02,
See item 12 in
post number 1, for a pic..
It appears to me the power supply is water resistant, but I doubt it is water proof...
I doubt a rain shower will cause any issues, but I used to live in Florida, and we had plenty of rain that came down in bucket loads...
My power supply is outside, but under the roof eve, so it might get a little wet, but it is not exposed to massive amounts of water..
I just think it would be a good idea that if the power supply were left out in the open, that it would be better off with some kind of protection.