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.

1-2021-4041-6061-8081-100
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 Wire white.svg White Wire blue.svg Blue21 Wire yellow.svg Yellow Wire blue.svg Blue41 Wire black.svg Black Wire blue.svg Blue61 Wire violet.svg Violet Wire blue.svg Blue81 Wire red.svg Red Wire blue.svg Blue
2 Wire orange.svg Orange22 Wire orange.svg Orange42 Wire orange.svg Orange62 Wire orange.svg Orange82 Wire orange.svg Orange
3 Wire green.svg Green23 Wire green.svg Green43 Wire green.svg Green63 Wire green.svg Green83 Wire green.svg Green
4 Wire brown.svg Brown24 Wire brown.svg Brown44 Wire brown.svg Brown64 Wire brown.svg Brown84 Wire brown.svg Brown
5 Wire gray.svg Grey25 Wire gray.svg Grey45 Wire gray.svg Grey65 Wire gray.svg Grey85 Wire gray.svg Grey
6 Wire blue white stripe.svg Blue-White26 Wire blue white stripe.svg Blue-White46 Wire blue white stripe.svg Blue-White66 Wire blue white stripe.svg Blue-White86 Wire blue white stripe.svg Blue-White
7 Wire blue orange stripe.svg Blue-Orange27 Wire blue orange stripe.svg Blue-Orange47 Wire blue orange stripe.svg Blue-Orange67 Wire blue orange stripe.svg Blue-Orange87 Wire blue orange stripe.svg Blue-Orange
8 Wire blue green stripe.svg Blue-Green28 Wire blue green stripe.svg Blue-Green48 Wire blue green stripe.svg Blue-Green68 Wire blue green stripe.svg Blue-Green88 Wire blue green stripe.svg Blue-Green
9 Wire blue brown stripe.svg Blue-Brown29 Wire blue brown stripe.svg Blue-Brown49 Wire blue brown stripe.svg Blue-Brown69 Wire blue brown stripe.svg Blue-Brown89 Wire blue brown stripe.svg Blue-Brown
10 Wire blue gray stripe.svg Blue-Grey30 Wire blue gray stripe.svg Blue-Grey50 Wire blue gray stripe.svg Blue-Grey70 Wire blue gray stripe.svg Blue-Grey90 Wire blue gray stripe.svg Blue-Grey
11 Wire orange white stripe.svg Orange-White31 Wire orange white stripe.svg Orange-White51 Wire orange white stripe.svg Orange-White71 Wire orange white stripe.svg Orange-White91 Wire orange white stripe.svg Orange-White
12 Wire orange green stripe.svg Orange-Green32 Wire orange green stripe.svg Orange-Green52 Wire orange green stripe.svg Orange-Green72 Wire orange green stripe.svg Orange-Green92 Wire orange green stripe.svg Orange-Green
13 Wire orange brown stripe.svg Orange-Brown33 Wire orange brown stripe.svg Orange-Brown53 Wire orange brown stripe.svg Orange-Brown73 Wire orange brown stripe.svg Orange-Brown93 Wire orange brown stripe.svg Orange-Brown
14 Wire orange gray stripe.svg Orange-Grey34 Wire orange gray stripe.svg Orange-Grey54 Wire orange gray stripe.svg Orange-Grey74 Wire orange gray stripe.svg Orange-Grey94 Wire orange gray stripe.svg Orange-Grey
15 Wire green white stripe.svg Green-White35 Wire green white stripe.svg Green-White55 Wire green white stripe.svg Green-White75 Wire green white stripe.svg Green-White95 Wire green white stripe.svg Green-White
16 Wire green brown stripe.svg Green-Brown36 Wire green brown stripe.svg Green-Brown56 Wire green brown stripe.svg Green-Brown76 Wire green brown stripe.svg Green-Brown96 Wire green brown stripe.svg Green-Brown
17 Wire green gray stripe.svg Green-Grey37 Wire green gray stripe.svg Green-Grey57 Wire green gray stripe.svg Green-Grey77 Wire green gray stripe.svg Green-Grey97 Wire green gray stripe.svg Green-Grey
18 Wire brown white stripe.svg Brown-White38 Wire brown white stripe.svg Brown-White58 Wire brown white stripe.svg Brown-White78 Wire brown white stripe.svg Brown-White98 Wire brown white stripe.svg Brown-White
19 Wire brown gray stripe.svg Brown-Grey39 Wire brown gray stripe.svg Brown-Grey59 Wire brown gray stripe.svg Brown-Grey79 Wire brown gray stripe.svg Brown-Grey99 Wire brown gray stripe.svg Brown-Grey
20 Wire gray white stripe.svg Grey-White40 Wire gray white stripe.svg Grey-White60 Wire gray white stripe.svg Grey-White80 Wire gray white stripe.svg Grey-White100 Wire gray white stripe.svg 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".

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