grounding for seperately derived system.

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andyrq1

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Hi,
I have a job where we need to ground three trailer hitched generators. Each generator will feed a power distribution center for band equipment and lighting.
We live up in the mountains in Colorado and driving a ground rod this time of year isn't fun at all.
I'm wondering if it's possible to ground the generators off of a nearby barn's grounding electrode. Just looking at the definition of Seperately Derived System leads me to think that I can't.
Another question that I have, if I have to drive ground rods, do all three generators need their own grounding electrodes or can I put them all together?

Any thoughts would be greatly appreciated.

Andy
 
250.34 seems to apply to Receptacles that are mounted on the Generator itself. What if there is an output Breaker and the Feeder is run to a Remote Panel. Then I would think that Grounding would Apply. Is that correct.
 
Thanks Chris. Looking at 250.34 portable generators aren't required to be connected to a grounding electrode system provided that it is supplying power to "cord and plug connected equipment through receptacles mounted on the generator".
I didn't mention it in my previous post, but the generators are 175 kva and I'll be installing the feeders to the distribution panel on feed through lugs in the generator. I interpret this as meaning I'll need a grounding electrode since I wont be using the receptacles on the generator.
 
Thanks jap,
That's right. I'm using the feed through lugs on the generator so I assume I'll need to ground the generator.
 
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