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The new standard colour code does not use red. Where new wiring is mixed with old, cables must be clearly marked to prevent interchange of phase and neutral. Variation in the earth/ground conductor's colour at an earlier date than the remainder of the colours means its colour should not be used as an indication of the old vs new standard cable ...
The term plug is in general and technical use in all forms of English, common alternatives being power plug, [3] electric plug, [4] and plug top. [5] The normal technical term for an AC power socket is socket-outlet , [ 6 ] but in non-technical common use a number of other terms are used.
During the first 50 years of commercial use of electric power, standards developed rapidly based on growing experience. Technical, safety, and economic factors influenced the development of all wiring devices and numerous varieties were invented. After the two-prong electric plug was introduced in the 1920s, the three-pin outlet was developed.
The cable core colours are described in IEC 60304 (1982-01), Standard colours for insulation for low- frequency cables and wires. The three-phase phase colours are brown, black and grey instead of red, yellow and blue. Where a circuit includes a neutral or mid-point conductor identified by colour, the colour used shall be blue.
The first rubber-insulated cables for US building wiring were introduced in 1922 with US patent 1458803, Burley, Harry & Rooney, Henry, "Insulated electric wire", issued 1923-06-12, assigned to Boston Insulated Wire and Cable . These were two or more solid copper electrical wires with rubber insulation, plus woven cotton cloth over each ...
Note that the wires in the 6-wire cable are coloured with two colours in a ratio of four to one in length, with the first colour mentioned being the predominant one, e.g. if the indicated colour of the wire is W-B then the wire will be coloured white for 12 mm, then blue for 3 mm and so on.
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Two Israeli plugs and one socket. The left plug is the old standard; the one on the right is the 1989 revision. Israeli socket polarity, with wire colour coding. The plug defined in SI 32 is used only in Israel, the Gaza Strip and the West Bank. There are two versions: an older one with flat pins, and a newer one with round pins. [38]