[RE-wrenches] 2008 690.31

R Ray Walters ray at solarray.com
Tue Nov 10 17:56:17 PST 2009


Sounds like a very nice install Dave, I'd like to see pictures if you  
could.

Thanks,

R. Walters
ray at solarray.com
Solar Engineer




On Nov 10, 2009, at 6:51 PM, David Palumbo 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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