<div dir="ltr" gmail_original="1"><div><div class="gmail_default" style="font-family: arial, helvetica, sans-serif;">The inspector just seems to be misinformed about the requirements for DC and AC conductors in a PV system. Time to go back to school. Here is how I would reply:</div><div class="gmail_default" style="font-family: arial, helvetica, sans-serif;"><br></div><div class="gmail_default" style="font-family: arial, helvetica, sans-serif;">-----------</div><div class="gmail_default" style="font-family: arial, helvetica, sans-serif;">Section 690.6, in its entirety, is irrelevant. A separate solar module and microinverter is not an AC module. </div><div class="gmail_default" style="font-family: arial, helvetica, sans-serif;"><br></div><div class="gmail_default" style="font-family: arial, helvetica, sans-serif;">The NM Cable in the attic is an inverter output circuit. Sections 690.7 and 690.31 do not apply. These sections address the DC PV source and output circuits only, not the AC Output circuit of an inverter.</div><div class="gmail_default" style="font-family: arial, helvetica, sans-serif;"><br></div><div class="gmail_default" style="font-family: arial, helvetica, sans-serif;">You are almost certainly looking at the 2020 code, section 690.7(D), which did not apply to the inverter output circuit. Regardless, this section was deleted from the 2023 edition, which is the applicable code for this installation. Section 690.31 was rearranged from NEC 2020 to 2023, but the same requirement for <b>DC conductors </b>over 30V applies. However, the entire Section 690.31 is irrelevant to inverter output circuits, which are AC circuits.</div><div class="gmail_default" style="font-family: arial, helvetica, sans-serif;"><br></div><div class="gmail_default" style="font-family: arial, helvetica, sans-serif;">There is no such requirement for the 240V AC inverter output circuit to be in conduit as long as it is an approved wiring method for an AC branch circuit. NM Cable is an approved wiring method in this context. It does not require guarding or raceways when installed in an attic space, just like any other branch circuit.</div><div class="gmail_default" style="font-family: arial, helvetica, sans-serif;">-----------</div></div><div class="gmail_default" style="font-family: arial, helvetica, sans-serif;"><br></div><div class="gmail_default" style="font-family: arial, helvetica, sans-serif;"><br></div><div class="gmail_default" style="font-family: arial, helvetica, sans-serif;">With all that said, we stopped using NM cable for microinverter output circuits, not because of code issues, but we just prefer to standardize on conduit, especially because there are usually multiple circuits on a roof. Sometimes we might use NM cable for jumpers between roofs if it adds to our convenience, but that only works for decking mounted junction boxes like EZ Solar JB-1, JB-2, or Soladecks. </div><div><div dir="ltr" class="gmail_signature"><div dir="ltr"><br>Jason Szumlanski<div><span style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;">Principal Solar Designer | Florida Solar Design Group</span><br style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;"><span style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;">NABCEP Certified Solar Professional (PVIP)</span><br style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;"><span style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;">Florida State Certified Solar Contractor CVC56956</span></div><div><font color="#333333" face="Roboto, RobotoDraft, Helvetica, Arial, sans-serif">Florida Certified Electrical Contractor EC13013208</font></div></div></div></div><br></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Sat, Mar 7, 2026 at 12:07 AM scot.arey--- via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote:<br></div><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div class="msg-2619945931053266479">
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Read and reply only if you want to stick it to an inspector 🙂</div>
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System is 19 modules with Enphase IQ8: NM through attic and he insists it must be guarded or in conduit. His comment back to me on why he failed the inspection and I tried to tell him that the IQ8 output is not a PV source circuit.</div>
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<span style="font-family: Aptos, sans-serif; font-size: 12pt; color: rgb(36, 36, 36);"><i>Good afternoon, I have just read your email and would like to inform you that your code reference is spot on. 690.6 A PV
</i></span><span style="font-family: Aptos, sans-serif; font-size: 12pt; color: rgb(36, 36, 36); background-color: yellow;"><i>Source</i></span><span style="font-family: Aptos, sans-serif; font-size: 12pt; color: rgb(36, 36, 36);"><i> Circuit refers to a NRTL
Listed assembly and is exclusive to the wiring from the Panel to the Microinverter, it as a listed assembly is not subject to the DC rules of 690.. 690.6 b refers to the Inverter Output Circuit and is not exempt from the rules of 690.7 Circuit Requirements,
Specifically D which states, “Circuits over 150 volts to ground. In one and two family dwellings, live parts in PV source circuits and PV output circuits over 150 volts to ground Shall Not be accessible to other than qualified persons while energized. The
commentary for this code states, Conduit, closed cabinets, or enclosures that require tools to open them are means of limiting access to qualified persons only. These circuits are production and not utilization circuits and therefore must be protected from
physical damage and errant tampering. As was noted at Plan Review</i></span></p>
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<span style="font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(36, 36, 36);"><i>Dd</i></span></p>
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My proposed response:</div>
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I have read your reply and believe you have mis-cited code references. You wrote:</div>
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<i>"690.6 b refers to the Inverter Output Circuit and is not exempt from the rules of 690.7 Circuit Requirements, Specifically D which states, “Circuits over 150 volts to ground. In one and two family dwellings, live parts in PV source circuits and PV output
circuits over 150 volts to ground Shall Not be accessible to other than qualified persons while energized."</i></div>
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690.6b is here.</div>
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690.7 (D) does not reference "circuits over 150-volts..." but is pasted here. This is a reference to marking of direct current (DC) PV circuits. This does not apply because the inverter output circuit is not a "DC PV Circuit."</div>
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The section that almost refers to "<i>PV output circuits over 150 volts to ground Shall Not be accessible"
</i>is not in NEC 2023 which is what Temple uses. I have pasted the 2020 language, which is not the language you cite to me, and even that is referring to "PV source and output" circuits and the NEC 2020 definition of "PV source and output" deals with DC.
I have pasted and highlighted that definition below.</div>
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So we are left with the fact that an inverter output circuit is alternating current, as defined under NEC 2023. Definition in Section 100:</div>
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<span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: black;">We are left with Chapter 3 wiring to address this AC circuit. There is no NEC 2023 reference to "</span><span style="font-family: Aptos, sans-serif; font-size: 12pt; color: black;">These
circuits are production and not utilization circuits and therefore must be protected from physical damage and errant tampering." Simply not in code.</span></p>
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If you insist I put the AC wire in conduit, please tell me the requirement. If it's "I just want it in conduit" then just ell me that. But there is little to justify it in NEC 2023.</div>
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<b>Howard "Scot" Arey</b></div>
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<b>Owner, Solar CenTex</b></div>
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NABCEP PV Installation Professional</div>
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TECL 29755</div>
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254-300-1228 </div>
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