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[5]: 27 For an arbitrary gauge n, it's approximately 10 n/10 Ω per 10 000 ft. Because aluminum wire has a conductivity of approximately 61% of copper, an aluminum wire has nearly the same resistance as a copper wire that is two sizes smaller, which has 62.9% of the area.
The 250-foot (76 m) cutters' weights were used for estimating purposes. Tapered bulkhead stiffeners cut from 12" I-beams went from the main deck (4' depth of web) to the bottom (8" depth of web). As weight was cut out of the hull structure, electronics and ordnance were increased, but at much greater heights.
This was the standard light freight locomotive of the USRA types, and was of 2-8-2 wheel arrangement in the Whyte notation, or 1′D1′ in UIC classification. A USRA Light Mikado type locomotive donated to the National Museum of Transportation by the Chicago and Illinois Midland Railway
Second, they received 24 units of 2-8-2T from Hanomag and Werkspoor later classified as SS Class 1400 in 1921-22 which were the tank version of the 2-8-0 SS Class 900 (DKA D50). [34] The SS Class 1400 initially was intended to be heavyweight shunter , [ 35 ] but due to Great Depression , the SS had to preserve some of their large locomotives.
An extended specification, THWN-2 permits use in wet locations and conductor temperatures up to 90°C simultaneously. [ 18 ] There are additional restrictions on such wire's use not mentioned here (for example, neither THHN nor THWN may be exposed to sunlight, or directly buried in the ground [ 20 ] ); see the NEC for details.
The first 8000 series electric conductor alloy, still widely used in some applications, was developed and patented in 1972 by Aluminum Company of America . [8] This alloy, along with AA-8030 (patented by Olin in 1973) and AA-8176 (patented by Southwire in 1975 and 1980), performs mechanically like copper.