Multi-core cables - Colour code for core pairs "8P" 

IC UL/CSA

Core
Pair of wires
Code
1 black - brown bk - bn
2 black -red bk - rd
3 black - orange bk - or
4 black - yellow bk - ye
5 black - green bk - gn
6 black - blue bk - bu
7 black - violet bk - vt
8 black - grey bk - gy
9 black - white bk - wh
10 brown - red bn - rd
11 brown - orange bn - or
12 brown - yellow bn - ye
13 brown - green bn - gn
14 brown - blue bn - bu
15 brown - violet bn - vt
16 brown - grey bn - gy
17 brown - white bn - wh
18 red - orange rd - or
19 red - yellow rd - ye
20 red - green rd - gn
21 red - blue rd - bu
22 red - violet rd - vt
23 red - grey rd - gy
24 red - white rd - wh