[RE-wrenches] Guarding against live parts 690.7 (D)

[Ray Walters]

WilIiam;

  checked out your guards on your website, that looks really clean, but 
also like a lot of work and expense.  I'm still so surprised 
manufacturers are not offering an option like that to their frame systems.
My question: how come you didn't just fence the array?  Shading issues 
on the south?
If fencing, what height of fence is considered adequate?  4 ft?  6 ft?

R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760

On 9/4/2015 9:44 AM, William Miller wrote:
>
> Gary:
>
> I think the issue of PV wiring behind module that are readily 
> accessible is addressed in (2014) 690.31:
>
> /Where PV source and output circuits operating at maximum/
>
> /system voltages greater than 30 volts are installed in/
>
> /readily accessible locations, circuit conductors shall be/
>
> /guarded or installed in a raceway./
>
> I am not sure what application the original poster had in mind, but 
> this is the question I think you are asking.  The interpretation to 
> 690.31 seems clear to me:  No one should be able to touch the 
> conductors without resorting to a ladder, opening a locked gate or 
> removing a protective panel.  Readily accessible is defined thusly:
>
> /Capable of being /
>
> /reached quickly for operation, renewal, or inspections/
>
> /without requiring those to whom ready access is requisite/
>
> /to actions such as to use tools, to climb over or remove/
>
> /obstacles, or to resort to portable ladders, and so forth./
>
> Implementing this is harder than it might seem.  Lacking a fence, the 
> installer must either use the flimsy solar-scrim product or fabricate 
> his or her own shielding.  We have put a fair amount of effort towards 
> this.  See link 
> <http://www.millersolar.com/MillerSolar/practices/PV_wiring/Wire_shielding/_Wire%20Shielding_history.html>.
>
> William
>
> Gradient Cap_mini
> Lic 773985
> millersolar.com <http://www.millersolar.com/>
> 805-438-5600
>
> *From:*RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org 
> <mailto:re-wrenches-bounces at lists.re-wrenches.org>] *On Behalf Of 
> *gary easton
> *Sent:* Friday, September 04, 2015 2:22 AM
> *To:* RE-wrenches
> *Subject:* Re: [RE-wrenches] Guarding against live parts 690.7 (D)
>
> Bill
>
> Are you  saying there is no requirement to shield wires on a ground array?
>
> On Friday, September 4, 2015, <billbrooks7 at sbcglobal.net 
> <mailto:billbrooks7 at sbcglobal.net>> wrote:
>
> Craig,
>
> This one is easy to misinterpret. You missed the words “live parts”. 
> This has been removed from the 2017 NEC because it is actually 
> referring to load circuits being fed directly by a PV system on the dc 
> side. All references to loads and batteries are being removed from 690.
>
> This is a complete non-issue.
>
> Bill.
>
> *From:*RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org 
> <javascript:_e(%7B%7D,'cvml','re-wrenches-bounces at lists.re-wrenches.org');>] 
> *On Behalf Of *Craig Gerald Buttke
> *Sent:* Thursday, September 03, 2015 11:44 AM
> *To:* re-wrenches at lists.re-wrenches.org 
> <javascript:_e(%7B%7D,'cvml','re-wrenches at lists.re-wrenches.org');>
> *Subject:* [RE-wrenches] Guarding against live parts 690.7 (D)
>
>
>
> How is everyone handling 690.7 (D)
>
> *Circuits over 150 Volts to Ground. *In one- and two- family 
> dwellings, live parts in photovoltaic source circuits and photovoltaic 
> output circuits over 150 volts to ground shall not be accessible to 
> other than qualified persons while energized.
>
>
>
> If you have a commercial (non one or two-family dwelling) are you 
> screening your ground mount arrays to keep people from touching live 
> conductors PV wires)?
>
> Thanks for your thoughts
>
> -- 
> Yours in Solardarity,
>   
> Craig Gerald Buttke
>   
> M:(715) 630-1227
> O:(715) 630-6451
> F:(715) 952-4501
>   
> North Wind Renewable Energy, LLC
> 1626C W Pearl Street
> Stevens Point, WI 54481
>   
> www.northwindre.com <http://www.northwindre.com>
>   
> NABCEP Certified PV Installation Professional™
> NABCEP Certified PV Technical Sales Professional™
> State of WI: Master Electrician
>
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