Download e-book for iPad: American Electricians' Handbook by Terrell Croft, Clifford C. Carr

By Terrell Croft, Clifford C. Carr

ISBN-10: 0071377352

ISBN-13: 9780071377355

This bestselling reference has been the undisputed average in its box considering that 1913. each component of the guide has been completely up to date with such vital revisions as up-to-date codes, advances in strong kingdom know-how, new info on vehicles, and lately built instruments, apparatus, and different items on hand from brands.

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Additional info for American Electricians' Handbook

Example text

Areas in square mils are obtained by multiplying the length and breadth of the rectangle expressed in thousandths of an inch. Thus, the area of a rectangle 1⁄2 in wide and 2 in long would be 500 ϫ 2000 ϭ 1 million mils2. In actual area, a circular mil is about 8⁄10 as great as a square mil. 93. To reduce square mils or square inches to circular mils, or the reverse, apply one of the following formulas. 0000007854 EXAMPLE (21) The sectional area of the busbar in Fig. 0000007854 ϭ 955,000 cmil EXAMPLE The sectional area of the steel T shown in Fig.

B. iron wire. . . . . . . . . . . . . . . . . Platinum (pure). . . . . . . . . . . . . . . . . . . . B. iron wire Nickel. . . . . . . . . . . . . . . . . . . . . . . . Tin (pure) . . . . . . . . . . . . . . . . . . . . . . Steel (wire) . . . . . . . . . . . . . . . . . . . . . Substance Brass . . . . . . . . . . . . . . . . . . . . . . .

136). Apparent power is the term applied to the product of voltage and current in an ac circuit. It is expressed in voltamperes (VA) or in kilovolt-amperes (kVA) or megavolt-amperes (MVA). 135. Power factor is the ratio of the true power or watts to the apparent power or voltamperes. The power factor is expressed as a decimal or in percentage. 8 and of 80 percent are the same. In giving the power factor of a circuit, state whether it is leading or lagging. The current is always taken with respect to the voltage.

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American Electricians' Handbook by Terrell Croft, Clifford C. Carr

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