[RE-wrenches] 2014/2017 NEC Code Adoption

[Jerry Shafer]

James
Tigo will work in both grid and off grid module disconnect requirements
Jerry

On Tue, Apr 2, 2019, 6:16 PM James Rudolph <jamesrudolph99 at gmail.com> wrote:

> Aloha Wrenches,
> I am in the process of familiarizing myself with the upcoming code
> adoptions here. Big Island has just adopted 2014 and Kauai (KIUC) just went
> to the 2017 NEC.
> Below is what I have gathered so far on the changes that would apply
> moving forward.
>
>
>    - 2014
>       - My understanding is that most string inverters should take care
>       of ground fault/arc fault compliance.
>       - Need a disconnect within 10’ of rooftop array (exterior wiring).
>          - Microinverters/optimizers automatically take care of this
>          - For PV systems without backup, (i.e. Mauna Loa) can also just
>          install a string inverter within the boundary (no additional cost other
>          than inverters in a bad location) which acts as the disconnect if the
>          inverter shuts down (i.e. turning the breaker off)
>             - For PV systems with backup, may need remote shutoff apart
>             from interconnection breaker
>          - Otherwise a disconnecting combiner is needed
>       - Labeling requirement changes
>    - 2017
>       - Changes the 10’ rule to 1’ on the disconnect
>       - Also requires control of conductors in the array (optimizers or
>       possibly string level disconnects)
>       - Better/cheaper products are likely on the way, but I haven’t seen
>       them yet
>
>
>
> Have I missed some things?
>
>
> Mahalo in advance.
>
>
>
>
> *James B. Rudolph*
>
> *HU*
>
> *Director of  Energy*
>
> *ES Electrician # 10816*
>
> *NABCEP Certified PV Installer # 091209-155*
>
> *808.594.9969*
>
>
>
>
>
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