[RE-wrenches] burnt wire

[Tump]

I would agree loose or not retightened connection. We use ferrels and Cobra X Flex # 6 awg wire, great to work with and those fine strands within the ferrels compress much better then Cu. 
> On Jan 31, 2022, at 9:00 PM, Maverick Brown <maverick at mavericksolar.com <mailto:maverick at mavericksolar.com>> wrote:
> 
> Looks like the wire was not completely seated in the back of the terminal before the set screw was tightened, the set screw grabbed a strand or two and felt as though it was tight, etc. or the screw wasn’t tightened enough. The resistive connection led to a lot of heat causing the insulation to burn. I prefer using ferrules on those big terminals when using smaller than maximum size wire. 
> 
> Maverick Brown
> Off-Grid Solar Commander since 2006
> Maverick Solar Enterprises, Inc.
>  • Solar Commander Remote Power
>  • SunFlow Systems Cathodic Protection 
> maverick at mavericksolar.com <mailto:maverick at mavericksolar.com>
> 512-460-9825
> 
> 
>> On Jan 31, 2022, at 7:51 PM, Dave Tedeyan <dave at sungineersolar.com <mailto:dave at sungineersolar.com>> wrote:
>> 
>> 
>> Hi All,
>> 
>> I was troubleshooting a Schneider system today (not my install, so I don't know the history) and came across a wire where the insulation actually burnt off. See the attached photo. I have never seen anything like it. Does anyone know how this could happen? It was a Conext MPPT 80 600 charge controller going to a 100A breaker, with what appears to be #2 CU wire. This is in a heated shed, and there is no evidence of water leakage. The charge controller was still working just fine. And it was only that last 6" or so of the wire, the rest of it appeared to be fine.
>> 
>> Cheers,
>> Dave
>>  
>> -- 
>>  <https://www.sungineersolar.com/>	
>> Dave Tedeyan, P.E.
>> Owner | Sungineer Solar
>> p: he | him | his
>> a: 1653 Slaterville Rd. | Ithaca, NY 14850
>> w: www.sungineersolar.com <http://www.sungineersolar.com/>
>> c: (607) 288-2898
>> <PXL_20220131_161735713.jpg>_______________________________________________
>> List sponsored by Redwood Alliance
>> 
>> Pay optional member dues here: http://re-wrenches.org <http://re-wrenches.org/>
>> 
>> List Address: RE-wrenches at lists.re-wrenches.org <mailto:RE-wrenches at lists.re-wrenches.org>
>> 
>> Change listserver email address & settings:
>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org <http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org>
>> 
>> There are two list archives for searching. When one doesn't work, try the other:
>> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ <https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/>
>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org>
>> 
>> List rules & etiquette:
>> http://www.re-wrenches.org/etiquette.htm <http://www.re-wrenches.org/etiquette.htm>
>> 
>> Check out or update participant bios:
>> http://www.members.re-wrenches.org <http://www.members.re-wrenches.org/>
>> 
> _______________________________________________
> List sponsored by Redwood Alliance
> 
> Pay optional member dues here: http://re-wrenches.org <http://re-wrenches.org/>
> 
> List Address: RE-wrenches at lists.re-wrenches.org <mailto:RE-wrenches at lists.re-wrenches.org>
> 
> Change listserver email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org <http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org>
> 
> There are two list archives for searching. When one doesn't work, try the other:
> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
> 
> List rules & etiquette:
> http://www.re-wrenches.org/etiquette.htm
> 
> Check out or update participant bios:
> http://www.members.re-wrenches.org
> 






"We must all learn to live together as brothers,
 or we all will perish as fools."
MLK







> Tump <blocked::mailto:Tump at swnl.net%22%20%5Co%20%22blocked::mailto:Tump at swnl.net>3391 at gmail.com       www.SWNL.net <blocked::http://www.swnl.net/%22%20%5Co%20%22blocked::http://www.swnl.net/>
>                 Solarwinds Northernlights       
>        Serving Mid Coast Maine & Northern California
>                          207-832-7574   Cl. 610-517-8401                              
>                               Blair "TUMP" May
>                ********  MAINE'S CHARTER ********
>                       NABCEP    "Certified PV Installer" 
>    
>               ********  MAINE'S CHARTER ********
>                   Trace Xantrex "Certified" Dealer / Installer"
> 



-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches_lists.re-wrenches.org/attachments/20220201/3f18ec22/attachment.htm>