ECN Forum Forums Code Related Discussion NEC & other Code issues Definition of "grade level"?

In 210.8(A)2 it talks about accessory buildings at "grade level" need GFCI protection. Does this mean at "dirt" level? Does it mean if it is on a slab? How about if it is on concrete blocks and a foot above ground? The way it talks is that if it is above the dirt, no matter how much, it don't have to have GFCI protection. I think that might could be a good thing to clarify in the next code myself.
thanks, Steve..

I think if the building is up on a stem wall or on blocks with a crawl, it is not at grade. A slab is grade.

I imagine they are thinking an elevated building would have a wood floor.

Around here you see buildings on a stem wall where they fill the box with dirt and pour a slab. I think I would try to say that was grade level, looking at the intent but I doubt I could survive a challenge.

Greg, how about a slab with plywood nailed to it? That's what one of the buildings I'm about to wire has. The slab is about 6" or 8" thick. I'll probably just go ahead with a GFI but it's interesting to know. Thanks.

I would want to err on the safe side.