Epson FX-870 User Manual page 9

The green and yellow wire must be connected to the terminal in the
plug which is marked with the letter E or with the earth symbol (&)
or coloured green or green and yellow.
The blue wire must be connected to the terminal in the plug marked
with the letter N or coloured black.
The brown wire must be connected to the terminal in the plug
marked with the letter L or coloured red.
If damage occurs to the plug, replace the cord set or consult a
qualified electrician.
Replace fuses only with a fuse of the correct size and rating.