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For power circuits, the color-coding uses the same colors as residential construction, and adds the additional wires used for three-phase systems. Black, Red and Blue are used for hot wires and White is used as the neutral wire in a 120/208 V circuit. Brown, Orange and Yellow are used as hot wires and gray is used as the neutral wire in a 277/ ...
The pattern then starts over with the first 25-pair group as white/blue, and continues indefinitely, in multiples of 600 pairs or parts thereof. For example, a 900-pair cable has the first 600 pairs in 24 groups of 25 pairs in a white binder, and the remaining 300 pairs in 12 groups of 25 pairs wrapped in a red binder. [5] [6]
The three conductors are usually coloured red, black, and white. The white serves as a common neutral, while the red and black each feed, separately, the top and bottom hot sides of the receptacle. Typically such receptacles are supplied from two circuit breakers in which the handles of two poles are tied together for a common trip.
A mnemonic which includes color name(s) generally reduces the chances of confusing black and brown. Some mnemonics that are easy to remember: Big Boys Race Our Young Girls But Violet Generally Wins. Better Be Right Or Your Great Big Venture Goes West. [1] Beetle Bailey Runs Over Your General Before Very Good Witnesses.
Two conductors are sheathed in red and black rubber, and the central earth wire is bare. These cables are dangerous because the sheath is prone to split if repeatedly flexed. In the United Kingdom, an early form of insulated cable, [ 9 ] introduced in 1896, consisted of two impregnated-paper-insulated conductors in an overall lead sheath.
Three-phase colours changed to red, white and blue; black for neutral or earth. Revised in 1943; reprint with minor amendments in 1945; supplement issued in 1946; revision to section 8 in 1948. 1950 12th IEE Three-phase colours of red white and blue; black for neutral or earth in fixed wiring; green earth in flex. Supplement issued 1954.
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