METHOD 1 - This color code system employs six (6) different base colors alternating through a series of 21 conductors.

In this series, the last 15 conductors are marked with tracers of contrasting colors. The color sequence is repeated in regular sequence as necessary for cable configurations employing more than twenty-one (21) conductors.

CONDUCTOR NO. BASE COLOR TRACER COLOR
1 Black n/a
2 White n/a
3 Red n/a
4 Green n/a
5 Orange n/a
6 Blue n/a
7 White Black
8 Red Black
9 Green Black
10 Orange Black
11 Blue Black
12 Black White
13 Red White
14 Green White
15 Blue White
16 Black Red
17 White Red
18 Orange Red
19 Blue Red
20 Red Green
21 Orange Green