.com>
>>
>>
>>
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