It looks like there is a bonding screw just below where the bare equipment grounding conductor lands? That bonds that grounding lugs set to the panel enclosure. You can always do a continuity test from point to point to determine if they are bonded.
Michael D Nelson MD Electric & Solar, Inc. 707-684-0064 mobile 707-884-1862 office www.mdelectricsolar.com www.facebook.com/mdelectricandsolar > On Dec 29, 2016, at 3:31 PM, August Goers <aug...@luminalt.com> wrote: > > Hi Rebekah, > > If in doubt, it won’t hurt to run a bonding jumper from the neutral block to > the new ground bar. Check out NEC 250.92 if you haven’t already. > > That neutral block you show in your picture clearly has an insulating gasket > behind it and it is really hard to tell if the screw is intended to ground it > to the can or not. > > We have to do a bonkers amount of grounding here in San Francisco so have > become very familiar with all the little ins and outs of grounding (at least > how San Francisco wants it). I like the Soares Book of Grounding as a visual > backup to the NEC: > > https://www.amazon.com/Soares-Book-Grounding-Bonding-2014-NEC/dp/1890659657 > > Cheers, > > August > > From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On > Behalf Of Rebekah Hren > Sent: Thursday, December 29, 2016 2:40 PM > To: RE-wrenches > Subject: [RE-wrenches] Grounding/bonding question for 200A main breaker > service disconnect > > Hi Wrenches, > Is anyone familiar with the type of main disconnect shown in this picture? I > need to figure out if the GEC is bonded to the box or not. A supply side > connection has been made in the box, and the only grounding for the PV system > is via the green EGC on the new terminal strip. I am inspecting this as a > third party, and did not perform the installation. > > I cannot tell if the GEC (the bare copper) is bonded to the box via the > (apparently) isolated terminal where the neutral and main panel EGC (the bare > aluminum) are landed. > > The green wire on the grounding terminal at the bottom left is the EGC > running to the supply-side connected PV system AC fused disconnect, but the > PV system will not actually be grounded (um, at all) unless the GEC is bonded > to the box through that black plastic neutral block, which appears to be > isolated with cardboard. There is no other connection to physical earth > except the bare copper GEC. > > Checked with the meter and got continuity from the green to bare wire, but > that could be because the bare aluminum EGC is touching the box in multiple > places. > > It may be that the GEC is bonded via a back-mounted screw to the box, but I > just can't tell what's going on with this design or what is supposed to be > happening. That tab to the right of the bare copper GEC does not actually > touch the terminal above it as you can see from the second picture, unless it > is a connection in the plastic. > > <image002.jpg>. > > <image004.png> > > Thanks for any insight! > > > > Rebekah > > -- > Tel: 336.266.8800 > NABCEP Certified Solar PV Installation Professional™ 091209-85 > NC Licensed Electrical Contractor > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/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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