[RE-wrenches] Looking for insulated #6 bare standoff
cwarfel
cwarfel at entech-engineering.com
Fri Apr 20 14:38:48 EDT 2018
It's just not Idaho. I was just asked about NEC PV interpretation for a
large city on the East coast. Same problem. Narrowly (and incorrectly)
interpreting the grounding requirements.
It's probably nervous inspectors who feel their neck is on the line, and
are interpreting defensively thinking that is the safest thing for them
to do. We have taught a lot of Code officials and they really feel
exposed when it comes to PV.
The key to me is just taking time, if the Building Official has it, to
go over the NEC sections and their relevance. It has to be made
understandable and easy. These people are suppose to approve everything
from house wiring to appliances to pools, to anything that requires a
permit. It is just too much for almost everyone to understand
completely. Look at all the questions we have with 690 and 705 alone
Chris.
On 4/20/2018 1:28 PM, Dana wrote:
>
> Reasonable inspector, here? You have no idea.
>
> The plans examiner is the first link in the process here in Idaho, he
> is; by the book, crossing t’s & dotting I’s and has a very strict &
> narrow interpretation of the code. That said he is very helpful and a
> nice guy. It’s an Idaho thing.
>
> ----------------------------------------------------------------------------
>
> Dana Orzel Great Solar Works, Inc.
>
> *C - 208.721.7003 dana at solarwork.com*
>
> Idaho Contractor - # 028765 Idaho PV # 028374
>
> NABCEP # 051112-136 www.solarwork.biz <http://www.solarwork.biz>
>
> _"Responsible Technologies for Responsible People since 1988" ___
>
> *P*Please consider the environment before printing this email.
>
> *From:*RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> *On
> Behalf Of *cwarfel
> *Sent:* Friday, April 20, 2018 9:23 AM
> *To:* re-wrenches at lists.re-wrenches.org
> *Subject:* Re: [RE-wrenches] Looking for insulated #6 bare standoff
>
> I just got back from being out of the office for a week+ and just read
> a few of these. I hope this is not redundant.
>
> 6AWG is the size that meets several tests for exposed installations.
> By that I mean that it is not protected. If you are running the array
> EGC exposed, you would use at least 6AWG depending upon the size of
> the overcurrent protection device towards the charge controller/array
> disconnect. 250.120(C) and T250.122.
>
> We have run into the conductor covering rating problem too. #4 can be
> color coded so you can use black conductor. A reasonable inspector
> should allow this for 6 since a lot of the non black coverings are not
> holding up as well to sunlight as black. I think NEC2017 takes this
> into consideration and allows you to color code because of the
> superior performance of black coverings.
>
> Chris
>
> On 4/20/2018 9:00 AM, Dana wrote:
>
> That makes two of us that would like to understand, why #6? I think it dates to early grounding with grid tie systems.
>
> I remember back to 20+ years ago when the code required that the EGC was the size of the largest conductor which with 24 volt inverters was OOOO.
>
> ----------------------------------------------------------------------------
>
> Dana Orzel Great Solar Works, Inc.
>
> C - 208.721.7003dana at solarwork.com <mailto:dana at solarwork.com>
>
> Idaho Contractor - # 028765 Idaho PV # 028374
>
> NABCEP # 051112-136www.solarwork.biz <http://www.solarwork.biz>
>
> "Responsible Technologies for Responsible People since 1988"
>
> P Please consider the environment before printing this email.
>
> -----Original Message-----
>
> From: RE-wrenches<re-wrenches-bounces at lists.re-wrenches.org>
> <mailto:re-wrenches-bounces at lists.re-wrenches.org> On Behalf Of Dave Angelini Offgrid Solar
>
> Sent: Thursday, April 19, 2018 3:57 PM
>
> To: RE-wrenches<re-wrenches at lists.re-wrenches.org>
> <mailto:re-wrenches at lists.re-wrenches.org>
>
> Subject: Re: [RE-wrenches] Looking for insulated #6 bare standoff
>
> Dana, I understand the need to use #6 in exposed places on the earth. I have had inspectors require the same wire size that is used to the battery. I have had them require the same size as the array wiring. I have never seen them do what they are doing to you so thanks for the info.... Be well! --Dave
>
> The bare #8 is an EGC for #10 USE PV wire on the tracker to the array
>
> mounted combiner box.
>
> ----------------------------------------------------------------------------
>
> Dana Orzel Great Solar Works, Inc.
>
> C - 208.721.7003dana at solarwork.com <mailto:dana at solarwork.com>
>
> Idaho Contractor - # 028765 Idaho PV # 028374
>
> NABCEP # 051112-136www.solarwork.biz <http://www.solarwork.biz>
>
> "Responsible Technologies for Responsible People since 1988"
>
> ï Please consider the environment before printing this email.
>
> -----Original Message-----
>
> From: RE-wrenches<re-wrenches-bounces at lists.re-wrenches.org>
> <mailto:re-wrenches-bounces at lists.re-wrenches.org> On
>
> Behalf Of Hilton Dier
>
> Sent: Thursday, April 19, 2018 3:39 PM
>
> To:re-wrenches at lists.re-wrenches.org
> <mailto:re-wrenches at lists.re-wrenches.org>
>
> Subject: [RE-wrenches] Looking for insulated #6 bare standoff
>
> Would #8 meet code? I thought that exposed ground wire had to be #6
>
> minimum.
>
> Hilton Dier III
>
> Renewable Energy Design
>
> Missisquoi River Hydro LLC
>
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> --
>
> Christopher Warfel, PE
> ENTECH Engineering, Inc.
> PO Box 871, Block Island, RI 02807
> (401)466-8978
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Christopher Warfel, PE
ENTECH Engineering, Inc.
PO Box 871, Block Island, RI 02807
(401)466-8978
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