[RE-wrenches] Code reference request

[Rebekah Hren]

If you are on 2014:
 690.47(B)

An ac equipment grounding system shall be permitted

to be used for equipment grounding of inverters and other

equipment *and for the ground-fault detection reference for *
 *ungrounded PV systems.*

and 690.47(C)(3)

*For ungrounded systems, this con**ductor shall be sized in accordance with
250.122 *and shall

not be required to be larger than the largest ungrounded

phase conductor.

On Tue, Oct 28, 2014 at 2:22 PM, Gary Willett <Gary at icarussolarservices.com>
wrote:

> Kirk:
>
> A DC grounding electrode conductor (GEC) is not required for inverters
> that do NOT have a ground reference for the PV+ and PV- conductor(s) from
> the PV array.
>
> A GEC is not required if the string inverter is one of the new TL
> (transformerless) types.  Also, this applies to micro-inverters such as the
> new Enphase M250 and later versions of the M215.
>
> Where this applies, only a properly sized equipment grounding conductor
> (EGC) is required.
>
> The EGC is sized according to [NEC 690.45] and can be a minimum of #14AWG
> when not exposed to damage, or #6AWG when exposed to potential damage.
>
> Regards,
>
> Gary Willett PE
> Icarus Engineering LLC
>
>
> On 10/28/14, 12:53 PM, Kirk wrote:
>
>> Hi,
>> I'm on a jobsite without my code book. Could someone tell me where in the
>> code ungrounded systems do not require the inverter GEC? Basically my
>> onsite electrician doesn't believe me. Thanks.
>>
>> Kirk Herander
>> VSE
>> _______________________________________________
>> List sponsored by Redwood Alliance
>>
>> List Address: RE-wrenches at lists.re-wrenches.org
>>
>> Change listserver email address & settings:
>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>>
>> List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.
>> org/maillist.html
>>
>> List rules & etiquette:
>> www.re-wrenches.org/etiquette.htm
>>
>> Check out or update participant bios:
>> www.members.re-wrenches.org
>>
>>
> _______________________________________________
> List sponsored by Redwood Alliance
>
> List Address: RE-wrenches at lists.re-wrenches.org
>
> Change listserver email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
> List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.
> org/maillist.html
>
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm
>
> Check out or update participant bios:
> www.members.re-wrenches.org
>
>


-- 
Tel: 336.266.8800
http://o2energies.com/
Project Engineer
NABCEP Certified PV Installation Professional™ 091209-85
NC Licensed Electrical Contractor

This message, together with any attachments, is intended only for the named
recipient(s).   It may contain confidential or privileged information that
may be exempt from disclosure under applicable law.  If you are not the
intended recipient(s), you are notified that the disclosure, dissemination,
distribution, copying, storing, or other use of the contents of this
message or its attachments is strictly prohibited.  If you receive this
message in error, or are not the named recipient(s), please notify the
sender at either the email address or telephone number above and delete
this email from your computer.  Thank you.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20141028/88c25a9d/attachment-0002.html>