[RE-wrenches] N-G bond for supply side connection Midnite Power

[Jason Szumlanski]

I agree. It is not a separate service. It is a "tap" of the existing
service (I use that term loosely here). The additional service disconnect
for the supply side interconnection should have L1, L2, and N
connected ahead of the premises main disconnect with no EGC. There should
be a N-G bonding jumper in the PV service disconnect. Then there should be
no N-G bonds downstream of both the premises main disconnect and the PV
service disconnect.

Basically, it's the same as two main disconnects running from a meter
enclosure. Each of the service disconnects has a N-G bond required.

Some AHJs (the crazy ones) require an EGC between the enclosure where the
supply side connection is made and the PV service disconnect. This creates
a parallel fault path, and should not be allowed, in my humble opinion.

Now it sounds like you might be doing a partial home backup. The issue
there is that sometimes the loads or enclosures you moved over the backup
load panel have inadvertent N-G bonds. Sometimes it's as simple as someone
who got creative and used a ground as a neutral in a switch box. I say
simple, but that can be hard to track down.

When Midnite said to remove it from the inverter distribution panel, they
were probably talking about the protected loads panel.

I think more information is needed.



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 Thu, Oct 23, 2025 at 11:03 AM Tyrone Houck via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> My interpretation, and the way it was explained to me by both Ryan
> Mayfield and Kyle Bolger(several years ago at this point, popular opinion
> may have changed since). Is that it is not a seperate service.
>  It is however required to have a ground-neutral bond( though in my
> opinion pointless and redundant as there is a bond in the enclosure where
> the tap is made). If it gives you any issue, ensure as close to equal
> potential to the grounding electrode as possible(and make sure your neutral
> is appropriately sized). I personally don't see the point but it is an NEC
> requirement
>
>
>
>
> On Thu, Oct 23, 2025, 6:08 AM Dave Tedeyan via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> Hi All,
>>
>> For years I have understood that when doing a supply side connection, you
>> are supposed to bond the neutral to ground in the solar service disconnect.
>> I have a Midnite AIO system with two inverters (set up as a supply side
>> connection) that recently was getting a CA-DC link Overvoltage error. When
>> talking to Midnite, their first response was to make sure that there was
>> only one N-G bond in the whole system. When I mentioned that the solar is a
>> separate service and thus there is a N-G bond in both the main panel and
>> the inverter distribution panel, they said to remove it from the inverter
>> distribution panel. I want to make the system work right, but I also am
>> hesitant to do something against how I have understood the NEC to be for a
>> long time. I am curious if you all have thoughts on this or run into a
>> similar situation.
>>
>> Cheers,
>> Dave
>>
>> --
>>
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