As Tyrone says, times may have changed, but I've always approached supply-side connections based on the type of supply I'm connecting to. In Vermont, we see two types of connections. One with four wires between the meter and the main service disconnect (L1, L2, N, G). In this configuration, we do not make a neutral/ground bond at the PV system disconnect because one was made at the meter.
The other is three wires between the meter and main service disconnect (L1, L2, N). In this configuration, we do make a neutral/ground bond at the PV system disconnect. Also, if I recall correctly, the PV system is not considered a second service under the NEC. But smarter people than I may have more up-to-date information. Thanks, Will ________________________________ From: RE-wrenches <[email protected]> on behalf of Tyrone Houck via RE-wrenches <[email protected]> Sent: Thursday, October 23, 2025 11:01 AM To: RE-wrenches <[email protected]> Cc: Tyrone Houck <[email protected]> Subject: [EXTERNAL] Re: [RE-wrenches] N-G bond for supply side connection Midnite Power CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. 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 <[email protected]<mailto:[email protected]>> 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 -- [Logo]<https://urldefense.com/v3/__https://www.sungineersolar.com/__;!!KPww_GFiJXw!cfCkA7tAgtw29oHcZgoFLPG0fYrtoep5hMrKhWU7oKhftyB0eQP_x5leI3wGe5PYBW9joTZSqb8HdY4mSW7c6u6pM7l27rFH$> Dave Tedeyan, P.E. 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