On Wed, 28 Nov 2018 16:41:57 -0500, micky
wrote:

In alt.home.repair, on Wed, 28 Nov 2018 10:21:13 -0800, Oren
wrote:

On Wed, 28 Nov 2018 12:57:41 -0500, wrote:

When I see one opposite of the rest, I assume it is on a switch.

+1

I have several outlets with pin up. They are switched for table lamps.
One side is hot and the other switched. Often marked by an adhesive
dot sticker.

I like that system, half hot, half switched.

I asked the electrician to put the switched half pin up and the hot half
pin down, but he refused. I had to hire another electrician.
If youlook at an duplex outlet you will see it is impossible to
install the switched side different than the unswitched side - - -