Engineering:20-pair colour code (Australia)

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

• www.commsalliance.com.au [1]

See also

• 25-pair colour code