[RE-wrenches] MC4s are listed for THWN, right?
Bryan Norkunas
Bryan at pv-cables.com
Mon Apr 26 12:28:54 EDT 2021
The MC4-Evo 2 isn’t the typical MC4 connector we are used to in the United States, these are commonly found in Europe, designed to meet European standards.
Standard MC4 on the left, EVO-2 on the right pictured below:
MC4 and MC4-Evo 2 portfolio first with new IEC certification
The MC4 pictured by Jason is not an EVo-2 connector and there for not approved for PVC cable.
Bryan Norkunas
From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Blake Gleason
Sent: Monday, April 26, 2021 9:24 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] MC4s are listed for THWN, right?
Bryan,
Thank you for the link. I am confused by the "PVC" section you referenced. Here's the complete text:
For safety reasons Stäubli prohibits the use of PVC cables. Cables made from PVC can be connected to MC4-Evo 2 since the insulation material of the connector (Polyamide) is suitable to be connected to PVC. PVC cables usually have an upper limiting temperature of 70 °C, in fixed installations sometimes 80 °C.
THHN/THWN-2 is made with PVC insulation, so I assume that it falls under the category of a "PVC cable."
So, the first sentence seems to say that it's not allowed by Staubli. But then the second sentence seems to say that is IS allowed. And then the third sentence doesn't seem to be contemplating the most common PVC wire type of all (in the US), which is THHN/THWN-2, which has a 90 degree rating?!
Can you help un-confuse me?
Thank you!
Blake
On Mon, Apr 26, 2021 at 8:55 AM Bryan Norkunas <Bryan at pv-cables.com> wrote:
Trying this again since my first link didn’t work, here is the link to the MFG specs for NON PV , low DC applications:
https://ec.staubli.com/AcroFiles/Technical%20Info/PV_SOL-LVDC_(en).pdf
For safety reasons Stäubli prohibits the use of thermoplastic PVC insulation cables.
Bryan Norkunas
From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Chris Sparadeo
Sent: Friday, April 23, 2021 8:30 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] MC4s are listed for THWN, right?
Also have to appreciate the 8 screws holding that 6x6”.
On Fri, Apr 23, 2021 at 12:13 AM Jay <jay.peltz at gmail.com> wrote:
Yes they are.
Their rating is based on wire size, number of strands, material, insulation thickness.
Insulation material isn’t specified.
Jay
Peltz power.
> On Apr 22, 2021, at 7:35 PM, Jason Szumlanski <jason at floridasolardesigngroup.com> wrote:
>
>
> I found this gem today while tracking down an AFCI fault. This was one of three strings connected to a Sunny Boy 9000TL. I was surprised at how rare and intermittent the AFCI fault was. The THWN pulled out effortlessly.
>
> I was surprised because usually I spend many hours tracking down AFCI problems only to find out it's a bad inverter.
>
> Jason
>
>
>
> <20210422_123715-resized-1024.jpg>
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