Grounding a portable generator?

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Moderator Post (s) for this thread: > Grounding generators and separately derived systems by Billhart on 01/11/2009 > Grounding Electrodes by Billhart on 01/11/2009 > Not True by homebild on 01/11/2009 > And By the Way by homebild on 01/11/2009 > Required grounding Electrodes by Billhart on 01/11/2009 > I Love it when the big boys go at it!!! by Jasper on 01/13/2009 > Portable or semi-portable generators by Billhart on 01/11/2009 > Ground wire by Billhart on 01/11/2009

I borrowed a portable generator during a recent outage, and simply ran a wire to my furnace circuit to keep the house warm- no ground. Now, I bought my own for the next storm, and the manual refers to grounding the generator. There is a bolt on the generator to attach a ground wire to. I have read a lot of articles that refer to driving a ground rod in the ground. Instead, could I run a wire to the water pipe where it enters my house? It is near where the generator will be. Also- what is the best way to connect a ground wire to the pipe? Just wrap it around the pipe a couple times? Solder? other? Thank you!