[RE-wrenches] Help understanding 690.12/Ul 3741 and Ironridge

[Rebekah Hren]

Hi,
3741 requires a combination of devices used as a system, so if you look at
that Ironridge doc, it appears their 3741 listing is effective only when
using Tesla (with MCIs) or Solis (with Midnite MNSSR) plus the modules
listed at the end.

So... no SolArk.





On Tue, Oct 14, 2025 at 12:16 PM Jay via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> I got curious
>
>
> As I understand it there are 2 variations.
> 1 is with the inverter within 1-3’ of the array and that includes having
> listed by IR panels and inverters. Which is usually commercial jobs.
>
> 2 is the inverter is further than 1-3’ from the array. It’s almost the
> same with only certain listed panels and inverters and remote shut down
> equipment
>
> Here is the link that talks about the second version.
>
>
> https://files.ironridge.com/pitched-roof-mounting/resources/brochures/IronRidge_XR_Flush_Mount_UL3741_Installation_Addendum.pdf
>
>
>
>
> On Oct 14, 2025, at 1:06 PM, david quattro via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
> 
> I think for 3741 without RSD devices, the inverter would have to be
> mounted within 1 ft of the array.
>
> On Tue, Oct 14, 2025 at 11:01 AM Michael Morningstar via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>>
>> Wrenches,
>>
>> I do not do a lot of rooftop array work and am having trouble
>> understanding something related to 690.12 and UL 3741. I have a potential
>> client who is building a new permitted home and has plans approved for a
>> rooftop array and Sol-Ark/Discover AES battery back up. He has asked me to
>> quote the install and after looking at his plans, I noticed an absence of
>> MLPE's. I brought this to his attention and he sent me XR FLUSH MOUNT UL
>> 3741 PV HAZARD CONTROL INSTALLATION ADDENDUM. His interpretation is that
>> Ironridge's racking system negates the need for MLPE's, or that the racking
>> is an alternative to using MLPE's. I'm just not seeing it. Am I missing
>> something or?
>>
>> Thanks,
>> Michael
>>
>> --
>>
>> Michael Morningstar
>>
>>
>> Morningstar Electric Inc
>>
>> PO Box 1494
>>
>> Mount Shasta, CA 96067
>>
>> 530-921-0560
>>
>> CSLB 1116835
>>
>> mjmorningstar at gmail.com
>>
>>
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