I just bought a 4400/3500 watt generator for a building project. The directions say that I need to ground the generator with a suitable grounding rod and stranded No. 12 AWG wire. I have never heard of contractors grounding their generators. Are they being careless, or are my generator instructions overly cautious (like when they tell you not to stand on the open oven door!)?

tkrussell

Thats correct, most people do not properly ground their portable generators as per code and manufacture's instructions.

Of course, because of product liability, manufacturer's will tend be cautious, in the event that someone gets hurt, and there is an injury, they will be off the hook if the unit is not grounded per their instructions and per code.

When we do events such as festivals, outdoor shows , etc. we must always ground all the portable gensets brought in for the event. If you go to a carnival, take a look at the generaotrs , and you will see them grounded to rods.

Chances of something happening while you are using a small genset is unlikely, but you assume all risk.

H. Bunch

Well, I sure do appreciate your input! It is good to know the facts.

So, do you drive in 8'copper or brass rods to ground them? Would a shorter rod do? Also, doesn't the generator ground itself as its metal body touches ground?

tkrussell

Purchase an 8 foot ground rod, it is made witha copper tube with soft white metal inside. I do not se brass rods made any longer.

Code requires a full eight foot, so as to achieve a max of 25 ohms.

No, just because the unit sits on the ground does not mean it is properly grounded properly, plus considering the unit is painted and usually has rubber feet.