I posted a question on the DIY SE site, and it was recommended that maybe a part of it would be better asked here.
Consider these two outlets:
The blue WR logo indicates that the outlet is "weather-resistant"; it has design features intended to keep water, dust, dirt, etc out of its inner workings. Current electrical code requires outlets in any outdoor areas to be WR-rated, and they're a good idea for "wet" indoor areas like kitchens, bathrooms etc. as well.
Notice the first picture has the plug in what most U.S. residents would call "right-side-up" orientation; the blades are above the ground pin and it looks like a face. However, the blue WR logo is upside-down when you look at it this way.
The second picture has the plug "upside-down" compared to our normal sensibilities; the ground pin is on top of the "live" blade slots. The blue WR logo also happens to be right-side up in this orientation. From an engineering perspective, this may provide additional shock safety by presenting the ground pin first to any water that falls onto the outlet; the question of just how big a deal a WR outlet's orientation is is the remaining subject of the related question on the DIY site.
The question for the UX gurus is, does the orientation of the logo appear deliberate?
That is, are the manufacturers, by placing the logo the way they did, trying to tell you that the outlet should be installed "upside-down", thus orienting the logo properly? And a related question would follow: Does this seem an effective way to indicate proper orientation, or would a more explicit "this side up" be a better way to approach it?
EDIT: Benny had a great idea, which works for certain outlet designs. However, there are also outlets like this:
which use and thus expose the space between outlets, and so something different would be needed here. However, the metal chassis that screws into the wall is NOT replaceable without replacing the entire plug (all these plugs are designed not to be disassembled; they're weather-resistant after all and so have a seal preventing water leaking in), and that has been used in the past for various warnings.