1) "The generator is a portable (on wheels) 10Kw generator with a 3 prong 6-50R plug that has a 250v 42 amp breaker. I would like to keep it considered as a "Seperately derived Source" but my 4 wire suggestion may change the classification."
If its a "Seperately Derived Source" then its just like the Seperately Derived Utility Transformer. Unless you ONLY use plug and cord connected equipment to onboard receptaces IT REQUIRES A GROUNDING ELECTRODE just like at the Utility Transformer where the Neutral GrounDED Conductor has a No 4 copper wire ran down the pole to a Grounding Electrode (Earth ground Rod). Therefore for use as a Seperately Derived Source, the Neutral is bonded to the frame/case which is also bonded to a suitable Grounding Electrode (like a driven rod i.e. whats called a a Made Electrode.)
2) "The generator has a second 4 pole twist lock plug with a 250v 30 amp breaker"
Its my best "guess" those 4 poles are Neutral, Ground, two Hots I've seen small cheap gensets where the Neutral to case frame connection is made inside the outlet receptacle! Not sure not being there how that outlet is configured, sorry
3) "I can skip the ground as the generator and main panel connect the G + N --- or --- connect the G + N in the cord connection from the generator to the house creating a total 3 G + N connections."
Im not sure I'm following what you mean, but heres what is needed if you use a Two Pole (NOT switched Neutral) Transfer Switch and do NOT use the Genset as a Seperately Derived Source"
a) At the genset DO NOT HAVE THE NEUTRAL BONDED TO THE CASE/FRAME (disconnect it if its that way now),,,,,,,b) Run 4 wires to the Transfer Switch (2 Hots, Neutral, Ground),,,,,c) The Utility and Gensets Neutrals are bonded together (often inside Transfer Switch but NOT also bonded to case/frame of switch),,,,,,,d) Run an Equipment GroundING Conductor from the main panels Ground Buss out to the case/frame of the genset and also the transfer switches case frame in order that all non current carrying metallic enclosures or motor or genny frames etc be connected to the equipment GroundING Conductor)
4) "I would assume this is not compliant with the NEC The 4 wire work around"
If you do it as I described above I believe IT IS INDEED NEC COMPLIANT. It takes 4 wires,,,,No Neutral to case frame bond on genset,,,,,,Case frame of genset is bonded to equipment GroundiNG Conductor ran out from main panel,,,,,,Two Pole (NON switched Neutral) Transfer Switch,,,,,Utility and Genset Neutrals tied together
5) "Can I use the 2 hot + N from the plug and then connect the 4th (ground) wire to the frame of the generator (intended to be used for a ground rod) and be compliant with the NEC. This would keep the G and N seperate as the NEC wants. BUT is their something else in the NEC that prohibits this?"
I am too lazy to look that up but DO NOT LIKE THE SOUND OF IT I always routed all the conductors, including GroundING Conductor, in the SAME raceway or enclosure or cord or conduit etc. Thats a question one of the currently practicing professional electricians (NOT untrained Billy Bob) might answer better then me, it just been too long since I retired, sorry, but you have the 4 wires part CORRECT, I'm just leary of the Equipment GroundING Conductor being all alone and speperate lol but hey it may be okay IM JUST UNSURE
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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