[RE-wrenches] EGC (and raceway) for LFP Battery Circuits

[William Miller]

If there is some kind of case flange in a convenient spot one might use one
of these:


On a related note: I installed 3 Deka Duration batteries wall-mounted in my
shop. The manufacturer provided no means to enclose conductors in a
raceway. I cobbled together some sections of 6x6 gutter with an opening cut
into each to enclose conductors. It worked out ok but was time consuming. I
like the Duration but I don’t like the lack of raceway options.


William Miller
Miller Solar.com
805-438-5600
www.millersolar.com


On Thu, Oct 2, 2025 at 1:58 PM Jason Szumlanski via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> For batteries like the Midnite PowerFlo16 or EG4 Wallmount using a NEC
> Chapter 3 wiring method, what do you do in regards to running an EGC with
> the DC circuit conductors in a raceway? Midnite, for example, supplies a
> #10 EGC to bond the case of the battery, but this is not suitable for a
> circuit with an ampacity of 210A per NEC Table 250.122. It's not addressed
> in manuals from these manufacturers.
>
> It would be easy enough to run a #4 copper EGC with the 2/0 battery
> cables, but where would you terminate it at the battery end? The case
> ground screws are far too small. I suppose you could use a grounding
> bushing if the raceway is not itself qualified as the EGC. In cases where
> you have a conduit box like EG4 or if you set a Midnite AIO on a wiring
> trough, they supply plastic bushings to use, so there is no solid
> electrical continuity between the inverter and wiring trough, yet you
> seemingly need to run up to a #4 EGC through the opening with the battery
> cables. Where would that terminate in the trough or on the battery?
>
> I haven't had any issues with AHJs by just running a #10 with the circuit
> conductors and making sure all metallic parts are bonded, but something
> doesn't seem right about all of this, and I want to be prepared if called
> out by an inspector.
>
> Jason Szumlanski
> Florida Solar Design Group
>
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