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The 1965 edition of the NEC, article 384-15 was the first reference to the circuit total limitation of panelboards. [1] As of 2008, the location of this language is at Article 408.54 now titled "Maximum Number of Overcurrent Devices."
American Association of State Highway and Transportation Officials (AASHTO) recommends having minimum curb-to-curb clearance for two-lane highways of 24 feet (7.3 m) and wall-to-wall clearance of 30 feet (9.1 m), while desired curb-to-curb clearance should be 39 feet (12 m), and wall-to-wall clearance should be 44 feet (13 m). [22]
Square D is an American manufacturer of electrical equipment headquartered in Andover, Massachusetts. Square D is a flagship brand of Schneider Electric , which acquired the company in 1991. The company was listed on the New York Stock Exchange for 55 years prior to its acquisition without reporting financial loss in any calendar quarter ...
Engineering fits are generally used as part of geometric dimensioning and tolerancing when a part or assembly is designed. In engineering terms, the "fit" is the clearance between two mating parts, and the size of this clearance determines whether the parts can, at one end of the spectrum, move or rotate independently from each other or, at the other end, are temporarily or permanently joined.
In civil engineering, clearance refers to the difference between the loading gauge and the structure gauge in the case of railroad cars or trams, or the difference between the size of any vehicle and the width/height of doors, the width/height of an overpass or the diameter of a tunnel as well as the air draft under a bridge, the width of a ...
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