Engineering Data for Copper and Aluminum Conductor Electrical Cables

Transcription

1 2018 Edition Engineering Data for Copper and Aluminum Conductor Electrical Cables THE OKONITE COMPANY Okonite Cables...A higher Standard!

2 The Okonite Company, 2018

3 Okonite Cables Table of Contents SECTION 1 General Conductor Information 1-8 Stranding 1-2 dc Resistance 3-4 ac/dc Ratios 5-7 Physical & Mechanical Properties 8 SECTION 2 General Information 9-11 Motor Currents 9-10 Systems Diagrams 10 Voltage Rating 11 Electrical Formulas 11 SECTION 3 Voltage Regulation SECTION 4 Short Circuit Currents Conductor Currents 14 Shielding Currents 15 SECTION 5 Shielding Discussion Induced Voltage, Current, and loss, Formulas 19 Example Problems 20 SECTION 6 - Ampacity Tables Discussion and Correction Factors 21 Tables Single Conductors Underground ducts Underground Direct Burial In Air 34 In Conduit 37 Triplexed Conductors Underground Ducts Underground Direct Burial In Air 35 In Conduit 37 Three Conductor Underground Ducts Underground Direct Burial In Air 36 In Conduit 38 N.E.C. Code Table 38 SECTION 7 Installation Practices Conduit Sizes Maximum Pulling Tensions 40 Example Problems 41 Minimum Bending Radii 42 Installation Procedures Borehole Cables (Safety Factor) 46 Sag and Tension Calculations SECTION 8 High Voltage Proof Testing High Voltage dc Field Testing 52 dc Field Acceptance Testing 52 Test Limitations 52 Test Notes 53 Maintenance Proof Testing 53 Frequency of Tests 53 SECTION 9 Miscellaneous Information Formulas for Calculating Charging Current 54 Capacitance of Cables 54 Insulation Resistance 54 Jacket Materials Selection Chart 55 Decimal Equivalents & Temperature Conversion Table 56 Equivalents of Sq. MM. 57 Sq. In. and Circular Mils Reel Capacities Reusable Reels 58 Reusable Reels 59-60

4 Okonite Cables List of Tables Page SECTION 1 General Conductor Information TABLE 1-1 Compact and Compressed Diameters 1 TABLE 1-1 Solid and Concentric Stranding 1 TABLE 1-2 Flexible Stranding 2 TABLE 1-3 Resistance in Ohms per 1000 feet per Conductor at 20 C and 25 C of solid wire and Class B Concentric Strands Copper and Aluminum Conductors 3 TABLE 1-4 Copper and Aluminum Resistance-Temperature Correction Factors 4 TABLE 1-5 AC/DC Resistance Ratios - for Copper and Aluminum Conductors, 60 Hertz (65 C) 5 TABLE 1-6 Conductor Resistance and Ampacities at High Frequencies 6 TABLE 1-7 Copper Conductor Resistance and Ampacities at High Frequencies 7 TABLE 1-8 Physical & Mechanical Properties of Conductor Materials 8 TABLE 1-9 Breaking Strength - Bare Copper and Aluminum Wire 8 SECTION 2 General Information TABLE 2-1 Full-Load Currents of Motors in Amperes 9 TABLE 2-2 Full-Load Currents of Motors in Amperes 10 TABLE 2-3 Electrical Formulas for Determining Amperes, Horsepower, Kilowatts and Kilovolt-Amperes 11 SECTION 3 Voltage Regulation TABLE 3-1 Reactance of Conductors at 60Hz 13 SECTION 4 Short Circuit Currents TABLE 4-1 TABLE 4-2 SECTION 5 Shielding TABLE 5-1 Allowable Short Circuit Currents of Insulated Copper and Aluminum Conductors 14 Permissible Short Circuit Currents for Copper Shielding Tape-Amperes 15 Operating Voltage Limits, kv, above which Insulation Shielding is required 16 TABLE 5-2 Maximum Lengths for Single Conductor Cables with Shields 18 TABLE 5-3 Formulas for Calculating Shield Voltages-Currents and Losses for Single-Conductor Cables 19 SECTION 6 Ampacity Tables TABLE 6-1 Correction Factors for Various Ambient Air Temperatures 21 TABLE 6-2 Correction Factors for Various Ambient Earth temperatures 21 TABLE 6-3 Group Correction Factors - Cables in Air 21 TABLE 6-4 Group Correction Factors - Conduits in Air 21 TABLE 6-5 Single Conductor Cable Underground Ducts - One Circuit, Three Cables in Separate Ducts 22 TABLE 6-6 Single Conductor Cable Underground Ducts - Two Circuits, Six Cables in Separate Ducts 23 TABLE 6-7 Single Conductor Cable Underground Ducts - Three Circuits, Nine Cables in Separate Ducts 23 TABLE 6-8 Single Conductor Cable Direct Burial - One Circuit, Three Cables 24 TABLE 6-9 Single Conductor Cable Direct Burial - Two Circuits, Six Cables 25 TABLE 6-10 Triplexed Cable Underground Ducts - One Circuit, Three Single or Triplexed Conductors per Duct 26 TABLE 6-11 Triplexed Cable Underground Ducts - Three Circuits, Three Single or Triplexed Conductors per Duct 27 TABLE 6-12 Triplexed Cable Underground Ducts - Six Circuits, Three Single or Triplexed Conductors per Duct 27

5 Okonite Cables List of Tables Page TABLE 6-13 Triplexed Cable Direct Burial - One Circuit 29 TABLE 6-14 Triplexed Cable Direct Burial - Two Circuits 29 TABLE 6-15 Three Conductor Cable Underground Ducts - One Circuit, One Cable in Duct Bank 30 TABLE 6-16 Three Conductor Cable Underground Ducts - Three Circuits, Three Cables in Duct Bank 31 TABLE 6-17 Three Conductor Cable Underground Ducts - Six Circuits, Six Cables in Duct Bank 31 TABLE 6-18 Three Conductor Cable Direct Burial - One Circuit, One Cable 33 TABLE 6-19 Three Conductor Cable Direct Burial - Two Circuits, Two Cables 33 TABLE 6-20 Single Conductor Cable in Air 34 TABLE 6-21 Three Single Conductor Cables in Air 35 TABLE 6-22 Three Conductor Cable in Air 36 TABLE 6-23 Three Single Conductor Cables in Conduit - in Air 37 TABLE 6-24 Three Conductor Cable - Conduit in Air - One Isolated Cable 38 TABLE 6-25 NEC Code Installations Ampacity at 75 C Conductor Temperature 30 C Ambient 38 SECTION 7 Installation Practices TABLE 7-1 Dimensions of Conduit 39 TABLE 7-2 Percent Internal Area of Conduit or Tubing 39 TABLE 7-3 Percent Internal Diameter of Conduit or Tubing 39 TABLE 7-4 Maximum Allowable Diameter (in Inches) of Individual Cables in Given Size of Conduit 39 TABLE 7-5 Values of e fa 40 TABLE 7-6 Minimum Bending Radii - Power Cables without Metallic Shielding or Armor 42 TABLE 7-7A Minimum Bending Radii - Twisted Pair Instrumentation Cable 42 TABLE 7-7 TABLE 7-8 Minimum Bending Radii - Power Cables with Metallic Shielding or Armor 42 Minimum Bending Radii - Rubber Jacketed Flexible Portable Power and Control Cables used on Take-up Reels and Sheaves 42 TABLE 7-9 Galvanized Steel Wire - Tensile Strength - Weight - Diameters 46 TABLE 7-10 Sag Messenger Characteristics 47 TABLE 7-11 Sag Tables 49 TABLE 7-12 Sag Calculating Charts 50 TABLE 7-13 Sag Calculating Charts 51 SECTION 8 High Voltage Proof Testing TABLE 8-1 High Voltage Field Acceptance Test 52 TABLE 8-2 High Voltage Maintenance Test 53 TABLE 8-3 Frequency of Proof Testing 53 SECTION 9 Miscellaneous Information TABLE 9-1 Jacket Materials Selection Chart 55 TABLE 9-2 Decimal Equivalents of One Inch 56 TABLE 9-3 Temperature Conversion Table 56 TABLE 9-4 Equivalents of Sq. mm, Sq. in. and Circular Mils 57 TABLE 9-5 Capacity of Reusable Reels, Feet 58 TABLE 9-6 Dimensions and Capacities of Reusable Reels for Wires and Cables 59-60

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14 Motor Currents

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16 Electrical Formulas

17 Voltage Regulation

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21 Shielding

22 Shielding

23 Shielding

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25 Shielding

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27 Ampacity Tablets CONCRETE DUCT SINGLE CONDUCTOR CABLE

28 Ampacity Tablets

29 Ampacity Tablets 36 EARTH PROTECTIVE BARRIER SAND 7 ½

30 Ampacity Tablets EARTH PROTECTIVE BARRIER SAND 36 7 ½ 24

31 Ampacity Tablets EARTH CONCRETE DUCT TRIPLEXED CABLE

32 Ampacity Tablets

33 Ampacity Tablets EARTH 36 PROTECTIVE BARRIER SAND 24

34 Ampacity Tablets

35 Ampacity Tablets EARTH DUCT TREE CONDUCTOR CABLE

36 Ampacity Tablets

37 Ampacity Tablets EARTH PROTECTIVE BARRIER 36 SAND 24

38 Ampacity Tablets

39 Ampacity Tablets MESSENGER WALL SINGLE CONDUCTOR CABLE

40 Ampacity Tablets MESSENGER THREE SINGLE CONDUCTOR CABLES

41 Ampacity Tablets MESSENGER THREE CONDUCTOR CABLES

42 Ampacity Tablets SUPPORT STRUCTURE THREE SINGLE CONDUCTOR CABLES

43 Ampacity Tablets SUPPORT STRUCTURE CONDUIT THREE CONDUCTOR CABLE

44 Methods for Determining Conduit Sizes

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47 Minimum Bending Radii

48 Procedures

49 Procedures 24 MINIMUM BACK-FILL 6 TO 8 PRELIMINARY COVERING OF SAND OR STONE FREE EARTH 3 TO 4 SOFT BEDDING OF SAND OR STONE FREE EARTH

50 Procedures

51 Procedures

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53 Procedures

54 Procedures

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59 Miscellaneous Information

60 Miscellaneous Information

61 Miscellaneous Information

62 Miscellaneous Information

63 Miscellaneous Information

64 Miscellaneous Information

65 Miscellaneous Information