Brother 1870N - HL B/W Laser Printer Manual De L'utilisateur page 200

The colours of the wiring in the power lead of this printer may not
correspond with the markings which identify the terminals in your plug. If you
need to fit a different plug, proceed as follows.
Remove a length of the cord outer sheath, taking care not to damage the
coloured insulation of the wires inside.
Cut each of the three wires to the appropriate length. If the construction of
the plug permits, leave the green and yellow wire longer than the others so
that, in the event that the cord is pulled out of the plug, the green and yellow
wire will be the last to disconnect.
Remove a short section of the coloured insulation to expose the wires.
The wire which is coloured green and yellow must be connected to the
terminal in the plug which is marked with the letter "E" or by the earth symbol
or coloured green or green and yellow.
The wire which is coloured blue must be connected to the terminal which is
marked with the letter "N" or coloured black or blue.
The wire which is coloured brown must be connected to the terminal which
is marked with the letter "L" or coloured red or brown.
The outer sheath of the cord must be secured inside the plug. The coloured
wires should not hang out of the plug.
A–30