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05551
THEOKONITECOMPANY
THEOKONITECOMPANY
Engineering Data for Copper andAluminum Conductor Electrical Cables
102 Hilltop Road, Ramsey, NJ 07446 201.825.0300 Fax: 201.825.9026 www.okonite.com
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Okonite Cables...A higher Standard!
2018 Edition
The Okonite Company, 2018
SECTION 1General Conductor Information 1 - 8
Stranding 1 - 2dc Resistance 3 - 4ac/dc Ratios 5 - 7Physical & Mechanical Properties 8
SECTION 2 General Information 9 - 11Motor Currents 9 - 10Systems Diagrams 10Voltage Rating 11Electrical Formulas 11
SECTION 3 Voltage Regulation 12 - 12
SECTION 4 Short Circuit Currents 14 - 15Conductor Currents 14Shielding Currents 15
SECTION 5 Shielding 16 - 20Discussion 16 - 18Induced Voltage, Current, and loss,Formulas 19Example Problems 20
SECTION 6 - Ampacity Tables 21 - 38Discussion and Correction Factors 21Tables 22-38
Single ConductorsUnderground ducts 22 - 23Underground Direct Burial 24 - 25In Air 34In Conduit 37
Triplexed ConductorsUnderground Ducts 26 - 27Underground Direct Burial 28 - 29In Air 35In Conduit 37
Three ConductorUnderground Ducts 30 - 31Underground Direct Burial 32 - 33In Air 36In Conduit 38
N.E.C. Code Table 38
SECTION 7 Installation Practices 39 - 51Conduit Sizes 39 - 40Maximum Pulling Tensions 40Example Problems 41Minimum Bending Radii 42Installation Procedures 43 - 45Borehole Cables (Safety Factor) 46Sag and Tension Calculations 47 - 51
SECTION 8High Voltage Proof Testing 52 - 53
High Voltage dc Field Testing 52dc Field Acceptance Testing 52Test Limitations 52Test Notes 53Maintenance Proof Testing 53Frequency of Tests 53
SECTION 9Miscellaneous Information 54 - 60
Formulas for CalculatingCharging Current 54Capacitance of Cables 54Insulation Resistance 54
Jacket Materials Selection Chart 55Decimal Equivalents & Temperature
Conversion Table 56Equivalents of Sq. MM. 57
Sq. In. and Circular MilsReel Capacities
Reusable Reels 58Reusable Reels 59 - 60
Table of Contents
Okonite Cables
Page
SECTION 1 General Conductor InformationTABLE 1 - 1 Compact and Compressed Diameters 1TABLE 1 - 1 Solid and Concentric Stranding 1TABLE 1 - 2 Flexible Stranding 2TABLE 1 - 3 Resistance in Ohms per 1000 feet per Conductor at 20C
and 25C of solid wire and Class B Concentric Strands Copperand Aluminum Conductors 3
TABLE 1 - 4 Copper and Aluminum Resistance-Temperature Correction Factors 4TABLE 1 - 5 AC/DC Resistance Ratios - for Copper and Aluminum Conductors,
60 Hertz (65C) 5TABLE 1 - 6 Conductor Resistance and Ampacities at High Frequencies 6TABLE 1 - 7 Copper Conductor Resistance and Ampacities at High Frequencies 7TABLE 1 - 8 Physical & Mechanical Properties of Conductor Materials 8TABLE 1 - 9 Breaking Strength - Bare Copper and Aluminum Wire 8SECTION 2 General InformationTABLE 2 - 1 Full-Load Currents of Motors in Amperes 9TABLE 2 - 2 Full-Load Currents of Motors in Amperes 10TABLE 2 - 3 Electrical Formulas for Determining Amperes, Horsepower,
Kilowatts and Kilovolt-Amperes 11SECTION 3 Voltage RegulationTABLE 3 - 1 Reactance of Conductors at 60Hz 13SECTION 4 Short Circuit CurrentsTABLE 4 - 1 Allowable Short Circuit Currents of Insulated Copper and
Aluminum Conductors 14TABLE 4 - 2 Permissible Short Circuit Currents for Copper Shielding
Tape-Amperes 15SECTION 5 ShieldingTABLE 5 - 1 Operating Voltage Limits, kV, above which Insulation Shielding
is required 16TABLE 5 - 2 Maximum Lengths for Single Conductor Cables with Shields 18TABLE 5 - 3 Formulas for Calculating Shield Voltages-Currents and Losses for
Single-Conductor Cables 19SECTION 6 Ampacity TablesTABLE 6 - 1 Correction Factors for Various Ambient Air Temperatures 21TABLE 6 - 2 Correction Factors for Various Ambient Earth temperatures 21TABLE 6 - 3 Group Correction Factors - Cables in Air 21TABLE 6 - 4 Group Correction Factors - Conduits in Air 21TABLE 6 - 5 Single Conductor Cable Underground Ducts - One Circuit, Three Cables
in Separate Ducts 22TABLE 6 - 6 Single Conductor Cable Underground Ducts - Two Circuits, Six Cables
in Separate Ducts 23TABLE 6 - 7 Single Conductor Cable Underground Ducts - Three Circuits, Nine
Cables in Separate Ducts 23TABLE 6 - 8 Single Conductor Cable Direct Burial - One Circuit, Three Cables 24TABLE 6 - 9 Single Conductor Cable Direct Burial - Two Circuits, Six Cables 25TABLE 6 - 10 Triplexed Cable Underground Ducts - One Circuit, Three Single or
Triplexed Conductors per Duct 26TABLE 6 - 11 Triplexed Cable Underground Ducts - Three Circuits, Three Single
or Triplexed Conductors per Duct 27TABLE 6 - 12 Triplexed Cable Underground Ducts - Six Circuits, Three Single or
Triplexed Conductors per Duct 27
List of Tables
Okonite Cables
Page
TABLE 6 - 13 Triplexed Cable Direct Burial - One Circuit 29TABLE 6 - 14 Triplexed Cable Direct Burial - Two Circuits 29TABLE 6 - 15 Three Conductor Cable Underground Ducts - One Circuit, One Cable
in Duct Bank 30TABLE 6 - 16 Three Conductor Cable Underground Ducts - Three Circuits, Three
Cables in Duct Bank 31TABLE 6 - 17 Three Conductor Cable Underground Ducts - Six Circuits, Six Cables
in Duct Bank 31TABLE 6 - 18 Three Conductor Cable Direct Burial - One Circuit, One Cable 33TABLE 6 - 19 Three Conductor Cable Direct Burial - Two Circuits, Two Cables 33TABLE 6 - 20 Single Conductor Cable in Air 34TABLE 6 - 21 Three Single Conductor Cables in Air 35TABLE 6 - 22 Three Conductor Cable in Air 36TABLE 6 - 23 Three Single Conductor Cables in Conduit - in Air 37TABLE 6 - 24 Three Conductor Cable - Conduit in Air - One Isolated Cable 38TABLE 6 - 25 NEC Code Installations Ampacity at 75C Conductor Temperature
30C Ambient 38SECTION 7 Installation PracticesTABLE 7 - 1 Dimensions of Conduit 39TABLE 7 - 2 Percent Internal Area of Conduit or Tubing 39TABLE 7 - 3 Percent Internal Diameter of Conduit or Tubing 39TABLE 7 - 4 Maximum Allowable Diameter (in Inches) of Individual Cables in
Given Size of Conduit 39TABLE 7 - 5 Values of efa 40TABLE 7 - 6 Minimum Bending Radii - Power Cables without Metallic Shielding
or Armor 42TABLE 7 - 7A Minimum Bending Radii - Twisted Pair Instrumentation Cable 42TABLE 7 - 7 Minimum Bending Radii - Power Cables with Metallic Shielding
or Armor 42TABLE 7 - 8 Minimum Bending Radii - Rubber Jacketed Flexible Portable
Power and Control Cables used on Take-up Reels and Sheaves 42TABLE 7 - 9 Galvanized Steel Wire - Tensile Strength - Weight - Diameters 46TABLE 7 - 10 Sag Messenger Characteristics 47TABLE 7 - 11 Sag Tables 49TABLE 7 - 12 Sag Calculating Charts 50TABLE 7 - 13 Sag Calculating Charts 51SECTION 8 High Voltage Proof TestingTABLE 8 - 1 High Voltage Field Acceptance Test 52TABLE 8 - 2 High Voltage Maintenance Test 53TABLE 8 - 3 Frequency of Proof Testing 53SECTION 9 Miscellaneous InformationTABLE 9 - 1 Jacket Materials Selection Chart 55TABLE 9 - 2 Decimal Equivalents of One Inch 56TABLE 9 - 3 Temperature Conversion Table 56TABLE 9 - 4 Equivalents of Sq. mm, Sq. in. and Circular Mils 57TABLE 9 - 5 Capacity of Reusable Reels, Feet 58TABLE 9 - 6 Dimensions and Capacities of Reusable Reels for Wires and Cables 59-60
List of Tables
Okonite Cables
Motor Currents
Electrical Formulas
Voltage Regulation
Shielding
Shielding
Shielding
Shielding
CONCRETE
DUCT
SINGLECONDUCTOR
CABLE
Ampacity Tablets
Ampacity Tablets
EARTH
PROTECTIVEBARRIER
SAND
7
36
Ampacity Tablets
EARTH
PROTECTIVEBARRIER
SAND
7 24
36
Ampacity Tablets
EARTH
CONCRETE
DUCT
TRIPLEXEDCABLE
Ampacity Tablets
Ampacity Tablets
EARTH
PROTECTIVEBARRIER
SAND
24
36
Ampacity Tablets
Ampacity Tablets
EARTH
TREECONDUCTOR
CABLE
DUCT
Ampacity Tablets
Ampacity Tablets
EARTH
PROTECTIVEBARRIER
SAND 24
36
Ampacity Tablets
Ampacity Tablets
MESSENGER
WALL
SINGLECONDUCTORCABLE
Ampacity Tablets
MESSENGER
THREE SINGLECONDUCTOR CABLES
Ampacity Tablets
THREE CONDUCTOR CABLES
MESSENGER
Ampacity Tablets
SUPPORT STRUCTURE
THREE SINGLECONDUCTORCABLES
Ampacity Tablets
SUPPORT STRUCTURE
CONDUIT
THREE CONDUCTOR CABLE
Ampacity Tablets
Methods for DeterminingConduit Sizes
MinimumBending Radii
Procedures
24MINIMUM
6 TO 8
3 TO 4
BACK-FILL
PRELIMINARYCOVERINGOF SANDOR STONE FREEEARTH
SOFT BEDDINGOF SANDOR STONEFREE EARTH
Procedures
Procedures
Procedures
Procedures
Procedures
MiscellaneousInformation
MiscellaneousInformation
MiscellaneousInformation
MiscellaneousInformation
MiscellaneousInformation
MiscellaneousInformation
MiscellaneousInformation