[RE-wrenches] Listed systems

[Jason Szumlanski]

I have successfully argued numerous times that section 690.31, in its
entirety, refers to the DC conductors of a photovoltaic system only. The DC
conductors of the listed PV module are the only conductors that would fall
under this section.

The fact that Enphase uses Type DG cable for the inverter output circuit
does not mean it needs to comply with NEC 690.31(C), although it does.

Enphase had a tech brief titled "Planning for an IQ Microinverter System"
that has information about the listing and specifications of their Q Cable
that might be helpful.

If I were responding to this plan reviewer, my response would be simply
that the section cited does not apply to the inverter output circuit.


Jason Szumlanski
Principal Solar Designer | Florida Solar Design Group
NABCEP Certified Solar Professional (PVIP)
Florida State Certified Solar Contractor CVC56956
Florida Certified Electrical Contractor EC13013208


On Fri, Apr 4, 2025 at 5:50 PM William Miller via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

>
> Friends:
>
> There is nothing like an argument with a building official to make me
> question my sanity.
>
> We are permitting an Enphase system. The plan checker says we are required
>  to declare our PV wiring is in compliance with 690.31.
>
> As I read 690.31 the first paragraph tells me the section does not apply
> because we are installing a listed system. The PV leads are covers under
> the module listing and the Q cable under the Enphase listing. There are no
> jumpers. 690.31 says listed systems “shall be permitted.”
>
> The wording is a bit confusing but that is my interpretation.
>
> Am I missing something?
>
> Thanks in advance.
>
>
> William Miller
> Miller Solar.com
> 805-438-5600
> www.millersolar.com
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