By William A. Thue
This paintings offers insurance of the layout, manufacture, install, trying out, operation and function expectancies of electric energy cables used wordwide, concentrating on low- and medium-voltage cables. The paintings discusses: simple dielectric idea; conductors; cable features; electric homes of insulating fabrics; defensive energy cables; sheaths, jackets and armours; criteria and requirements; splicing and terminating; ampacity; treeing; lightning safeguard; corrosion; and extra.
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Extra resources for Electrical Power Cable Engineering: Second: Edition,
4. , New York, NY, AEIC, 1994. [4-21 Association of Edison Illuminating Companies, Specgcations for Ethylene Propylene Insulated Shielded Power Cables Rated 5 Through 69 k [ Specification CS6-96,6th Ed. New York, NY, AEIC, 1996. Copyright © 1999 by Marcel Dekker, Inc. 58 CHAPTER 5 INSULATING MATERIALS FOR CABLES Bruce S. 0 INTRODUCTION Electrical insulation materials are employed over the metallic conductors of underground cables at all voltage ratings. Polymeric materials are employed as the insulation, but the nature of the polymer may vary with the voltage class.
The abbreviation used in the past for thousand circular mils was MCM. The SI abbreviations for million, M, and for coulombs, C, is easily confused with the older term. 3 Metric Designations All the world, except for North America, uses the SI unit of square millimeters (mm2)to designate conductor size. The International Electrotechnical Commission has adopted IEC 280 to define these sizes. An important consideration is that these are not precise sizes. For instance, their 50 mm2 conductor is actually 47 mm’.
1 1) XL = Ohms per 1000 feet S = Distance from the center of the cable conductor to the center of the neutral r = Radius of the center conductor S and r must be expressed in the same unit, such as inches. The inductance of a multi-conductor cable mainly depends on the thickness of the insulation over the conductor. 1 Cable Inductive Reactance at Higher Frequencies. Since the inductive reactance of an insulated conductor is directly proportional to frequency, the inductive reactance is substantially increased in higher frequency applications.