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

Fri Sep 4 08:44:10 PDT 2015

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: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> 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

NABCEP Certified PV Installation Professional™

NABCEP Certified PV Technical Sales Professional™

State of WI: Master Electrician

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