I think the answer is in 250.28(D)(2). A bonding jumper is required in each service disconnect (including the solar disconnect) bonding neutral to ground.
Then you have to look to 250.64(D) for how to run your GEC. There are multiple ways to comply. Consider 250.64(D)(3): Think of a wiring enclosure with service laterals that has a bus bar for neutral (as in multiple service disconnects for a property, regardless of whether solar is present). Each service disconnect neutral connects to the bus bar, but there is no GEC from each disconnect to the grounding electrode. There is a single point on the bus bar in the service lateral enclosure where the GEC connects and is routed to the grounding electrode system. Each service disconnect requires a bonding jumper from neutral to ground. But in that case you do not need to run a GEC from each service disconnect bus bar to the service lateral bus bar. You only run the GEC from a single disconnect or a single point on the common bus bar in the service lateral enclosure. The neutral provides the EGC function/pathway for each service disconnect. It might seem a little strange to NOT run a EGC to each service disconnect, but that's the way I read it. So the single common point of connection of the GEC can be in the existing service disconnect and no GEC is required at all from the solar disconnect. The bonding jumper is required to be installed in the solar disconnect. But 250.64(D)(1) is the way we do it. Every jurisdiction around here requires that a neutral and a ground (GEC) be run to each service disconnect, including the solar disconnect and that the bonding jumper be installed in the solar disconnect. Another way I have seen it done that I DO NOT believe complies is to simply pass through the solar neutral in the solar disconnect without landing it there and just land it in the existing main service panel. On Tue, Jul 23, 2019 at 4:39 PM Rick Brown < [email protected]> wrote: > Al, > See 250.2: > “Bonding Jumper, Supply-Side. A conductor installed on the supply side of > a service or within a service equipment enclosure(s), or for a separately > derived system, that ensures the required electrical conductivity between > metal.” > > rick brown > SolShine Energy Alternatives, LLC > Electrical & Solar Contracting Services > www.SolShineEnergyAlternatives.com > Check, Virginia 24072 > 540.808.9502 > > VA Class A Contractor Lic# 2705147660 > VA Master Electrician Lic# 2710062762 > VA Alternative Energy Systems Installer > NABCEP Certified PV Installation Professional 110112-21 > > On Jul 23, 2019, at 9:38 AM, Al Frishman <[email protected]> wrote: > > Hey Wrenchers, > I have been having a design debate with several associates regarding > bonding the Neutral to the Ground for Line Side grid connections. > > In the fused solar AC Disconnect located closest to the Service Line Side > grid connection should the Neutral be bonded to Ground? What Article in > the NEC defines the requirement. > > As always your feedback is appreciated. > > *Al Frishman* > EvolvedSolar > (917) 699-6641 > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > >
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