Ray:
1. Why no fence? Aesthetics. Also costs may be a wash by the time you mobilize a fencing contractor. 2. I’d apply the same requirements to a fence as one would to an uncovered swimming pool. There are the same consequences if a child ends up in the wrong place. 3. Why bother? a. We figure the expense will decrease as we figure better design and implementation. Hasn’t yet. b. We care about safety. I figure we, as an industry, will kill a child by electrocution someday—it is a matter of probability. I hope it won’t be on one of our jobs. c. We hope, in some small way, we influence the industry to improve. 4. The industry has not developed solutions because there is no demand. There is no demand because AHJs don’t enforce the code. Thanks for the compliment. We have several new designs not yet featured on the web site. Check back next time this comes up. William PS: I am curious what Bill Brooks take on this is, but I don’t think I will agree with his interpretation. W [image: Gradient Cap_mini] Lic 773985 millersolar.com <http://www.millersolar.com/> 805-438-5600 *From:* RE-wrenches [mailto:[email protected]] *On Behalf Of *Ray Walters *Sent:* Friday, September 04, 2015 11:37 AM *To:* RE-wrenches *Subject:* Re: [RE-wrenches] Guarding against live parts 690.7 (D) 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 [image: Gradient Cap_mini] Lic 773985 millersolar.com <http://www.millersolar.com/> 805-438-5600 *From:* RE-wrenches [mailto:[email protected]] *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, <[email protected]> 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:[email protected] <javascript:_e(%7B%7D,'cvml','[email protected]');>] *On Behalf Of *Craig Gerald Buttke *Sent:* Thursday, September 03, 2015 11:44 AM *To:* [email protected] <javascript:_e(%7B%7D,'cvml','[email protected]');> *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 NABCEP Certified PV Installation Professional™ NABCEP Certified PV Technical Sales Professional™ State of WI: Master Electrician ------------------------------ [image: Avast logo] <https://www.avast.com/antivirus> This email has been checked for viruses by Avast antivirus software. www.avast.com <https://www.avast.com/antivirus> -- Sent from Gmail Mobile _______________________________________________ List sponsored by Redwood Alliance List Address: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/[email protected]/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
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