I have a floor box 28x32x26d in a exibition hall with (6) 20amp duplex recp (1) 100amp 3p4w recp
data outlets 4"drain,air and water line without dividers between compartments.
No. This is commercial and this is not a kitchen. My question is why is all of this in the same box? The thing that concerns me is the water connection. Since this is below the floor there is a possibility this pit could fill with water given that the drain was clogged.
You are just looking to put a band-aid on a problem with something that shouldn't have been done that way in the first place. Would you put these receptacles inside of a bath tub then try to figure a way to make them safe? That's what you are trying to do!
Rather than hope GFI's will work, you need to put your efforts into getting the electrical into a separate area away from the water.