ECN Forum Forums General Topics of the Trade General Discussion Area Receptacle in drop ceiling?

I cut a piece of 3/8 plywood to the size of the ceiling tile. I put it right on top of the ceiling tile and use a 1" plaster ring on a 4" box supported by a Caddy 512. The plywood lends weight and stiffness to the whole thing. Keep in mind that ceiling plugs usually get 1 item plugged in and it stays there. They are rarely used as true convenience receps.