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Wiring Color Codes - University of Illinois Extension

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Wiring Color
Codes
for McLean County 4-H Projects
Common colors for DC wire
Black
White
Red
DC Battery Connections
Black wire always to
negative terminal
White wire always to
positive terminal
DC Connections
Black wires
identify negative or
hot wires. Switches
connect on negative
side of battery to
the load (light).
White wire is used
to identify the
positive polarity.
Switch
White
Black
Black
Black
This Knife switch shows black wire in and
black wire out.
This type of miniature lamp socket has a
brass colored screw and a silver screw.
Black wires will connect to brass and
white wires connect to silver.
Red wire is also like
black and can be
used to identify the
negative side or
switch side of a
circuit.
This is a 3-way circuit. Red and black
wires are used to identify the path of
current and are on the negative side.
White
Black
Black
3-way switch
Black
Red
This is a 3-way/4-way circuit. Red and
black wires are used to identify the path of
current and are on the negative side.
The lights are in series. The black wire in
between the lights could also be red.
Black
4-way switch
Common Wire for AC
Type 1
Ground
Romex Cable
2 conductor
with a ground
Black
White
Common Wire for AC
Type 2
Black
Ground
Romex Cable
3 conductor
with a ground
White
Red
AC Connections
Wiring an Outlet
Ground
green
terminal
White
silver
terminal
(neutral)
Black
(hot)
Outlet other side:
Black wire on brass
terminal (hot)
AC Connections
Wiring a Switch
Neutrals tied
together
Black (hot)
Black (hot)
Ground green
terminal
AC Connections Wiring
a 3-way switch
Wiring of a 3-way switch using 3
conductor Romex cable. This is an
exception where white can is
terminated on the switch and is a
HOT (live) wire!
A closer look a the 3way switch. Notice the
dark screw, that is the
common position.
The other side of the
3-way switch.
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