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. 





On Oct 14, 2025, at 1:06 PM, david quattro via RE-wrenches <[email protected]> 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 <[email protected]> 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

[email protected]


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