Ok, this might not be 100% power and grounding but they protect power cables and sit on the ground:
What cable covers / cable channels do you like? How much of your cable runs do you cover?
I've got a pile (read: a pallet... 150' total, 51-3' units, plus a 4-way cross that I rarely use and some 45° turns that also get rarely used...silly me, buying things I may not really need... oh well.) of Checkers 5-channel cable ramps. I went 5-channel to be compatible with the "big guys" in town, who use Checkers Guard Dog/Yellow Jacket (so they are interchangeable) for their production.
I usually will cover FOH run, more often then not on my dime. [I'd like to be charging for these more then I do, as I have $8,000 invested in them, but for some of my smaller events, they just don't have the budget to add even a couple hundred more bucks to the invoice.] I'm also ready to cover things like power-cables-going-across-the-backstage-access-point. Basically, the more publicly visible and accessible the cables area, the more inclined I am to ramp them.