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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.
Australia was linked to British telegraph cables directly in 1871, by extending a line from Singapore to Port Darwin, although it ran through the Dutch territory of Java. [4] By 1872, messages could be sent direct from London to Adelaide and Sydney. Australia was linked to New Zealand by cable in 1876. [a]
Australia and New Zealand [b] Italy [17] Prohibited: [c] [18] AS/NZS 3000:2018. Australia and New Zealand [b] Installation wiring: (section 3.8.1) recommended for single phase [d] recommended for multiphase While light blue is prohibited from use for active function, dark blue is recommended for L3. usually used for "Switched Line" [19]
In Australia and New Zealand, the colour of the external sheath is usually white for flat TPS or orange for circular TPS but several other colours are available. Wire sizes of 1–6 mm 2 cross-sectional area (CSA) are available with the outer sheath covering the cores.
'Twin and Earth' electrical cable to British Standard 6004, with twin 6 mm² conductors and uninsulated 2.5 mm² earth continuity conductor. Twin and earth (often written "T&E" and sometimes "T and E") cable is a colloquial name in the UK, Australia, New Zealand and other countries for a type of flat sheathed fixed mains electricity cable, containing two insulated current-carrying conductors ...
Electrical wiring is an electrical installation of cabling and associated devices such as switches, distribution boards, sockets, and light fittings in a structure. Wiring is subject to safety standards for design and installation.
The international standard IEC 60446 Basic and safety principles for man-machine interface, marking and identification - Identification of equipment terminals, conductor terminations and conductors was a standard published by the International Electrotechnical Commission (IEC) that defined basic safety principles for identifying electrical conductors by colours or numerals, for example in ...
Compared to modern electrical wiring standards, these are the main technical shortcomings of knob-and-tube wiring methods: never included a safety grounding conductor did not confine switching to the hot conductor (the so-called Carter system prohibited as of 1923 places electrical loads across the common terminals of a three-way switch pair)