To ground a generator or not to ground a generator. That is the question

[focalpoint11]

can someone answer a question about grounding generators that has been concerning me for a while now. I've looked into the code book, I have paid for mikes system online (all the videos and books I purchased) Ive watched his YouTube videos including MikeHolt.com/aux. Maybe I'm just slow, but I have the determination. I can't figure out a couple things, using a portable generator with a transfer switch that is (separate from generator) that switches the neutral (separately derived system) can I run a grounding electrode conductor from the generator frame lug to the existing main electrical service grounding system (ground rod) and if not, why? And also why does the code say (if I'm reading it right) you do not drive a ground rod to ground the generator and you use the existing grounding system (ground rod) for a non separately derived system(no neutral switching). Also, what is the purpose or difference of using a system that doesn't switch the neutral and a system (transfer switch) that does switch the neutral or a non separately derived system or separately derived system. Can you please give me some help. Thank you

 

[augie47]

As to the system being a separately derived or not, that determination is made as to the neutral being switched by the transfer switch or not.
(Switched neutral = SDS, solid , non-switched neutral = not a SDS)
(Non SDS is far more common on lower amperage systems)
As to grounding, see 250.34 for details.

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