I should have said it’s the wire for the ground rod.
Our 12k generator connects to the house with a 50 amp plug.
Sorry, this is a bit of a complicated area.
(I'm not a licensed electrician, but I do wrangle cattle, I.e. no electrical certification whatsoever.)
1) is your generator internally neutral to ground bonded?
2) does your plug go to a transfer switch, or a breaker interlock?
3) If the plug does go to a transfer switch, does the transfer switch
a) switch the 2 hots, or
b) does it switch the 2 hots and the neutral?
4) is the ground rod specific to the generator?
5) is your 12kW double insulated?
The general practice is for portable generators not to be neutral to ground bonded when attached to homes, but neutral to ground bonded otherwise. This is a bit of a tug of war between OSHA, the NEC, and local AHJs, so
your mileage will vary.
A portable generator will generally rely on the wiring of the generator cable, plug and transfer switch to the home ground for grounding. Some folks are uncomfortable with that, and drive a separate ground for the generator, and some inspectors are unhappy with that as well.
I would point you to the NEC code for grounding portable generators, and check out Mike Holt's detailed website and forums, e.g,
and local codes, e.g.
Portable Generator Bonding And Grounding: NEC SDS Vs. Non-SDS Rules Made Simple
When reading the NEC, it often discusses the "grounded-conductor", which usually means a current carrying conductor connected to earth, I.e. "neutral", not to be confused with a ground wire, which is not intended to routinely carry currents.
(E.g. this, where the terms are defined at the end of the blog)
Published by Joe Doughney and Lilly Vang, Consulting-Specifying Engineer, Electrical Articles: Electrical grounding and bonding per NEC, December 9, 2020. Understanding correct grounding and bondin…
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Grounding seems simple, but in my experience it is often not.
I hope that this helps. I personally would not use a DINSE connector on a ground wire as in the event of failure my life might depend on the ground wire being well connected, and I personally can foresee ways that a connector might become loose. I bolt mine. That is not a recommendation.
All the best,
Peter