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The resistance of copper wire is approximately 1 Ω / 1000 ft for 10 AWG, 10 Ω / 1000 ft for 20 AWG, 100 Ω / 1000 ft for 30 AWG, and so on. [ 5 ] : 27 For an arbitrary gauge n , it's approximately 10 n /10 Ω per 10 000 ft .
A standard wire gauge. The British Standard Wire Gauge, often referred to as the Standard Wire Gauge or simply SWG, is a unit used to denote wire gauge (size) as defined by BS 3737:1964, a standard that has since been withdrawn. It is also known as the Imperial Wire Gauge or British Standard Gauge. Although its use has significantly declined ...
In both those instances the white wire should be identified as being hot, usually with black tape inside junction boxes. The neutral wire is identified by gray or white insulated wire, perhaps using stripes or markings. With lamp cord wire the ribbed wire is the neutral, and the smooth wire is the hot. NEC 2008 400.22(f) allows surface marking ...
The wire is not round but has grooves at the sides to allow the hangers to attach to it. Sizes were (in cross-sectional area) 85, 100, or 150 mm 2. To make the wire stronger, 0.04% tin might be added. The wire must resist the heat generated by arcing and thus such wires should never be spliced by thermal means.
Conventional 2-wire or 3-wire distribution lines have a higher power transfer capacity, but can require 7 poles per kilometre (12 poles per mile), with spans of 100 to 150 metres (110 to 160 yards). SWER's high line voltage and low current also permits the use of low-cost galvanized steel wire (historically, No. 8 fence wire). [9]
The TGV catenary is strung in 1,200 m (3,900 ft) sections and mechanically tensioned by a system of pulleys and counterweights. The masts are spaced at 54 m (177 ft) apart. The messenger wire is bronze with a circular cross-section of 65 mm 2 (0.101 in 2). The contact wire is copper with a cross-section of 150 mm 2 (0.23 in 2).
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