[RE-wrenches] EG4 Mini Split

[William Miller]

Ray:



You are referring to a distinction between “PV Source” versus “PV Output”
circuits.  Unfortunately, according to the code all “PV system circuits”
are considered when determining the requirement for RSS.  As I see it, the
disconnect you suggest does not remove the requirement for RSS if any “PV
System circuit” is “installed on or in” a structure that is intended for
any use in addition to housing PV equipment. This applies to a ground-mount
PV array.



I am not arguing the requirement makes sense—I believe it does not.  I am
just suggesting how a literal reading of the code would be interpreted.
Being able to understand this will prepare us to anticipate what a building
inspector or plan checker might require.



See text of code below.



*690.12 Rapid Shutdown of PV Systems on Buildings. **PV*

*system circuits installed on or in buildings shall include a rapid*

*shutdown function to reduce shock hazard for firefighters in*

*accordance with 690.12(A) through (D).*

*Exception: Ground-mounted PV system circuits that enter buildings,*

*of which the sole purpose is to house PV system equipment,*

*shall not be required to comply with 690.12.*



I would argue that if you could mount the outdoor portion of the mini-split
on a backboard or pad separated even inches from the home, you would not be
required to have RSS.



William



Miller Solar

17395 Oak Road, Atascadero, CA 93422

805-438-5600

www.millersolar.com

CA Lic. 773985





*From:* RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] *On
Behalf Of *Ray Walters via RE-wrenches
*Sent:* Thursday, June 19, 2025 8:34 AM
*To:* re-wrenches at lists.re-wrenches.org
*Cc:* Ray Walters
*Subject:* Re: [RE-wrenches] EG4 Mini Split



The PV circuit stops at the PV disconnect.  Put the PV disconnect on the
wall before it comes in, then RSS is NOT required.

Ray Walters
Remote Solar
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