I just purchased a 3600 watt portable generator to power miscellaneous construction tools at job sites without electrical power. The generator manufacturer requires the unit be properly grounded ( 5/8" grounding rod, driven 8' into the earth and attached to the unit's frame with #8 solid bonding wire). I have been told this is not necessary for the type of equipment I will be powering (circular saws, table saws, miter saws, compressors, etc.) I know of several contractors who routinely use portable generators without grounding them. I would like to get some qualified professional advice about this.