I don't know for sure, but I think the deal is that you can't have outlets
and junction boxes that are not accessible -- such as in a wall or ceiling
behind sheetrock, etc. But, if it is accessible -- meaning there is an
access panel that can be easily opened to get to the outlet or junction box,
or in this case, a dropped ceiling panel that can be opened or moved -- it
is okay.

So, I think that yes, you can do what you want to do.

T. McQuinn wrote:
I realize that local codes can vary, but I'm wondering if this is ever
allowed. I have an application where I need to power 2 alarm
transformers. They are 'bricks' that convert to 12 volts and have a
screw that permanently attaches them to an outlet (a long screw that
replace the short one used to hold the outlet cover on). 12 volts
comes out of them. There would be no 120v cords above the drop
ceiling, only low voltage. So in this scenario would I be so in
violation of the NEC if I put an outlet above the drop ceiling? I
won't bother chasing down the local code if this is an outrageous
idea.
Tom