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20-pair colour code (Australia)

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The 20-pair colour code is a colour code used in Australia to identify individual conductors in a kind of electrical telecommunication wiring for indoor use, known as twisted pair cables. The colours are applied to the insulation that covers each conductor. The first colour is chosen from one group of five colours.

The combinations are also shown in the table below showing the colour for each wire ("1" and "2") and the pair number.

1-20 21-40 41-60 61-80 81-100
Pair # First wire/ A Leg (L+) Second wire/ B Leg (L−) Pair # First wire/ A Leg (L+) Second wire/ B Leg (L−) Pair # First wire/ A Leg (L+) Second wire/ B Leg (L−) Pair # First wire/ A Leg (L+) Second wire/ B Leg (L−) Pair # First wire/ A Leg (L+) Second wire/ B Leg (L−)
1 White Blue 21 Yellow Blue 41 Black Blue 61 Violet Blue 81 Red Blue
2 Orange 22 Orange 42 Orange 62 Orange 82 Orange
3 Green 23 Green 43 Green 63 Green 83 Green
4 Brown 24 Brown 44 Brown 64 Brown 84 Brown
5 Grey 25 Grey 45 Grey 65 Grey 85 Grey
6 Blue-White 26 Blue-White 46 Blue-White 66 Blue-White 86 Blue-White
7 Blue-Orange 27 Blue-Orange 47 Blue-Orange 67 Blue-Orange 87 Blue-Orange
8 Blue-Green 28 Blue-Green 48 Blue-Green 68 Blue-Green 88 Blue-Green
9 Blue-Brown 29 Blue-Brown 49 Blue-Brown 69 Blue-Brown 89 Blue-Brown
10 Blue-Grey 30 Blue-Grey 50 Blue-Grey 70 Blue-Grey 90 Blue-Grey
11 Orange-White 31 Orange-White 51 Orange-White 71 Orange-White 91 Orange-White
12 Orange-Green 32 Orange-Green 52 Orange-Green 72 Orange-Green 92 Orange-Green
13 Orange-Brown 33 Orange-Brown 53 Orange-Brown 73 Orange-Brown 93 Orange-Brown
14 Orange-Grey 34 Orange-Grey 54 Orange-Grey 74 Orange-Grey 94 Orange-Grey
15 Green-White 35 Green-White 55 Green-White 75 Green-White 95 Green-White
16 Green-Brown 36 Green-Brown 56 Green-Brown 76 Green-Brown 96 Green-Brown
17 Green-Grey 37 Green-Grey 57 Green-Grey 77 Green-Grey 97 Green-Grey
18 Brown-White 38 Brown-White 58 Brown-White 78 Brown-White 98 Brown-White
19 Brown-Grey 39 Brown-Grey 59 Brown-Grey 79 Brown-Grey 99 Brown-Grey
20 Grey-White 40 Grey-White 60 Grey-White 80 Grey-White 100 Grey-White

The Australian standard specifies "Grey" in Tables B2 to B7. There are systems in other countries where "Slate" is used rather than "Grey". This is perceived as a minimisation of confusion between "Green" and "Grey" and their potential abbreviations: "G", "Gr", or "Gre". No such consideration is made for "Black", "Blue", or "Brown", or their potential abbreviations of "B", "Bl", or "Br".

Sources

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  • www.commsalliance.com.au [1]

See also

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