[RE-wrenches] 2008 690.31

[Geoff Greenfield]

This sounds less expensive than fencing all ground mount arrays (one
interpretation of code).  We were thinking of installing unistrut as a
wire trough right behind the panels as close as we could... this still
leaves about 2" of USE-2 pigtail from the J-box to the trough... if this
is good enough is up to the AHJ?

For a brighter energy future,

Geoff Greenfield
President

Third Sun Solar & Wind Power Ltd.
340 West State street, Unit 25
Athens, Ohio 45701
(740) 597-3111   fax: (740)597-1548
www.third-sun.com

Clean Energy - Expertly Installed


-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Carl Adams
Sent: Wednesday, November 11, 2009 9:30 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] 2008 690.31

Dave,

I'd be interested in seeing pictures of your work here.  We have
several ground mount systems upcoming.

Thanks
Carl


On Tue, Nov 10, 2009 at 8:51 PM, David Palumbo
<dave at independentpowerllc.com> wrote:
> William,
>
>
>
> From 2008 Handbook (actual codebook is not at my desk at this time).
>
> IV. Wiring Methods
>
> 690.31 Methods Permitted
>
> (A)  Wiring Systems. All raceway and cable wiring Methods included in
this
> Code and other wiring systems and fittings specifically intended and
> identified for use on photovoltaic arrays shall be permitted. Where
wiring
> devices with integral enclosures are used, sufficient length of cable
shall
> be provided to facilitate replacement.
>
> Where photovoltaic source and output circuits operating at maximum
system
> voltages greater than 30 volts are installed in readily accessible
> locations, circuit conductors shall be installed in a raceway.
>
>
>
> Highlighted note in Handbook: Most PV modules do not have provisions for
> attaching raceways. These circuits may have to be made “not readily
> accessible” by use of physical barriers such as wire screening.
>
>
>
> It goes on with a FPN on temperatures and then continues with sections
(B)
> thru (F);  which someone with the CD could paste for us.
>
>
>
> I assumed you were interested primarily in (A) William. We are using a
> screening method on DPW TPM that works well for us. We are using an
outdoor
> plastic lattice, white in color, that we buy at Lowes and custom cut for
our
> specific needs. We use it to screen any MC cables that are within 8 feet
of
> ground level. I could send anyone interested a picture if they e-mail
and
> request. To bring our wiring down from the PV modules we enter the DPW
> gimbal thru a Hubbell ¾” 90 degree cord grip (DPW has a knock out for
such)
> and then we exit the steel pipe mast directly into the back of a PVC
j-box
> thru a 2-1/2” hole we make in the pipe, we weld a 6x6 plate onto the
hole
> for the j-box and protect the wiring coming out of the pipe mast with a
> short piece of PVC that is bushed on both ends. After the j-box we are
all
> SCHD 80 PVC before transitioning to schedule 40 under ground.
>
>
>
> Dave
>
>
>
>
>
> From: re-wrenches-bounces at lists.re-wrenches.org
> [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of William
> Miller
> Sent: Tuesday, November 10, 2009 6:14 PM
> To: RE-wrenches
> Subject: [RE-wrenches] 2008 690.31
>
>
>
> Friends:
>
> I have not received my 2008 NEC on CD.  Pending it's arrival, could one
of
> you good folks please post 690.31 to the wrenches as a personal favor to
me?
>
> Thanks in advance.
>
> William Miller
>
>
> Please note new e-mail address and domain:
>
> William Miller
> Miller Solar
> Voice :805-438-5600     Fax: 805-438-4607
> email: william at millersolar.com
> http://millersolar.com
> License No. C-10-773985
>
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