I have a situation where a EGC will not fit on the neutral bar in the service equipment. I have tried to find a listed and same manufacturer add-on grounding lug kit to no avail.Except for the article 110 listing requirement issue is there anything wrong with installing a bolt-on lug of proper size and bolting it to the side of the panel with a nut and bolt? Code references please. Thanks
What size ECG is this? Many panels over the last ten years or so will accept #14 -#4 in every hole. The hole might look too small, but break out the inspection mirror and look real close, or look at the label for the ratings. You might be surpized to find it might fit. If not you can bolt just about any add-on lug, or bar, in the method John described for EGC.
Mark Heller "Well - I oughta....." -Jackie Gleason
I would drill and tap a hole in the panel and mount a lug. As long as the neutral is bonded to the enclosure properly it should be sufficient. Don't listen to sanding the paint off the panel. This is not required and in fact in itself a violation of the code.
When was the last time you read 300.6 Protection from Corrosion, or the other articles that require that paint protecting the enclosure. Possibly you require the removal of the Neutral bus and the paint sanded off although the UL listing and the code approves bonding through a screw and a tapped hole as long as it is not a sheet metal screw.
In my opinion all of you are flirting with disaster.
Most panels are not made of cans with thick enough metal to take the required two full threads when tapped.
Removing the paint to attach a lug is dangerous for the stated reason, and, the unreliablity of field installed lugs. (What nationally recognized testing labroratory has tested these connections and has detailed the steps to follow?)
The only grounding connections I would approve are the neutral or ground bus, the supplemental grounding bus kit (installed in the pre-formed holes, using the included self-tapping screws) or a grounding bushing.