Another poster mentioned that usually the brass screw is for the hot
(black) and the silver screw is for the neutral (white). In addition,
the neutral blade on the plug should be the wider of the two blades if
they are of different widths (they are often the same width). However,
even if the two blades on the plug are the same width, the neutral blade
will be the one that plugs into the widest slot in the socket.
Therefore, the silver screw (neutral = white wire) should connect within
the plug to the widest blade or the blade that plugs into the widest
slot of the socket.

wrote:
I have just purchased a 110V U ground plug end to repair a light (1 K).
The old one did not have a ground so I went to get one that is up to
code. There are three wires - green (ground), black and white (beige).
I am not sure on which side to place the Black and Beige wires - on
the plug it says 'insulated wire here'. But both the black and the
beige are insulated, so I am not sure. Any help would be appreciated .
Thanks