I'm a fan of talking to the inspector directly for their take. Explain the situation. It seems like having 2" of PVC inside a TA and mounting a metal jbox as low as possible and transitioning to metal from there should be reasonable.
On Wed, May 20, 2026, 8:58 PM Jerry Shafer via RE-wrenches < [email protected]> wrote: > Wrenches. Conduit issue, > If it is Unprotected then you need sch 80 but as it is going through > concrete weed trimming is not really an issue, that is in my JHD anyway. > > > On Wed, May 20, 2026, 3:42 PM Chris Sparadeo via RE-wrenches < > [email protected]> wrote: > >> Not sure your exact situation, but a 230.6 argument could potentially be >> made, as this exemption is often applied to “other than service >> conductors”. Installed under min 2” of concrete can be considered “outside >> of the building”. >> >> >> On Wed, May 20, 2026 at 2:05 PM William Miller via RE-wrenches < >> [email protected]> wrote: >> >>> I had a similar problem with PVC pre-installed through a roof. It was >>> big enough pipe to run flex through and pull our PV runs. >>> >>> As to the requirement to use metallic, I haven’t had my second cup of >>> coffee yet so I won’t comment. >>> >>> William Miller >>> Miller Solar.com >>> 805-438-5600 >>> www.millersolar.com >>> >>> On Wed, May 20, 2026 at 10:36 AM Mick Abraham via RE-wrenches < >>> [email protected]> wrote: >>> >>>> Hi, Mechanics ~ >>>> >>>> The general contractor put in a 2" PVC pipe before pouring the slab. >>>> The pipe has a 90 degree sweep so there's a vertical pipe stub. >>>> He thought there would be no code inspections for this remote >>>> property... oops. >>>> >>>> I now must use this plastic pipe for incoming PV wires. These wires >>>> will terminate on a MidNite Power MN15‑12KW‑AIO, so question one: >>>> Without embarrassing myself, can I argue that this qualifies for the >>>> exemption as a PV ICS (Photovoltaic Integrated Control System)? >>>> The PV arrays will be on top of an open horse shed, so I don't plan on >>>> any form of "rapid shutdown". >>>> >>>> Assuming that the above exemption won't get me off the hook, what are >>>> your suggestions for retrofit? My five wires could comfortably fit 1" trade >>>> size EMT >>>> conduit. If I cut the PVC stub then glue on a male adapter (so I could >>>> mount a metal box low to the floor), there's still some unprotected plastic >>>> due to the hub of the male adapter. >>>> >>>> Also: what would have been better initial tradecraft in a non-retrofit >>>> slab situation, assuming that one wants to use PVC for most of the pipe run >>>> while still satisfying >>>> NEC 690.31(D) (1)? >>>> >>>> Thanks in advance, Mechanix. "The Wrench List is the Bomb!" >>>> >>>> Mick Abraham, Proprietor >>>> www.abrahamsolar.com >>>> >>>> Cell phone or for text messaging: 970-946-6584 >>>> _______________________________________________ >>>> List sponsored by Redwood Alliance >>>> >>>> Pay optional member dues here: http://re-wrenches.org >>>> >>>> List Address: [email protected] >>>> >>>> Change listserver email address & settings: >>>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>>> >>>> There are two list archives for searching. 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