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Here's an email we got from one of our Instructors:

 

I just purchased a portable generator from Harbor Freight and was reading my operating guide for the machine.  The instructions said to ground the generator prior to use and this seemed strange to me, since I would be using the 4-prong 240V connector to my house.  I asked an electrician at work, and he recommended that I not add a ground, and to watch your video on grounding.  Very informative video.  As advised by the instructor in the video, you, I am informing you that there is another manufacturer that is recommending grounding their machine.  Attached are the instructions.

Thanks for the education,

Stewart

Mike Holt's Comment: See my Electrical Safety Fundamentals [1hr:13min] video on Grounding.

 

 

 
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Mike Holt Enterprises of Leesburg, Inc. 3604 Parkway Blvd. Suite 3 Leesburg, FL 34748
"... as for me and my house, we will serve the Lord." [Joshua 24:15]
Comments

  • Mike I am puzzled by your comments. To quote you "Separately derived systems (SDSs) include most transformers as well as any generator or UPS supplying a transfer switch that opens the neutral conductor." The NEC answers such questions in 250.30 by providing the requirements for SDSs. It is code, protects the frame of the generator and allows GFCI to operate properly.

    True, the generator driven rod ground does nothing to help fault clearance (except GFCI) if Nuetral and ground to the load are correct. I do like how they specified a 24 inch rod, funny.

    chuck catanese  August 12 2016, 8:44 am EDT
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