NEMA Standards PublicationNo. WC 5-1992
ICEA Publication No. S-61-402
Revision No. 2, December, 1996
THERMOPLASTIC-INSULATED WIRE AND CABLE FOR THE
TRANSMISSION AND DISTRIBUTIONOF ELECTRICAL ENERGY
Prepared and Sponsored by:
Insulated Cable Engineers Association, Inc.
P.O.Box 440
South Yarmouth, MA 02664
Approved and Published by:
National Electrical Manufacturers Association
1300 North 17th Street
Rosslyn, VA 22209
O Copyright 1998 by the National Electncal Manufacturers Association and the Insulated Cable
Engineers Association. All rights including translation into other languages,resewed under the
Universal Copyright Convention, the Berne Convention forthe Protection of Literary and Artistic
Works, and the International and Pan American Copyright Conventions.
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
NEMA STANDARDS PUBLICATIONS NO.WC 5-1992/ICEA S-61402
THERMOPLASTIC-INSULATED WIRE AND CABLE FOR
THE TRANSMISSION AND DISTRIBUTION
OF ELECTRICAL ENERGY
Revision No. 1, December 7 , 1993
Approved by:
Insulated Cable Engineers Association
Box 440
South Yarmouth, MA 02664
Published by:
National Electrical ManufacturersAssociation
21O1 L Street, N.W., Suite 300
Washington, DC 20037
O 1994 by the National Electrical Manufacturers Association
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
-
NEMA WC*5
92 U bq702Ll7 0508702 3 T 8
tting Standards for Excellence
TO: All holders of W C 5-1992
FROM: NEMA Communications Director
RE: Revision 1 to W C 5-1992
DATE: 11 October, 1994
Enclosed please find revision1 to W C 5-1992 The old pages inyour W C 5 should be removed
and replaced with the corresponding pages included here
to bring your standard up to date.A
new title page hasalso been included, reflectingyour standard's updated status. A list of effective
up to date versionof every page inthe
pages has been includedfor reference as to the most
standard. Each page that contains a change has the notation "Revision
1" at the top of the page.
National Electrical
A lanufacturers
Association
,J00
North 17th Street, Suite 1847
Rosslyn, VA 22209
(703)84 1 -3200
FAX (703)
841-3300
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
"
"
"
"
NEMA WC*5 92 H 64702470502734
464
STANDARDS PUBLICATION NO.WC 5
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
ICEA Sb1 4 0 2
NEMA WC 5-1992, Revision 1
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NEMA WC 5.1992. Revision 1
Page i
ICEA S-61402
Table of Contents
Foreword
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .v
Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Part 1
Part 2
Part 3
GENERAL
GeneralInformation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Information to be Supplied by Purchaser . . . . . . . . . . . . . . . . . . . . . . . . . . .
Characteristics of System on Which Cable
is to be Used . . . . . . . . . . . . . . . . . .
Quantities andDescription of Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . .
coNDucToR!3
Physical and Electrical Properties . . . . . . . . . . . . . . . . . . . . . . . . . . .
Copperwires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Aluminurnwires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SolidConductors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
StrandedConductors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Conductor Size. Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Conductor dc Resistance per Unit Length . . . . . . . . . . . . . . . . . . . . . . . . .
Calculation of dc Resistance Per Unit Length . . . . . . . . . . . . . . . . . . . . . . .
ConductorDiameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stress ControlLayer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INSULATION
Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
InsulationThickness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Insulation Thicknesses for Submarine! Power Cables
Insulation Thicknesses for Series Lighting Circuits. . . . . . . . . . . . . . . . . . . . . .
Repairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Insulation ?Lpes and Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Insulation Resistance Constants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Polyvinyl-Chloride60'C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PhysicalandAgingRequirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ElectricalRequirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AcceleratedWater Absorption Requirements . . . . . . . . . . . . . . . . . . . . . . . .
Polyvinyl-Chloride75'C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PhysicalandAgingRequirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ElectricalRequirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accelerated Water Absorption Requirements . . . . . . . . . . . . . . . . . . . . . . . .
PolyethyleneInsulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PhysicalandAgingRequirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ElectricalRequirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wires.
.....................
Polyvinyl-ChlorideØNylon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.............................
...................................
Part 4
vi
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1
3
3
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4
4
4
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5
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11
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12
12
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12
12
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13
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13
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14
14
14
14
PhysicalandAgingRequirements
ElectricalRequirements
Accelerated Water Absorption Requirements . . . . . . . . . . . . . . . . . . . . . . . .
SHIELDING AND COVERINGS SHIELDING
Shielding of Insulated Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21
InsulationShieldSystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21
Multiple-ConductorCables
21
ConductorIdentification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21
Shielding Limits for Power Cable for Fixed
Locations . . . . . . . . . . . . . . . . . . . .
21
Single-Conductor Series Lighting Cable . . . . . . . . . . . . . . . . . . . . . . . . . .
21
Multiple-Conductor Series Lighting Cable . . . . . . . . . . . . . . . . . . . . . . . . . 21
Jackets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23
ThermoplasticJackets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23
Jacket Thickness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24
SeparatorUnderJacket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24
.................................
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
NEMA WC 5.1992. Revision 1
ICEA S-61-402
Page ii
Irregularity Inspectionof Jackets over Metallic Shielded Power Cable
24
Metallic and Associated Coverings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26
..........
General
Part 5
Part 6
...........................................
.....................
.
x
Metallic
Associated
and Coverings
Insulated
forCables-Division
I . . . . . . . . . . . . 27
Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27
Metallicsheath . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27
ProtectiveJackets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
28
Flat MetalTapeArmor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
28
Interlocked Metal Tape Armor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
29
Continuously Corrugated Metal Armor. . . . . . . . . . . . . . . . . . . . . . . . . . .
30
Galvanized SteelWire Armor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31
Jute Bedding for Armored Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
32
Jute Serving Overall for Armored Cable . . . . . . . . . . . . . . . . . . . . . . . . . .
32
Jute for Interlocked Armored Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
33
Core Covering for Nonsheathed and NonjacketedCable
with Metallic Armor . . . . . . 33
Core Covering for Jacketed Cable UnderArmor . . . . . . . . . . . . . . . . . . . . . .
33
Thermoplastic Jacket over Metallic Sheath. . . . . . . . . . . . . . . . . . . . . . . . .
33
Thermoplastic Jacket Over MetallicArmor . . . . . . . . . . . . . . . . . . . . . . . . .
34
Round W
i
r
e Armor for Borehole. Dredge.Shaft. and Vertical Riser Cable-Division II . . 35
scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
35
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
35
Borehole Cable (Suspended atOne End Only) . . . . . . . . . . . . . . . . . . . . . . .
35
DredgeCable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
35
Shaftcable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
36
Vertical Riser Cable (Suspended at One End Only) . . . . . . . . . . . . . . . . . . . .
36
Wire-bandserving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
36
Round Wire Armor for Buried Cable-Division III . . . . . . . . . . . . . . . . . . . .
36
Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
36
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
37
Armor Wire and Jute Servings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
37
ASSEMBLY. FILLERS.AND CONDUCTOR IDENTIFICATION
Assembly of Multiple-Conductor Cables . . . . . . . . . . . . . . . . . . . . . . . . . . .
39
Multiple-ConductorRoundCables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
39
Flat Twin Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
39
Fillers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
39
Conductor Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
39
PowerCables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
39
TESTING AND TEST " H O D S
Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
41
Tests on Samples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
41
Conductor Test Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
41
Method for DC Resistance Determination . . . . . . . . . . . . . . . . . . . . . . . . .
41
Methods for Cross-SectionalArea Determination
43
MethodsforDiameterDetennination
. . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Tests Samples and Specimens for Physical and Aging
Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
43
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
43
Number of Thickness Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . .
43
Measurement of Thickness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
43
Sampling of Insulation for Physical and Aging Tests . . . . . . . . . . . . . . . . . . . .
43
Sampling of Jacket for Physical and Aging Tests
......................
43
NumberofTest Specimens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
44
SizeofSpecimens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
44
Preparation of Specimens of Insulation and Jacket . . . . . . . . . . . . . . . . . . . . .
45
Specimen for Accelerated Aging Test. . . . . . . . . . . . . . . . . . . . . . . . . . . .
45
Calculation of Area ofTestSpecimens
. . . . . . . . . . . . . . . . . . . . . . . . . . . 45
PhysicalTest Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
45
AgingTest . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
46
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
ICEA S-61-402
NEMA WC 5.1992. Revision 1
Page iii
Heatshock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
46
HeatDistortion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
47
ColdBend
48
WrapTest . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
FlameTest . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
49
Physical Tests for Semiconducting Material Intendedfor Extrusion . . . . . . . . . . . . . 49
TestSample . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
49
TestSpecimens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
49
Elon gation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
49
BrittlenessTest . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
49
Accelerated Water Absorption Tests
50
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
50
50
ElectricalMethod (EM-60) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(R~inded5-12-1982) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
50
Dielectric Strength Retention . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
50
Thickness of Coverings
50
NonmetallicTape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
50
Metallic Shielding Tape or Steel Tape . . . . . . . . . . . . . . . . . . . . . . . . . . . .
50
MetallicSheaths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
50
Jute Beddings and Servings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
51 .
AdditionalTests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
51
51
EnvironmentalCracking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Absorption Coefficient Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
51
Tests for Discharge-resisting Jackets . . . . . . . . . . . . . . . . . . . . . . . . . . . .
51
VolumeResistivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
52
Retests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
52
Physical and Aging Roperties and Insulation and Jacket Thicknesses. . . . . . . . . . . 52
Properties
Tests on Samples. Except Physical and Aging
and Insulation and Jacket Thicknesses
53
Electrical Tests on Completed Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
53
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tests
......
Voltage
53
Cables Without
Metallic
Sheath.
Metallic
Shield.
or Metallic Armor
54
Cables With Metallic Sheath. Metallic Shield.or Metallic Armor . . . . . . . . . . . . . 54
Voltage Tests After Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
54
Insulation Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
55
TestApparatus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
55
55
Test Pmxdure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Determination of TemperatureComtion Factors for InsularionResistance . . . . . . . 55
PartialDischargeTest Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
55
Method for Flexibility Test for Continuously CorrugatedArmor . . . . . . . . . . . . . . . 56
CONSTRUCTIONS OF SPECIFIC TYPES
PoleandBracketCable
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
57
Sc0pe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Conductors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
57
Insulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
57
57
Conductor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Belt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
57
Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
58
58
OutsideDiameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bending Radlus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
58
Terminations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
58
ControlCables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
58
Concentric Neutral Underground Residential Distribution
CablesPolyethylene Insulated . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
58
..........................................
..............................
....................................
..........................
...........
Part 7
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
NEMA WC 5.1992. Revision 1
Page ¡v
Part 8
ICEA S-61-402
Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
58
Central Conductor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
58
Insulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
58
Insulation Shieldingand Protective Covering . . . . . . . . . . . . . . . . . . . . . . . .
58
59
ConcentricConductor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Jackets Applied OverA Concentric Conductor . . . . . . . . . . . . . . . . . . 59
Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
60
APPENDICES
Appendix A-Abbreviations and Symbols
. . . . . . . . . . . . . . . . . . . . . . . . . . 65
Appendix &Representative Tensile Strength and
Elongation of Nonmagnetic Metals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
66
Appendix C-Definitions for Maximum Temperature
of Conductors in Insulated Wm and Cable . . . . . . . . . . . . . . . . . . . . . . . . . .
67
Appendix &Emergency Overload Ratings for Thennoplastic-Insulated Cables . . . . . . 68
Appendix &Referenced Publications and Standards . . . . . . . . . . . . . . . . . . . .
69
ICEA Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
69
ASTMStandards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
69
NEMA Standards Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
70
Appendix F-Ampacities for Two-Conductor Concentric-Neutral Single-Phase
Primary Underground Residential Distribution Cables(SeePart 7) . . . . . . . . 71
72
Appendix GShielding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Definition of Shielding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
72
FunctionsofShielding
...................................
72
Use of Insulation Shielding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
72
72
Grounding of the Insulation Shield . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shield Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
72
SplicesandTerminations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
73
Appendix H-Recommended Bending Radii for Cables . . . . . . . . . . . . . . . . . . . 74
scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
74
or h o r . . . . . . . . . . . . . . . . 74
Power Cables Without Metallic Sheath Shielding
Power CablesWith Metallic Sheath Shielding Sheaths orh o r . . . . . . . . . . . . . 74
Drum Diameters of Reels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Appendix L-Additional Conductor Information . . . . . . . . . . . . . . . . . . . . . . .
77
COPYRIGHT National Electrical Manufacturers Association
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NEMA WC*5 9 2
= b47024705027407bd
ICEA S-61402
NEMA WC 5-1992
Foreword
This Standards Publication for Insulated Wire and Cable for the Transmission
Dis- and
tribution of Electrical Energy was developed by the Insulated Cable Engineers Association and approved by the National Electrical Manufacturers Association.
ICEA/NEMA Standards are adopted in the public interest and are designed to eliminate
assist the user in selectmisunderstandings between the manufacturer and the user to
and
ing and obtaining the proper product for his or her particular need. Existence of and
IcEA/NEMA Standard does not in any respect preclude the manufacture or use of products not conforming to the standard. The user of this Standard
is cautioned to observe any
health or safety regulations and rule relative
to the manufacture and use of cable made in
conformity with this standard.
Requests for interpretationof this Standard mustbe submitted in writingto the Insulated Cable Engineers Association,
P.O. Box 440, South Yarmouth,MA 02664.An offcial written interpretation will be provided. Suggestions for improvements gained in the
use of this publication willbe welcomed by the Association.
Proposed or recommended revisions should be submitted
to:
Vice President, Engineering Department
National Electrical Manufacturer’s Association
2101 L St. N.W., Suite 300
Washington, D.C. 20037
V
COPYRIGHT National Electrical Manufacturers Association
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NEMA WC 5-1992
ICEA S-61402
scope
These standards apply to materials, constructions, and testing
of thermoplastic-insulated wires and cablesthat are used for the transmission and distribution
of electrical energy for normal conditions of installation and service, either indoors,
aerial, underground
or submarine.
The thermoplastic insulations and jackets covered in this publication
are compounds
of vinyl chloride and vinyl
acetate or
made from polyvinyl chloride or the copolymer
polyethylene.
vi
COPYRIGHT National Electrical Manufacturers Association
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STD.NEMA
WC 5-ENGL
1992
6470247 0513731 5 4 0
ICEA s-61402
NEMA WC 5-1992
Page 1
THERMOPLASTIC-INSULATED WIRE AND CABLE FOR
THE TRANSMISSION AND DISTRIBUTION OF ELECTRICAL ENERGY
Part 1
GENERAL
1.1
GENERAL
c. Aerial
INFORMATION
1) On messenger in meral M g s
Thest standards cover the requirements for conductors.
2)
On messenger with marlin ties
the insulations and protective coverings, and general con3)
Preassembled
smtim and dimensional derails common
U, most stand4) Fieldspun
ard types of wires and cables. Consauctions of specific
d
Direct burial in ground
typesare covered in Part 7. Wherea conflictexistsbetween
Submarine
e.
the requirements of Part 7 and thos of Farts 1 to 6 ,
f. Desaiptions other than the foregoing
inclusive, the requirements of Part 7 shall apply. Set A p
8.
Conditions
of installations
pendix E for complete titles and dates of ICEA Publicaa
.
Ambientremperature
tions and ASTM Standards to which referenceis made in
b. Number of loaded cables in dwt bank or conthis publication. See Part 6 for test procedures not elseduit If in conduit. give
typeof conduit (metallic
where r e f e r e n d
or nonmetallic), number of l o a d e d conduits,
Insulation thicknesses are designated in tams of cable
enclosed or exposed, and spacing between coninsulations levels (see3.2).
duits
In ciasslfying jackets and
sheaths in these standards, the
c.
Load
factor
term "jacket" refers to a continuous nonmetallic covering
6
Method
of bonding and punding of metallic
and "sheath" to a continuous metallic covering.
coverings
(including shields)
In th- standards. units are expressed in the English
e.
Wet
OT dry location
system. For infcumation only, their approximate metric
f. Thcnnalresistivity (rho) of soil
equivalents are included.
1.22 Quantities and Description of Cable
1.2 INFORMATION TO BE SUPPLIED
1. Total number of feet, including test lengths, and
BY PURCHASER
lengths if specific lengths arc required
When requesting proposals h m cable rnanufxturas,
2
lLpe
of cable. Describe as single conductor, twothe prospective purchaser should furnish the following
conductor
flac twoanductar
and such.
information:
3. Rated circuit voltage, phase to phase.
1.21 Characteristics of System on Which Cable
4. ?Lpe of conductor--cqpr or aluminum.
Is to Be Used
5. S i z e of conductor-American Wm Gauge (AWG)
1. Current-alrernaring or direct
or circular mils. If conditions require other than
2. Frequency-hem
standard stranding, a complete description
should be
phases or, if di3. Normal operating voltage between
given.
rect current,between conductors
6. Insuhion
If series lighting,
4. Number of phases and conductors.
7. Thickness of insuIation in mils.
give open-circuit voltageand stare whether system
8. Qpe of outer covering.
is operated with or without protectors
9. Maximumallowableoveralldiameter
in inches.
5. Cable insulation level(see 3 2 )
When duct space is not limited, it is desirable n a to
at which cable will be in6. Minimum temrestrict the overall diameter.
stalled
10. Method of conductor identification.
7. Description of installation
a. Inbuildings
b. In undergroundducts
round.
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
STD-NEMA
WC 5-ENGL
L992
m
b470247 0533732 487
m
ICEA s-61402
NEMA WC 5-1992
Page 2
Patt 2
CONDUCTORS
Note: Requirements of a referenced ASTM standard
should be determined in accordance with the procedure
or method designated in the referenced ASTM standard
unless otherwise specifiedin the standard.
The following
technical
information
on
typical
conductors may be found in Appendix L:
a.
Approximatediameters of individual wires in
stranded conductors.
b.
Approximate
diameters
of conductors not
listed in Table 2-7.
c.Approximateconductorweights.
I
2
1 WIRES, PHYSICALANDELECTRICAL
PROPERTIES
Thcwinsusedinconductorsshallbecoppainaccordance with 2.1.1 or aluminum in accordance with 2.12.
21.1 Copper Wires
Copper wires shall meet the requirunents of 21.1.1 and
cithcr2l.l2or21.1.3.?he2.1.13opaonshallapplyonly
to noncomprtssed and noncompact conducuxs.
21.1.1
Coppa
shall mect the chunical require-
ments of ASTM B 5.
21.1.2 Softor anncaled copper wires intended for a
stranded conductor shall mttf the elongation, finish,and
COBting continuity rtquinmentso€one of the following:
1. ASTMB3foruncoatedwixes.
2. ASTM B 33 forn
t
i
dwr
ies.
3. ASTM B 189 for lead M l&-dl~y-coatcd Wirts.
2.1.1.3 Copper wires removed from a concentric laystranded conductor, annealedafter stranding, shall meet
the elongation requirementsof ASTM B8.
2 1 2 Aluminum wires
Aluminum wircs shall meet the requirunents of 2.12.1
andejthn2.122~2.123.The212.3optionshallapply
only to nonam-cd
and noncompact condwtors.
The
requirements of 21.22 or 2.123 shall not apply if the
requirements of 23.1 or 232 arc met
2121 Aluminum 1350 wires shall meet the chunical
B 233.Aluminum alloy wirs shall
contain a minimum of 97 pemmt aluminum by weight
requirementsof A
S
"
21.22 Aluminum 1350 and aluminum alloy wires intended for a strandedconductor shall m e a one of the
following
1. Harddrawnwire shall meu the tensile. elongation,
finish,andbrittleness requirementsof ASTM B 230.
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
2 Annealedorintamediatttemperwinshallmcttthe
tensile and finish requirements of ASTM B 609. .
2.1.2.3 Aluminum 1350 and aluminumalloy
wires
removed from a concentric lay-stranded conductor shall
meet the tensile requirements and bending properties of
ASTM B 231.
SOUD CONDUCTORS
Solid conductorsshall meet the q
u
i
r
e
r
n
e
n
t
s of 22.1 ot
2.2
222.
2
.
2
1 A solid copper conductœ shall consist Of 2 singk
round wire mœting the rcquirtments given in 2.1.1.1 and
2.1.12.
222 Amlid aluminum 1350Q aluminum ~ O conducY
torshallconsistofasingleraundwirtmcetingthertquirt-
mentsgivenin2.12.1,222.l,andTabl~2-landthefinish
requirements of ASTM B 230. Tensile m
g
t
h of aluminum 1350 and aluminum alloy Conductors and elongation
ofaluminum alloy conductorsshall bedeterminedaccordingtoASTMB230.
2 2 2 1 S i v t 12 to 8 AWG solid aluminum conductors
shall be an aluminum alloy with an elongaion at rupture
of not less rhan 10 pacent in 10
2.3
STRANDED
CONDUCTORS
inches.
Stranded conductors shall consist of a number of wires
individually meeting the appropriate requirements of 2.1.
AU wires in a stranded conductor shall be of the same
material and temper.
Exceprion: Coated wires shall be permitted to be used
in only the outer layer of an uncoated conductor in order to
obtain freeshipping of an adjacent polymeric layer. The dc
resistance of the resulting conductor shall not exceed the
value specified for an uncoated conductor of the same s i x .
The requirements for lay, joints, and number of wires
shall be in accordance with one of the following:
1. ASTM B 8 for concmhic-lay Class B, C, or D
stranded copper conducuxs,
2 ASTM B 172 for 10pc-k~
stranded C o p P a conductors with bunch-strandedmcmbas.
3. ASTM B 173 for rope-lay strandcd coppa conducton with concentric-saandedmembers.
4. AsTh4 B 174 for bunch-stranded copper conduc-
tors.
5: ASTM B 4% for cotnpact-rotlnd ~mdedCoppa
conductors.
~~
-~
~
STD.NEMA WC 5-ENGL 1'792
~
~~
b 4 7 0 2 4 7 0533733 313
ICEA s-61402
NEMA WC 5-1992
Page 3
6. ASTM B 231 for concentric-lay Class B, C,or D
stranded aluminum 1350 or aluminum alloy conducuxs.
7. ASTM B 400 for compact-round stranded aluminum 1350 or aluminum alloy conductors.
There shall be no water in the stranded conductor of the
cable as shipped.
2.3.1 Concentric-lay-strandedaluminumconductors,
including compressed strand, if tested as a unit as an
alternative to 2.1.2.2 or 2.1.2.3 and before application
of any coverings,shall meet the tensile requirements
and bending properties of ASTM B 231.
2.3.2
Compact stranded
aluminum
conductors,
if
tested as a unit as an alternative to 2.1.2.2 and before
application of anycoverings,
shall meetthetensile
requirements of ASTM B 400.
2 4 CONDUCTOR SIZE UNITS
Conductor size shall be expressedby cross-sectional
area in thousand circular mils (kcmil).The AWG equivalents for small sizts shall be found in Table 2-7.
2.5 CONDUCTOR dc RESISTANCE PER UNIT
LENGTH
The dc resistance per unit length ofeach conductor in a
production or shipping lengthof compieted cableshall not
exceed the value determined h m the schedule of maximum dc resistances specified in Table 2-3when using the
appropriate nominal value specified in Table 24,Table
2-5, and Table26. The dc resistance shall be determined
in amrdance with 25.1 or 2.52.
Where the resistance is measured ona sample taken
h m
a multiple conductor cable, or w h a e the rtsistancc is
calculated,theappropriatemaximumresistancevalue
specified for a single conductor cable
shall apply.
25.1 Direct Measurement of dc Resistance Per
Unit Length
The dc resistance perunit length shall be determined by
dc resistance measurements made
in accordancewith 63.1
to an accuracy of2 percent or better. If measurements are
made at a temperature other than 25'C (77'F). the meas-
ured value shall be wnverred to resistance at 25 'C (77
by using either of the following:
1. The appropriate multiplying fàctor from Table 6-1.
2 Amdtiplying factor calculared using the applicable
formula in the foomote to Table 6-1.
If verification is required for the dc resistance measure
mentmadeonan
en& lengrh of completedcable, a
sample at least 1 foot (305 cm) longshall be cut from that
reel length, and the dc resistance of each conductor shall
be measured using a Kelvin-type bridge or a potentiometer.
where an uninsulated conducm is in m n m t with another metallic or conductive component
of the cable. measurement~shall be made on a sampietakenfrom
thc
completed cable.
2.5.2 Calculation of dc Resistance Per Unit
Length
The dc resistance per unit lengthat 25'C
calculated using the following fornuia:
(77.Fshall
) be
R=K p/A
WhereR=ConductorresistanceinNI000 fi.
K=Weightincrementfactor,asgiveninTable2-2.
p=Volume resistivity in fi.crniVfr, determined in x CDcdance with AST" B 193 using round wires
A=Crass-sectional arca of conductor in Lcmil, determined in accordance with 6.32.1
or 6.3.22for solid,
concentric-lay. rope-lay, and bunch-snanded conductors or 6.3.2.2 for compressed or compactstranded conductors.
When the volume resistivity is expressed in nanoohm
meta (nfbm) and arta is expressed insquare millimetas
(mm?the rtsistance is expressed in milliohm per meter
(mzum).
CONDUCTOR DIAMETER
The diameter of a conductor having a diameter less than
0.750 inch (19mm) shall be measured in accordance with
6.3.3.1. n e diameter of a conductor having a diameter
0.750inch (19 mm) or larger SM
be measured in accordance with 6.33.1 or 6.3.3.2 The diameter shall not dif€ex
2.6
Table 2-1
SOLID ALUMINUM 1350 AND ALUMINUM ALLOY CONDUCTORS
Cooductor S b
AWC
TtmIlcStrrngth
Alu minum U50
6
1243
7-1
Il0 and larger
...
12axL22000
59-152
8500-22000
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
Aluminum Alloy
MPa
I
.
.
83-152
Pd
MPa
1500&22000
1200&22000
85W-22OOO
103-152
83-152
59-152
ICEA SB1402
Page 4
from the nominal values shown in Table 2-7 by m m than
plus œ m i n u s 5 perctnt
insulation. The material shall have allowable operaring
26.1 'Iht 5 percent diamcter tolerance far d i d and
stranded wnduaus is provided to enable a designa of
c
o
m to detennine che range of conductor sizes that
will fit a particular connector;however, a conductor meeting the minimumdiametn requirementdots not necessarily mctL tht reqrrirunmtfor maximum & resisrancegiven
27.1 The stress control layershall be apolymeric coming consisting of a conducting tape. cxuudcd matcrial. œ
extruded maftrial over conducting tap. The layer shall
have a minimum thickness of 2 5 mils (0.06 mm).
in 25.
26.2 Ifm e or more layus of any conccnmc laystranded
Class B, C,or D conductor is c o m p s c d to reduce the
noncompnsscd outside diameta, the compression shall
not cxcetd 3 percent
2 7 STRESS CONTROL LAYER
Conductcns to be insulated for a rated circuit voltage
above 2OOO volts shall be covered wich a separatc stress
controlling mataiaicompatible with the conductor andthe
tempaaMtsatleastequaltoth~givenfœcheinsulation
mareriaI.
27.1.1 Extrudable
prior to application to the
conductor.when tested according to 6.6 shall meet the
following requirements:
Elongation after air oven test at lOO'C*l'C far
48 hours minimum pacent
Briulcnm tempaanrrt not warmer than *C
Solid Conductors
1
Conccnaic-lay Strand, Classes B,C,and D
uptomkanil
1.02
>2000-3000kcmil
1.03
>3CXXMOOO kcmil
1.04
1.05
"-5ooOlranil
RopIay Strand Having Concentric Stranded Members.
CksesGandH
49 Wirts
133 wires
259 wires
427 Wirts
Morc than427 Wirts
1.03
1.04
1.045
1-05
1.06
Bunched Strand. single bunches
Allsizes
Rope-lay S-d
Having Bunch-Stranded Members, -CS I. K,and M
7 bunch suandcd members
19
37
61
7x7 bunch stranded members
19x7
37fl
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-10
27.1.1 .1 The nsistivity of an extrudcd conducting material when measured according to 6.9.4 shall n a exceed
loo0 ohm-meter at m m tempexanue and at the maximum
normal optratinge
t
m
of the cable.
Table 2-2
WEIGHT INCREMENT FACTORS,K
61x7
100
1.02
1.04
1.o5
1.o5
1.05
1.06
1.07
1.07
1.07
ICEA S-61402
NEMA WC 5-1992, Revision 1
Page 5
from the nominal values shown in Table 2-7by more than
plus or minus 5 percent.
insulation. The material shall have allowable operating
temperaturesat least equal to those given for the insulation.
2.7.1 The stress control layer
shall be a polymeric cover2.6.1 The 5 percentdiametertoleranceforsolidand
ing consistingof a conducting tape, extruded material,
or
stranded conductors is provided to enable a designer of
extruded material over conducting tape. The layer shall
connectors to determine the range of conductor
sizes that
have a minimum thickness of2.5 mils (0.06mm).
will fit a particular connector; however, a conductor meeting the minimum diameter requirement doesnecessarnot
2.7.1.1 Extrudable material, prior to application to the
ily meetthe requirement for maximum
dc resistance given
conductor,
when tested according to 6.6 shall meet the
in 2.5.
following requirements:
2.6.2 If one or more layers
of anyconcentric lay stranded
Class B, C, or D conductor is compressed to reduce the
Elongation afterair oven testat lOO*C&l'C for
noncompressed outside diameter, the compression shall
48 hours
100percent
minimum
not exceed3 percent.
Brittleness
temperature
not
warmer than 'C
-10
2.7 STRESS CONTROL LAYER
2.7.1.1.1 The resistivity of an exbuded conducting.maConductors to be insulated for a rated circuit voltage
terial when measured according to6.9.4 shall not exceed
above 2000 volts shall be covered with a separatestress
controlling material compatible with the conductor and 10oO
the ohm-meter at m m temperature andat the maximum
normal operating temperature
of the cable.
Table 2-2
WEIGHT INCREMENT FACTORS',K
Solid Conductors
Concenmc-lay Strand, Classes
B, C, and D
up to 2000 kcmil
>2000-3000kcmil
>30004000kcmil
>400-5000 kcmil
1
1.02
1.O3
1 .O4
1.O5
Rope-lay Strand Having Concentric Stranded Members,
Classes G and H
49 wires
133 wires
259 wires
427 wires
More than 427 wires
1.06
Bunched Strand, single bunches
AU sizes
1.o2
Classes I, K,and M
Rope-lay Strand Having Bunch-stranded Members,
7 bunch stranded members
19
37
61
7x7 bunch stranded members
19x7
37x7
61x7
1 .O3
1.04
1 .O45
1.O5
1.o4
1.O5
1.O5
1.O5
1.o6
1 .O7
1.O7
1 .O7
*Based on themethod specified in either A S T M B 8, ASTM B 4%. ASTM B 400, ASTM B 231. A S T M B 172, ASTM B 173. or
ASTM B 174 as applicable.
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Licensed by Information Handling Services
NEMA WC 51992, Revision 1
Page 6
ICEA S-61-402
Table 2-3
SCHEDULE FOR ESTABLISHING MAXIMUM DC RESISTANCE
PER UNIT LENGTH OF COMPLETED CABLE
Cables with Conductors of 'hble 2-4
Maxlmum Resistana
Cable Type
Single Conductor Cables and
FLU Parallel Cables
Table 2 4 * value plus2%
(Rmax=Rx1.02)
Multiple Conductor Cables and Twisted
Assemblies ofSingle Conductor Cables
Table 2 4 * value plus2%plus one of the following:
2 C i n e Layer of Conductors
( R m a x = R x 1.02x 1.02)
3Cb"ore than One Layer of Conductors
(R max = R x 1.02 x 1.03)
40&-Pairs or other PrecabledUnits
( R m a x = R x 1.02x 1.04)
Cables with Conductors of Table 2-5 or 2-6
Maximum dc Resistance
Cable Qpe
SingleConductor&bl&and
Flat ParallelCablesTable
Multiple Conductor Cables and Twisted
Assemblies of Single Conductor Cables
2-5* or 2-6* valueplus 2%**
( R m a x = R x 1.02)
Table 2-5* or 2-6* value plus2%**plus 5%
(R max = R X 1.02 ~1.05)
'For conductor strandings or s i m not listed in Tables 2-4 throu 2-6,,thenominal dc resistance perunit length of a completed single conductor cable
shall be calculated from h e facton given in Table 2-8 using the%owmg formula:
R=
flA
WhereR = Conductor resitanw inn/loOO h.
f = FactorfromTable 2-8
A = Cross-sectional area of conductor in kcmil
Sec 25.2 for cross-sectional area duemination.
++For20 AWG and 18 AWG Class K conductors specified in Table 2-6 h i s value shall be 3 percent
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ICEA s-61402
NEMA WC 5-1992, Revision 1
Page 7
Table 2-4
NOMINAL DC RESISTANCE INOHMS PER o
l0
0F E F AT 25'C WF)
OF SOLID AND CONCENTRIC LAY-STRANDED CONDUCTOR
Conductor
'Ize
Aluminum
Coated
AWG or kann
Concentric Lay.Stranded**
Mid
Aluminum
Copper
UncoatedUncoated
copper
Coated
ClassB,C, D
Class B
16.7
27.4
10.5
17.3
8.33
13.7
6.67
10.9
8.54
5.21
6.85
4.18
3.30
5.41
263
4.3 1
3.41
208
1.66
272
1.31
215
1.70
1.04
0.825
1.35
0.652
1 .o7
0.519
0.851
0.411
0.675
0.325
0.534
5
0.258
0.424
4
0.205
0.336
3
0.162
0.266
2
0.211
1
0.207
O.129
O.164
o. 168
o. 102
lm
0.130
0.0810
0.133
2m
0.103
0.0642
0.105
3m
0.0500
0.0819
0.0510
0.0836
410
0.0431
250
0.0694
...
...
0.0707
300
0.0578
0.0360
...
...
0.0590
350
...
...
0.0505
0.0495
0.0308
0.0433
0.0269
...
400
...
0.0442
0.0385
0.0240
...
...
450
0.0393
0.0347
0.0216
500
...
...
0.0354
550
...
...
...
0.01%
0.0321
...
600
...
...
0.0180
0.0295
0.0166
650
...
...
...
0.0272
700
...
...
...
0.0154
0.0253
...
...
750
0.0144
...
0.0236
800
0.0135
0.0221
...
...
...
0.0120
0.0196
...
900
...
...
0.0177
lo00
...
...
...
0.0108
1100
0.0161
...
...
...
0.00981
1200
...
...
...
0.00899
0.0147
1250
0.00863
0.0141
...
...
...
...
...
1300
0.0136
...
0.00830
1400
0.0126
...
...
0 . m1
...
1500
0.0118
...
...
...
0.00719
...
...
1600
...
0.00674
0.0111
1700
...
0.00634
...
...
0.0104
1750
..*
...
0.00616
...
0.0101
1800
...
...
...
0.00599
0.00982
...
0.00568
...
...
1900
0.00931
2000
...
...
...
0.00885
0.00539
w)o
...
...
0.00715
0.00436
...
3000
...
...
...
0.005%
0.00363
...
3500
...
...
0.00515
0.00314
...
...
4000
0.00451
...
0.00275
4500
...
...
... 0.00254
0.00i47
0.00405
5000
...
."
...
0.00229... 0.00222 0.00364
*Resistanœ values inmillohms Der metex shall be obtained bv multiDlvinp
.. the above valueslm 3.28
17.9
11.1
8.83
7.07
5.52
4.43
3.43
2.73
2.16
1.72
1.36
1 .o8
0.856
0.678
0.538
0.427
0.338
0.269
0.21 3
O.169
0.134
0.106
0.0842
0.0667
0.0524
0.0448
0.0374
0.0320
0.0277
0.0246
0.0222
0.0204
0.0187
0.0171
0.0159
0.0148
0.0139
0.0123
0.0111
0.0101
22
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
ClassB,C,D
27.1
16.9
13.5
10.7
8.45
6.72
5.32
4.22
3.34
2.66
211
1.67
1.32
1 .05
0.833
0.661
0.524
0.415
0.329
0.261
16.5
10.3
8.20
6.51
5.15
4.10
3.24
2.57
2.04
1.62
1.29
1 .o2
0.808
0.640
0.508
0.403
0.319
0.253
0.201
O.159
o. 126
o. 100
0.0794
0.0630
17.2
10.7
8.52
6.76
5.35
4.26
3.37
267
212
1.68
1.34
1 .o6
0.831
0.659
0.522
0.4 14
0.329
0.261
0.207
0.164
O.1 30
0.1m
0.0813
0.0645
0.0511
I
"Concentric-lay stranded includes compressed and compac;condudon.
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
0.00925
0.00888
0.00854
0.00793
0.00740
0.00694
0.00653
0.00634
0.00616
0.00584
0.00555
0.00448
0.00374
0.00323
0.00283
ClSSC
cl= D
...
...
...
...
...
...
...
2.i9'
2.21
1.75
1.36
1.08
0.856
0.678
0.538
0.427
0.339
0.269
0.213
0.169
0.134
0.106
0.0842
0.0669
0.0530
0.0448
0.0374
0.0320
0.0280
0.0249
0.0224
0.0204
0.0187
0.0172
0.0160
0.0149
0.0140
0.0126
0.0111
0.0102
0.00934
0.00897
0.00861
0.00793
0.00740
0.00700
0.00659
O.Oo640
0.00616
0.00584
0.00555
...
...
...
...
.
1
...
...
...
...
...
...
2.83'
2.22
1.75
1.39
1.11
0.874
0.680
0.538
0.427
0.339
0.269
0.213
O.169
0.134
o. 106
0.0842
0.0669
0.0530
0.0448
0.0374
0.0320
0.0280
0.0249
0.0224
0.0204
0.0187
0.0173
0.0160
0.0150
0.0140
0.0126
0.01 12
0.0102
0.00934
0.00897
0.00862
0.00801
0.00747
0.00700
0.00659
0.00640
0.00622
0.00589
0.00560
...
...
...
...
...
...
NEMA WC 5-1992, Revision 1
ICEA S-61-402
Page a
Table 2-5
NOMINAL dc RESISTANCE INOHMS PERo
o
l0F E P AT 25'C (77'F)
FOR FLEXIBLE ALUMINUM CONDUCTORS
ConductorSize, AWC or kcmil
0.00919
class G
class H
...
...
...
...
...
8
7
6
0.858
0.68 1
5
4
3
0.540
0.428
o.340
1..
...
cl- I
1.o7
0.850
0.687
0.545
0.432
0.343
0.272
0.216
O. 172
2
1
110
0.269
0.216
O. 17 1
0.272
U0
O. 136
310
410
250
300
350
O. 107
0.0852
0.0725
0.0604
0.05 18
O. 136
O. 108
0.0857
0.0728
0.0607
0.0520
0.0735
0.0613
0.0525
400
450
500
0.0453
0.0403
0.0363
0.0455
0.0405
0.0364
0.0460
0.0409
0.0368
550
600
650
700
750
800
900
lo00
1100
1200
1250
1300
1400
1500
1600
0.033 1
0.0304
0.0280
0.0334
0.0306
0.0283
0.0334
0.0306
0.0286
0.0260
0.0243
0.0228
0.0263
0.0245
0.0230
0.0265
0.0247
0.0232
0.0202
0.0 182
0.0166
0.0204
0.0184
0.0167
0.0206
0.0186
0.0169
0.0152
0.0146
0.0140
0.0153
0.0147
0.0141
0.0 155
0.0148
0.0143
0.0130
0.0121
0.0115
0.0131
0.0123
0.0115
0.0133
0.0124
0.0116
1700
1750
1800
0.0108
0.0105
0.0102
0.0108
0.0105
0.0102
0.0109
0.0106
0.0103
1900
20oo
0.00968
0.00968
0.00977
+Resistanœval=
...
O. 172
in milliOhms per meter shall be obtained by multiplying the above values by 3.28.
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
0.137
o. 109
0.086 1
NEMA WC 5-1992, Revision 1
Page 9
ICEA S-61402
Table 2-6
NOMINAL dc RESISTANCEIN OHMS PERo
lo
0FEET" AT 25'C (77'F)
FOR FLEXIBLE ANNEALED COPPER CONDUCTORS
ConduetorSize,
AWG or kcmil
20
18
16
14
12
10
9
8
7
6
Uncoated
Clrnss G
ClwH
Class1
..
...
...
...
...
.
...
265
1.67
1.05
0.832
0.660
...
...
...
...
0.6G
...
...
...
1 .o4
0.824
0.653
0.518
0.419
0.332
0.263
CoOted
ClassK
10.6
6.66
4.18
262
1.65
1.o4
0.840
0.666
0.528
0.419
0.332
0.263
0.211
O.1 67
0.133
0.105
0.0842
0.0668
0.0530
0.0448
0.0374
0.0323
0.0283
0.0251
ClassM
10.6
6.66
4.18
262
1.68
1 .o6
0.840
0.666
0.533
0.423
0.336
0.266
0.213
O. 169
O.134
0.106
0.0850
0.0674
0.0535
0.0453
0.0377
0.0323
0.0283
0.0251
0.0226
ClassC
ClassH
Class1
...
...
...
...
...
...
...
...
...
...
...
2.81
1.77
1.11
0.884
0.701
0.544
0.432
0.342
0.271
0.215
0.171
O.137
0.108
0.0859
0.0682
0.0541
...
...
o.ii
0.561
0.445
0.353
5
0.280
4
0.222
3
0.209
0.209
0.172
o. 166
O.166
2
o. 140
0.131
1
O.132
0.109
o. 105
o. 105
1/0
0.0863
0.0830
0.0834
m
0.0685
0.0662
0.0655
0.0659
3/0
0.0543
0.0522
0.0525
0.0520
4/0
0.0462
0.0460
0.0444
0.0442
0.0448
250
0.0385
0.0383
0.0374
0.0370
0.0368
300
0.0330
0.0328
0.03 16 0.0317
350
0.0320
0.0278
0.0280
0.0289
0.0287
0.0276
400
0.0257
0.0255
0.0247
0.0249
450
0.0246
0.0224
0.0231
0.0230
0.0222
0.0221
0.0226
500
0.0212
0.0204
0.0204
0.0206
0.0206
0.0210
550
0.0202
0.0194
0.0192
0.0189
0.0187
600
0.01 85 0.0187
0.01 89
0.0179
0.0178
0.0174
0.0174
0.0174
0.0172
650
0.0171
0.0167
0.0168
0.0165
0.0162
0.0162
0.0162
700
0.0159
0.0155
0.0149
0.0148
0.0151
0.0151
0.0151
0.0154
750
0.0140
0.0146
0.0141
0.0141
0.0141
0.0144
800
0.0139
0.0130
0.0126
0.0128
0.0125
0.0126
0.0126
0.0123
900
0.0113
0.01 17
0.0113
0.01 15
0.0112
0.0113
loo0
0.0111
0.0106
...
0.0105
0.0102
0,0103
0.0101
...
1100
0.00971
0.00962
0.00934 0.00943
1200
0.00925
...
...
0.00897
0.00933
1250
0.00888
0.00924
0.00905
...
...,
0.00897
0.00888
...
...
0.00862 0.00810
1300
0.00854
0.00801
0.00833
...
...
0.00825
0.00808
1400
0.00793
0.00777
...
0.00770
0.00747
1500
...
0.00740
0.00754
0.00701
0.00729
1600
0.00701
...
...
0.00729
0.00707
0.00686
0.00686
...
1700
0.00659
0.00659
0.00666
...
0.00666
1750
0.00641
0.00641
0.00666
0.00647
...
...
0.00648
1800
0.00623
0.00648
...
0.00623 0.00629
...
0.00590
0.00590
0.00596
1900
...
...
0.00614
0.00614
0.00619
2Ooo
0.00566
0.00561
0.00561
...
...
0.00588
0.00583
0.00583
*Resistance values in milliOhms p e r meter shall be obtained by multiplying the above valuwby 3.28.
0.523
0.415
0.329
0.261
0.207
0.164
0.131
0.104
0.0826
0.528
0.419
0.332
0.263
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
1.08'
0.857
0.679
0.539
0.436
0.346
0.274
0.217
0.172
0.137
0.109
0.0868
0.0688
0.0546
0.0466
O 0389
0.0333
0.0291
0.0259
0.0233
0.0212
0.0194
0.0181
0.0168
0.0157
0.0147
0.0131
0.0118
0.0107
0.00981
0.00941
0.00905
0.00841
0.00785
0.00735
0.00692
0.00672
0.00654
ClassK
11.4
7.15
4.49
282
1.77
1.12
0.902
0.715
0.567
0.450
0.357
0.283
0.227
0.180
0.142
0.113
0.0904
0.0717
0.0569
0.0481
0.040 1
0.0347
0.0304
0.0270
ClmM
11.4
7.15
4.49
282
1.81
1.14
O.902
0.715
0.573
0.454
0.360
0.286
0.227
0.181
0.144
0.114
0.0913
0.0724
0.0574
0.0486
0.0405
0.0347
0.0304
0.0262
0.0243
0.0221
0.0243
0.0221
0.0202
0.0203
0.01 87 0.01 87
0.0174
0.0174
0.0162
0.0162
0.0152
0.0152
0.0135
0.0135
0.0122
0.0121
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
NEMA WC 5-1992, Revision 1
Page 10
ICEA S-61402
Table 2-7
NOMINAL DIAMETERSFOR COPPER AND ALUMINUM CONDUCTORS
Nominal Diametern*
Concentric Lay Stranded
Conductor Size
AWG
kcmil
Sdid,Inch
22
0.812
1.02
1.29
1.62
205
258
3.26
4.11
5.18
6.53
8.23
10.38
13.09
16.51
20.82
26.24
33.09
41.74
5262
66.36
83.69
105.6
133.1
167.8
21 1.6
250
300
350
0.0253
0.0320
0.0359
0.0403
0.0453
0.0508
0.0571
0.064 1
0.0720
0.0808
U)
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
110
210
3/0
4/0
400
450
500
550
600
650
700
750
0.0907
0.1019
0.1144
O. 1285
0.1443
O. 1620
0.1819
0.2043
0.2294
0.2576
0.2893
0.3249
0.3648
0.4096
0.4600
0.5000
0.5477
0.5916
0.6325
0.6708
0.7071
...
...
...
...
...
...
Clam B, Inch
ClassC, Inch
Class D, Ineh
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
0.0629
0.0704
0.0792
0.0888
0.0998
0.112
0.126
0.141
O. 158
0.178
0.200
0.225
0.252
0.283
0.322
0.361
0.406
0.456
0.512
0.558
0.611
0.661
0.706
0.749
0.789
0.829
0.866
0.901
0.935
0.968
1.o00
1 .o61
1.117
1.173
1.225
1.25 1
1.275
1.323
1.370
1.415
1.459
1.480
1SU2
1.542
0.0648
0.0727
0.0816
0.0915
0.103
0.116
0.130
0.146
0.164
0.184
0.206
0.232
0.260
0.292
0.332
0.372
0.4 18
0.470
0.528
0.575
0.630
0.681
0.728
0.772
0.813
0.855
0.893
0.929
0.964
0.998
1.030
1.o94
1.152
1.209
1.263
1.289
1.314
1.365
1.412
1.459
1.504
1.526
1.548
Inch
Compact, Inch
Compressed,
...
...
...
...
...
...
...
...
...
...
...
...
0.134
...
0.169
0.2i3
0.238
0.268
0.299
0.336
0.376
0.423
0.475
0.520
0.570
0.616
0.659
0.700
0.736
0.775
0.813
0.845
0.877
0.908
0.938
0.999
1.o60
800
...
900
loo0
...
1100
...
...
1200
...
...
1250
...
...
1300
...
1400
...
...
1 500
...
...
1600
...
...
...
...
1700
...
1750
...
1800
...
...
...
1900
...
2000
...
...
+Diametersin millimeters shall be obtained by multiplying the above values in inches by 25.4.
...
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
...
...
...
0.0735
0.0825
0.0925
o. 104
0.117
0.131
0.148
o. 166
O. 186
0.208
0.234
0.263
0.296
0.333
0.374
0.420
0.471
0.529
0.576
0.63 1
0.681
0.729
0.773
0.814
0.855
0.893
0.930
0.%5
0.999
1.032
1.093
1.153
1.210
1.X4
1.290
1.316
1.365
1.413
1.460
1.504
1.527
1.548
1.590
1.590
." .
~.
1.632 1.632 1.632 1.583
~
...
...
...
0.0735
0.0826
0.093 1
o. 104
0.117
0.132
0.148
o. 166
0.166
0.209
0.235
0.264
0.297
0.333
0.374
0.420
0.472
0.530
0.576
0.63 1
0.682
0.729
0m3
0.815
0.855
0.893
0.930
0.%5
0.998
1.032
1.095
1.153
1.211
1.264
1.290
1.316
1.365
1.413
1.460
1.504
1.527
1.549
1.59 1
4
ICEA S-61402
NEMA WC 5-1992, Revision 1
Page 1OA
Table 2-8
FACTORS FOR DETERMINING NOMINAL RESISTANCE
OF STRANDED CONDUCTORSPER 1O00 FEET
Diameter of Individual Coated Copper Wlres h Inches
for Stranded Conductors
0.460
AU Sizes, Uncoated
96.16
Conductivity,
Percent
97.16
to 0290,
Under 0.290
to 0.103,
Aluminum
Indusive
Indusive
Copper
97.66 61
25'C
Under 0.103
to 0.0201,
Inclusive
100
25'C
2s
2sc
2S.C
c 25'C
Under 0.0201
to 0.0111,
Inclusive
Under o . o u
to 0.0010,
94.16
93.15
...
InelupiVe
25'C
Rope Stranded
49 strands
133 strands
259 strands
427 strands
More than 427 strands
11 153
11261
113 15
11370
11478
11210
11319
11374
11428
11537
11327
11437
11492
I1547
11657
11568
11681
11737
11793
11905
...
...
...
17691
10786
...
...
11217
11456
11579
18038
10998
...
11437
11681
11806
18212
11104
...
...
...
...
11 547
11793
11920
11657
1 1 905
12033
...
11767
12018
12 147
11 102
11211
11319
11428
11217
11327
11437
11547
11456
11568
11680
11792
11580
11694
11807
11921
17865 10892
18038 10998
18125 11051
18212 11104
18385 11209
...
Bunch Stranded
All sizes
Rope-stranded Bunches
7 ropes of bunched
strand
19.37, or 61 ropes of
bunched strand
7x7 ropes of bunched
strand
19.37, or 61x7 ropes of
bunched strand
18385
11209
..L
...
18559
11315
Concentric Stranded
17692
Up to 2000 kcmil
17865
>2OOO to 3000 kcmil
18039
>3000 to 4000 kcmil
>4ooo to 5000 kcmil
18212
11104
10786
10892
10998
11045
1 1153
1 126 1
11369
The factors given in Table 2-8 are based on the following:
A. Resistivity
1. Avolume resistivity of 10.575 R .anil/ft (1ooQo conductivity)at Z,*C for uncoated (bare)
2 A 2% volume reslstivi coverted f m the 2WC values specified m ASTM B 33 or A S ' I U T i 9 for coated copper.
3. A volume resistivity of 8.345 R .anilfi (61.0% conductivity) at 25'C for alummum
B Increasein Resistance Due to Stranding
1. The value of K (weight increment factor) given in Table 2-2
*SeeTable 2 3 for Use of Factors.
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
~~
~
~
S T D - N E M A WC 5-ENGL 1992
6470247 0533735 176
ICEA S-61-402
m
NEMA WC 5-1992
Page 11
Part 3
. INSULATION
MATERIAL
3.1
The insulationshallbeathermoplastictype
compoundmeetingthedimensional,electrical,and
physical requirements specified in Part 3.
of
3.2
INSULATION
THICKNESSES
The insulation thickness given in Table 3-1, 3-2A
and 3-2B are based on the rated circuit voltage, phase
to phase, and on the rated cable insulation level.
The thicknesses of insulation given in Tables 3-1,
3-2A and 3-2B shall apply to single-conductor cables
and to the individual conductors of multiple-conductor
cables, except as otherwise specified in 3.3 and 3.4.
The average thickness of theinsulationshallbe
not less than that given in Tables 3-1, 3-2A and 3-2B.
The minimumthicknessshall
be not lessthan 90
percent of the values given in Tables 3-1, 3-2A and 32B. (See 6.4.3 for method of measurement.)
The insulation on the conductor shall be bee bom
any contaminants or porosity visible to the eye with not
morethan five times ma,onification. There shall be no
water in the stranded conductor of the finished
cable.
The thickness of insulation for the various systems
shall be determinedas follows:
3.2.1 Three-phaseSystemsWith100or133
Percent Insulation Level
Usethethicknessvaluesgivenintherespective
columns of Tables 3- 1,3-2A, 3-2B.
3.2.2
Delta
Systems
Where
One
Leg
May
Be Grounded For Periods Over 1 Hour
See 173 percentlevel
Table 3-2B.
in footnote
**
following
3.2.3 Single-andTwo-PhaseSystemsWith
100 And 133 Percent Insulation Level
Fornonshieldedcables,multiplythevoltageto
ground by 1.73 and use the resulting voltage value to
selectthecorrespondinginsulationthicknessfrom
Tables 3-1 or 3-2A.
For shielded
cables,
multiply
the
voltage
to
ground by 1.73 and
select
the
corresponding
insulation thickness from the 100 percent insulation
level orthe 133 percentinsulationlevelcolumn
of
Table 3-2B, as applicable.
DirectCurrentSystems
Up to and including 2000 volts. consider the same
as three-phase
alternating-current
systems
in
3.2.4
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
accordance with 3.2.1. Over 2000 volts, consult the
manufacturer.
3.3
INSULATION
THICKNESSES
FOR
SUBMARINE POWER CABLES
3.3.1 For polyvinyl-chlorideinsulationwithouta
thermoplastic jacketor ametallicsheath,
15 mils
(0.38 mm) shall be added to the insulation thicknesses
givenin Table 3-1. Forpolyethyleneinsulation, the
thickness shall be as given in Tables 3-2A and 3-2B
except that, for cable without a jacket or a sheath, it
shall be not less than 60 mils (1.52 m m )
3.3.2 For single-conductor
polyvinyl-chlorideinsulated power cables without a thermoplastic jacket
or continuous metallic sheath and
for installation in
15 mils
undergroundductsordirectearthburial,
(0.38 m m ) shall be added to the insulation thicknesses
given in Table3- 1.
INSULATION
THICKNESSES
FOR
SERIES LIGHTING CIRCUITS
The average thickness of insulation for cables for
useonserieslightingcircuitsshallbe
not less than
that given in Table 3-3. The minimum thickness shall
be not be less than 90 percent of the values given in
Table 3-3. (See 6.4.3 for method of measurement.)
3.4
REPAIRS
3.5
Repairs or joints in the insulation shall conform to
thelimitations on insulationthicknessgivenin
3.2.
Each length of insulated conductor containing repairs
or joints shall meet the electrical test specified in 3.7
through 3.9, as applicable.
3.6
INSULATION
TYPES
AND
REQUIREMENTS
13.6.1
Types
The types of insulationsshallbepolyvinyl-chloride
(includingcopolymers of vinyl chlorideand vinyl
acetate) (see 3.7 and 3.8) and polyethylene (see 3.9).
3.6.2
Voltage
tests
(See 6.1 1.) Completedcableshall
be tested in
accordance with the paragraphs specified in Table 34. The cable shall withstand, witnout failure, the test
voltagegiven
in Table 3-1,3-2, 3-3, or 3-5, as
applicable.
The testvoltagesshallbebased
on therated
voltage of the cable and the size of the conductor and
not on the apparent thickness of the insulation.
ICEA S-61-402
NEMA WC 5-1992
Page 12
3.6.3
InsulationResistanceConstants
The insulation resistance constants of
insulations shall bein accordance with 3.7,3.8,3.9,
or 3.10as applicable (see 6.12 for test methods).
This insulatipn is suitable for use at conductor
temperaturesnotexceeding(60"(140°F),in
dry
days or
wet locations,atamaximumvoltageratingof600
volts for powercircuits,and 5000 voltsforseries
lighting circuits.
3.7.1 PhysicalandAgingRequirements
Physical Requirements
Tensile Strength, minimum
1500
10.3
Elongation at rupture.
minimum
percent
100
Aging Requirements
Cold bend, - 1O"Ct1"C
65
5*0
10.0
10.0
5.0
3.7.3.1 DIELECTRIC STRENGTH RETENTION
75°C
POLYVINYL-CHLORIDE
3.8
This insulation is suitable for use at conductor
temperatures not exceeding 75°C (167'F), in dry or
wetlocations,atamaximumvoltageratingof600
5000 voltsforseries
voltsforpowercircuits,and
lighting circuits.
3.8.1
PhysicalandAgingRequirements
(See
6.4.)
The
insulation
following requirements:
shall meet
the
85*
85*
50
no
no cracks
Flame test
see 6.5
*For sizes 6 AWG and larger where buffed diecut specimens are
used. the minimum elongation and tensile strength. as a pcnxntagc
of the unaged values. shall be not less than the following:
1. Elongation after air oven test
45%
2. Tensile sangth after oil immersion
80%
3. Elongation after oil immersion
60%
3.7.2
"C
Dielectric constant after 24 hours, maximum
Increase in capacitance, maximum, percent
14
1 to
days 7 to 14
(See
6.7.4.)
The
dielecmc
strength
of the
insulation shall be tested at 50°C+1"C and shall
be
notlessthan
50 percent of theoriginaldielecmc
strength.
(See
6.4.)
The
insulation
shall
meet
the
following requirements:
After air oven test at1OO0C+loC.
for 168 hours
tensile strength, minimum, percentage of
unaged
Elongation at rupture, minimum,
percentagevalue.
of unaged
After oil immersionat 7O"C*l0Cfor 4 hours
Tensile strength, minimum, percentageof
unaged
Elongation at rupture,minimum,
percentagevalue.
of unaged
distortion,
Heat
121"C*l0C.maximum
percent of unaged value
cracks
Heat shock. 121"Clt1°C
(See
6.7.)
The
insulation
shall
meet
the
following requirements:
I Electrical Method,60 Hz at 50"Cfl
3.7
POLYVINYL
CHLORIDE
60°C
psi
MPa
3.7.3
AcceleratedWaterAbsorption
Requirements
Electrical
Requirements
3.7.2.1 VOLTAGE TESTS
See 3.6.2.
13.7.2.2 INSULATION RESISTANCE
See(6.12.)Eachinsulatedconductor,size
14
AWG and larger, in the completed cable shall have an
insulation resistance not less than that corresponding
to a constantof 500 at 15.6"C (60°F).
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
Physical Requirements
Tensile Strength, minimum
psi
MPa
Elongation at rupture, minimum percent
2000
13.8
150
Aging Requirements
After air oven test at 12loC&l0C,for 168 hours
Tensile strength. minimum, percentage of
unagcd value.
Maximum
Minimum
Elongation at rupture. minimum,
percentage of unaged value.
7O0C&I0Cfor 4 hours
After oil immersion at
Tensile strength,minimum, percentage
of unaged value
Elongation at rupture, minimum,
percentage of unaged value
120
80
75*
85*
85*
Heat distortion,121"C*l"C,maximum,
percentage of unaged value
~~
STD-NEMA WC 5-ENGL 3992
b470247 0533737 Tb9
ICEA S-61-402
NEMA WC 5-1992
Page 13
no"C 1"C?Heat
shock,
1 12
cracks
no-3O"C+l"C
bend,
Cold
cracks
test
Flame
*For sizes 6 AWG and larger where buffed die-cut specimens are
used, the minimum elongation and tensile strength, as a percentage
of the unaged values, shall be not less than the following:
1. Elongation afteiair oven test
50%
2. Tensile strength after oil immersion
80%
3. Elongation after oil immersion
60%
3.8.2
Electrical
Requirements
3.8.2.1 VOLTAGE TESTS
See 3.6.2.
(See6.12.)Eachinsulatedconductor,size14
insulation resistance not less than that corresponding
to a constantof 2000 at 15.6"C (60°F).
AcceleratedWaterAbsorption
Requirements
(See 6.7.) The insulation shall meet the following
requirements:
10.0
Increase in capacitance, maximum, percent
1 to 14 days
7 to 14 days
4.0
2.0
3.8.3.1 DIELECTRIC STRENGTH RETENTION
(See
6.7.4.)
The
dielectric
strength
of the
insulation shall be tested at 75"C&l"C and shall be
notlessthan60percent
of theoriginaldielectric
strength.
3.9
Physical and AgingRequirements
The insulation shall be tested in accordance with
6.4.11,6.4.12,6.9.1,and6.9.2andshallmeetthe
following requirements:
MPa
AWG and larger, in the completed cable shall have an
Electrical Method, 60 Hz. at 75"C+1 "C
Dielectricconstantafter24 hours, maximum
3.9.1
Physical Requiremenrs (see 6.4)
Tensile strength, minimum
psi
3.8.2.2 INSULATION RESISTANCE
3.8.3
Classes ** A, B, or C; Category 4 or 5 ; Grade E4 or
E5. The requirementsofASTM D 1248shallnot
applytoinsulationremovedfromtheconductor.
The insulation on the conductor shall be free from
any contaminants or porosity visible to the eye
with
not more than five times magnification.
POLYETHYLENE
INSULATION
This insulation is suitable for use in dry
or wet
locationsatconductortemperaturesnotexceeding
75°C (167°F)fornormaloperation,95°C(203°F)
for emergency overload conditions upto 5000 volts,
90°C(194°F) for emergencyoverloadconditions
from 5001 through 35000 volts, and 150°C (302°F)
for
short-circuit
conditions.
The
polyethylene,
beforeapplication to theconductor,shallcomply
withtherequirements of ASTM D 1248*,Type I;
* S e e Appendix E.
** See Note 4, Table 3-2.
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
Elongation
at rupture, minimum percent
Aging Requirements (see 6.4)
Tensilestrengthminimum,percentage of
unaged value
Environmental
cracking
(see
6.9.1)*
Absorption
coefficient,
minimum
milli(absorbance/meter)** (see 6.9.2)
1400
9.65
350
75
no cracks
320***
*
Applies to insulations for rated voltages of 2001 through
35,000 volts
** Applies to ASTM D 1248, Class C materials.
***In lieu of testing finished cable jackets, a certification b the
manufacturer of the polyethylene compound that this
requirement has been complied with shall suffice.
3.9.2
Electrical
Requirements
3.9.2.1 VOLTAGE TESTS
See 3.6.2.
3.9.2.2 INSULATION RESISTANCE
Each insulated conductor in the completed cable
shall have an insulation resistance not less than that
corresponding to constant of 50,000 (30,000 for
composite insulations in accordancewith 7.4.3 based
onthetotalcompositewallthickness)
at 15.6"C
(60°F).
3.9.2.3 PARTIAL-DISCHARGE EXTINCTION
LEVEL
Eachlengthofpowercableratedforserviceat
2001 volts and above with insulation shielding on the
individualconductorsshallbetested
in accordance
withICEAT-24-380andshallmeetthefollowing
requirements:
STD.NEMA WC 5-ENGL 1992
NEMA WC 5-1992
Page 14
8
11
ICEA S-61-102
2001-5000
4
5001-8000
6
After oil immersion at 100'Czl 'C for %
hours (conditiondwith nylon intact)
Tensile strength, minimum, percentage
of
unaged value(with nylon removed)
Elongation at rupture, minimum,
percentage of unaged value (with nylon
removed)
5$
8001-15000
15001-
19
Heat distonion, 136'Ckl 'C, maximum,
percentage of unaged value
26
Z
O
O
0
25001-
21
...
26
...
Heat shock,121'Ckl 'C
28000
28001-
Cold bend, -25'Ckl.C
35000
Flame test
~~
50
25
no
cracks
no
cracks
see 6.5
~
+Unless otherwise indicated.the cable will b rated 100percentinsulation
le*el.
50
no
mcks
*For sizes 6 AWG and la er where buffed die-cut specimens arc used
the minimum elongationa%r air ovm
as a pcmnlage of the maged
values, shall not bc less than 45%.
wrap test
3.9.2.4 INSPECTION FOR EVIDENCE OF WATER
test.
Each length cf completed shielded cable 2001 volts and
3.10.2 Electrical Requirements
in accordabove shall be inspected for evidence of water
ance with 6.15.If evidence of water is present, affected
the
3.10.2.1 VOLTAGE TESTS
cable length shallbe dried by a suitable method.
See 3.6.2.
3.10 POLYVINYL-CHLORIDEMYLON
This insulation is suitable for
use at conductor tempera3.10.2.2 INSULATIONRESISTANCE
tures not exceeding 90'C (194
'
F
)
in dry locations or75 'C
(See 6.12.) Each insulated
conductor,
size
14
(167.F) in wet locations. at a maximum voltage rating of
, AWG and larger, in the completed cable shall have
an
600volts for power circuits.
insulation resistance not less than that corresponding
3.10.1 Physical and Aging Requirements
1 to a constantof 3000 at 156°C (60'F).
(See 6.4.) The insulation shall meet the following re3.1 0.3 Accelerated Water Absorption
quirements with the nylon covering unless
intact otherwise
Requirement
specified.
(See 6.7.) The insulation shall meet the following
requirements when tested with the nylon removed:
Physical Requirements
Electrical Method. 60
at 7S0Cfl0C
Tensile strength, minimum (with nylon
removed)
Dielectric constant after 24 hours, maximum
10.0
psi
2000
Increase in13.8
capacitance, maximum, percent
MPa
1 to 14 days
6
Elongationatrupture,minimum,percent150
7to 14 days
3
~
I
Hz.
Aging Requirements
After air oven test at 136'C51'C for168 hours
value
(with nylon removed)
of
Tensile strength. minimum, percentage
unaged
Elongation atrupture, minimum,
percentage
unaged
of
value
75
65*
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
3.10.3.1 DIELECTRICSTRENGTH
RETENTION
(See 6.7.4.) The dielectric strength of the insulation of
a 14 AWG with the nylon removed shall be tested at 75OC
flocandshall be notlessthan 60 percent of the
original dielecmc strength.
ICEA S-61-402
NEMA WC 5-1992
Page 15
Table 3-1
CONDUCTOR SIZES, INSULATION THICKNESSES AND TEST VOLTAGES
FOR POLYVINYL-CHLORIDE-INSULATED POWER CABLES'
P
Voltage,
Rated
Circuit
Phase to Phase.
Volts**
0-600
Conductor
Size
AWG or
Insulation Thickness++
kcmil***
18-16'A
14-9 A
1.52
8-2
12.03
40
225-500
525-1000
2.79
3.18
1025-2000
mils
mm
30
45
0.76
1.14
60
80
95
1
110
125
* For series lighting cable, see Table
3-3.
* * The actual operating voltage shall not exceed the
***
I +
1.5
kV"
dc
-
3.0
3.5
6.0
10.5
4.0
5 .O
6.0
7.0
15.0
21.0
-
-
9.0
10.5
12.5
15.0
18.0
21.o
10.0
12.5
15.0
17.5
20.0
7.5
rated circuit voltage by more than (a) 5 percent during continuous operations or b)
10 percent during emergencies lasting not more than
15 minum.
For cables or conditions of service where mechanical s m s e s govern, such as in submarine cables or long vertical risers, the s m a l l
conductor sizesmay not be strongenough.
The insulation thicknesses apply
to aerial cablesand to single conductors installed in conduits above groundtoand
the individual
or metallicsheathovertheassembly,
with thefollowing
conductors of all multipletonductor cableshavingacommonjacket
earth burial and for all submarine cables. add
exceptions: For single-conductor cables for installation in underground ducts or direct
15 mils (0.38 + + mm) to the insulation thicknesses when such cables do not have a thermoplastic jacket or metallic sheath over the
assembly.
100 percentand 133 percent insulation levels. For 173% insulation level. consult the
The insulation thickness is adequate for both
manufacturer. Referto Table 3 - B . foomote **, for insulation level definitions.
All ac voltages are rms values.
ac spark test voltages are taken from Table34.1 of UL Standard 83, Thennoplastic Insulated Wires, loth Edition.
Single Conductor cable
in sizes 9 AWG and smallers h a l l not be used for directearth burial.
I+++
A
-H
12.0
2.4
18.0
Test
Voltage,
ac
DC
AC
Spark Test Spark test
Voltage,
Voltage,
kV
kV'+"
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
S T D a N E M A WC 5-ENGL 1992
m
6470247 0513740 553
ICEA S-61-402
NEMA WC 5-1992
Page 16
I l
I I
I I
VIVI
m m
rnrn
m m
leel
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
S T D m N E M A WC 5-ENGL 1 9 9 2
ICEA S-61-402
6470247 0513741 4 9 T
m
NEMA WC 5-1 992
Page 17
W,
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
__
~~
~
S T D - N E M A WC 5-ENGL 1992
~~~~~
6470247 0533742 326
NEMA WC 5-1992
Page 18
ICEA S-61-402
Table 3-3
CONDUCTOR SIZES, INSULATION THICKNESSES AND TEST VOLTAGES
FOR THERMOPLASTIGINSULATED SERIES LIGHTING CABLES
C h l t Voltage,
VOltsY
ConductorSize,
Test Vdtage, kV
lnsulation
Thidmess+
AWG
mils
mm
AC
DC Spark Test
Vdtage, kV
M3
POLYVINYL-CHLORIDE-INSULATED CABLES
1-5000
110
10.0
125
35.0
15513.0
3.94
POLYETHYLENE-INSULATED CABLES
11.
M14W
45
156..
55
6-4
55
1.40
217.0
.0
55
1.40
7 .O
6-4
1.65
65
1Mtt
175
0
1.90
6 4
10 90
2.29
2.
8794
110
13
8 4
150
3.81
19
2.789
3.6-4
18
84
&3000
10.0
300
O-lOOO
10-8I-t
1001-2000
24.0
8.0
2001-3000
3001-6000
6001-9ooo
...
...
...
30.0
30.0
16.5
21.0
21.0
21.0
24.O
30
I . .
...
...
...
30
35
55
*A s e p a r a t e 'acka is not required. If pro$ctors arc employed,he thickness shall be determinedby the full-load voltage. If the circuit is IDbe operated wihom
prolectors, J e thickness shall be detennrnned by hopm-arcult voltage.
tThc highest circuit voltageat u c h s u p rcprcs-ts the maximum oprating voltage ~commendcdfor that thickness of insulalion.
WSingle-conductorcables 9 AWG and smaller shall not be used for direct unh burial.
The following tabulationof series lighting transformerratings is representativeof those in commonuse**:
~
Rating,
kW
20 Ampere Secondary
6.6 Ämpom~&condary
F U U - 1 4 VdVdU,
With Protectors
Open-CirmltVd-e, V d y
Wlthout Protectors
Full-14 Vdtage Vdts,
with Protectors
Open-circuit Voltage, V d w
Wlthout Protgtors
10
1515
500
690
15
20
25
2272
2090
3090
4115
750
1020
1360
30
40
3030
1500
3787
4545
5110
6060
8180
loo0
1250
1685
2000
2700
6130
**Thisparagraph approved by NEMA as Authorized Engincenng Information.
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
NEMA WC 5-1992
Page 19
ICEA S-61-402
Table 3-4
SCHEDULE OF VOLTAGE TESTS
1. Cables Without Insulation Shield
a. 0-2000 Volts
(1) Without metallic sheath or armor
(2) With metallic sheath or armor
b. 2001-500OV01 ......................
2. Cables With Insulation Shield
a. 0-5000 Volts...................
b. 5001 volts and over
................
Assemblies of
Insulated
and
Uninsulated
SingleConductor
Assemblies of
Insulated Single
Conductors
Conductors
6.11.2 or
6.11.3 or
6.11.4a or
6.11.4b
6.11.2 or
6.11.3 or
6.11.4a or
6.11.4b
6.11.2 or
6.11.3
6.11.2 or
6.11.3
6.11.2 or
6.11.3
6.11.2 or
6.11.3
6.11.2 or
6.11.3
6.11.2 or
6.11.3
6.11.2 or
6.11.3
6.11.2 or
6.11.3
6.11.2 or
6.11.3
6.11.2 or
6.11.3
6.11.2
6.11.2
6.11.2
6.11.2 and
6.11.3
6.11.2 and
6.11.3
6.11.2
6.11.2 and
6.11.3
See Part 6 for;
6.11.2 alternating-current voltage test
6.11.3 direct-current voltage test
6.11.4a al!emating-current spark test
6.11.4b dmct-currentspark test
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
Multiple-Conductor
with
Cables
Common Covering
6.11.2 and
6.11.3
NEMA WC 5-1992
Page 20
ICEA S-61-402
Table 3-5
CONDUCTOR SIZES, INSULATION THICKNESSES AND TEST VOLTAGES
FOR POLYVINYL-CHLORIDEINYLON-INmLATEDPOWER CABLES
Test Voltage, kV, for 100 DC Spark Test AC Spark test
Insulation
Thickness
for
Volts*
Rated
Percent
Insulation
Clrcult
133
Levels**
Insulation
Levels*
for
Voltage, Phase
Conductor
Nylon***
to Phase,
Size, AWC or
kcmil
o-600
100 and
and Percent
133 Voltage,
PVC
mils
mm
18-1 6
15
0.38
14-110.38
15
10,9
20
0.51
o. 10
8-5
30
0.76
2.0
O. 13
4-2
40
1.o2
O. 15
l"4P
50
1.27
250-500
60
1.52
550-1000
70
1.78
mils
3.0
3.5
mm
AC
Voltage,
kV, kV,
and100100
forand
133
Percent
133
Percent
Insualtion
Insulation
Dc Levels Levels
1.2
o. 10
...
...
6.0
2.0
o. 10
6.0
6.0
7.5
6.0
6.0
7.5
6.0
6.0
10.0
6.0
6.0
10.0
2.5
O. 18
7.5
7.5
12.5
0.20
9.O
9.0
15.0
0.23
10.5
10.5
17.5
2.0
2.0
*The actual operating voltage shall not exceed the rated circuit voltage by more than (a) 5 percent during continous operation or (b) 10 percent during
emergencies lasting notmore than 15 minutes.
t note following Table 3-2.
**See i
***Thicknesses shown for nylon are minimum.
NOTE 1-For cables or conditions of service where mechanical stresses govern, such as long vertical risers, these minimum coductor sizes may notbe
strong enough.
NOTE? %The thicknesses given in Table
3-5 apply to single conductors installed in conduits above ground and to the individual conductors
of all
multiple-conductor cables having a common jacket or metallic sheath.
NOTE S a c voltages are r m s values.
34.1 of UL Standard 83, Thermoplastic Insulated Wires, loth Edition.
NOTE 4-ac spark test voltages are taken from Table
Notes approved as Authorized Engineering Information.
Approvedas NEMAStandard, 11-16-1969
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NEMA WC*5 92
6470247 0502762
329
ICEA S-61402
NEMA WC 5-1992
Page 21
Part 4
SHIELDING AND COVERINGS
SHIELDING (SEE APPENDIXG)
4.1 SHIELDING OF INSULATEDCABLE
Shielding of insulated cables
shall consist of a conductor
stress control layer(see2.7) and insulation shielding.
Metal tapes, wires, straps, and sheaths may be used in
combination providing they are compatible and meet the
requirements of the preceding paragraph.
Metalcomponentsembedded in a conductingnonmetallic covering shall not be exposed nor become exposed during normal installation bending(seeAppendix
4.1.1 InsulationShieldSystem
The insulation shield system shall consist of
a nonmetallic covering directly over the insulation anda nonmagH).
netic metal component directly over or embedded in the
NOTE-Additional m
d
u
c
z
a
n
c
ema be required in the metal compo?{electrical system &amqe.ristics,
nonmetalliccovering.Thenonmetalliccoveringshall
nent d ya rdt Fmgreupon
p-cu
ard installation
to the funcilonmg of overcurrent rOtectlve d e
vices, avaiablekult current and the manner in which &e system m a y
comply with 4.1.1.1. The metal component shall comply
be grounded.
with 4.1.1.2. The insulation shield system shall be resistant
4.1.2 Multiple-Conductor Cables (See4.2.)
to or protected against chemical action from other cable
When shielding is required on multipleconductor cacomponents.
bles, the shieldsshall be applied over the individual con4.1.1.1NONMETALLIC
COVERING
ductors.
A conducting nonmetallic covering which meets the r e
4.1.3 Conductor Identification ( S e e 5.5.)
quirementsof Table4-1 or Table 4-2 shall be appliedover the
4.2 SHIELDING LIMITS FOR POWER CABLE
insulation in one or more layersin direct contact andshall be
FOR FIXED LOCATIONS
plainly identified as being conducting. Identification
shall be
provided for each distinctive layer.
4.2.1 Insulation shielding shall be used
on power cables
If one of the layers is acoating,
shall be
it applied directly for fixed locations when intended for operation above the
over the insulation.
three-phase (line-to-line) operating voltages given
in Table
The tension necessary to remove an extruded covering
4-3. To obtain the equivalent three-phase voltagefor sinfrom cable at m m temperature shall be not less than 3
gle-phase or two-phase ac systems or for dc systems,
pounds(13.3N)forcablesrated2001through25,000volts
multiply the line-to-line voltage by the factors given in
and notless than 4 pounds (17.8 N) for cables rated
25,001
Table 4-3.
through 35,000 volts (seePart 6).
4.2.2 Shielding should be considered where any of the
For removabilityof insulation shields,see Appendix G,
following
conditions exists:
section G6.
1. Connections to aerial lines.
2. Transition from conductingto nonconducting envi4.1.1.2METAL
COMPONENT
ronment.
Anonmagnetic metal component consisting aoftape or
3. Transition b m moist to dry earth.
tapes, wires, straps, or sheaths shall be applied over or
4. Dry soil, such as in the desert.
embedded in the conducting nonmetallic covering. The
5. Dampconduits.
metal componentsshall be electrically continuous
throughout each cable length and shall be in contact with 4.2.3 Single-Conductor Series Lighting Cable
the nonmetallic covering. Metal components shallbe apInsulation shielding shall be used on single-conductor
plied in such a manner that electrical continuity or conti- series lighting cable when intended for operation above the
guity will not be distorted or disrupted during normal
opencircuit voltages given in Table
4-3.
installation bending(seeAppendix H).
4.2.4 Multiple-Conductor Series Lighting Cable
Metal W s ) shall be of copperat least2.5 mils (0.0635
mm) thick or of other nonmagnetic metaltape(s) having
Manufzcturet’s recommendations should be obtained for
equivalent conductance. Wires, straps, or sheaths shall be shielding limits for multipleanductor serieslighting
of copper and havea total area at any cross section ofat
least 5000 circular mils per inch(0.1 mm’/mm) of insulated conductor diameter, or of other nonmagnetic metals
having equivalent conductance.
cabel s.
COPYRIGHT National Electrical Manufacturers Association
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NEMA WC 5-1992
Page 22
ICEA S-61-402
Table 4-1
REQUIREMENTS FOR NONMETALLIC CONDUCTING COVERINGS
USlNGNONEMBEDDEDAL COMPONENTS
Aging Requirements(see 6.4taftcr air oven test at 100°C 1OC for 48 hourselongation at rupture, minimum, percent
+_
ot
6.6),
Temperature
(see
Brittleness
- 10°C"
than
Volume Resistivity,maximumatroomtemperatureandatratedtemperature+1"C(see6.9.4),ohmmeters
500
*For extruded coverings only.
4.3.4
Table 4-2
REQUIREMENTS FOR EXTRUDED NONMETALLIC CONDUCTING
COVERINGS B l N G EMBEDDED METAL COMPONENTS
Thickness,Minimum (see 6.4)
Total
with
accordance
in
Between insulation and metal component
mils
mm
5
O. 127
Physical Requirements(see 6.4)
Tensile strength, minimum
psi
MPa
Elongation at rupture, minimum, percent
Aging Requirements(see 6.4bafter air oven test at 121OC +l0C for 168hours
Tensile strength, minimum, percentage
of unaged value
Elongation at rupture, minimum, percent
Temperature
Brittleness
warmer
not (see 6.6),
1200
8.27
100
85
100
- 10°C
than
Volume Resistivity, maximum at room temperature and at rated temperature
+l0C
(see 6.9.4), ohmmeters
500
Table 4-3
OPERATING VOLTAGE LIMITS, kV, ABOVE WHICH INSULATION SHIELDING
IS REQUIRED
5
With
Power Cable-100 and 133 Percent Insulation Level
1. Single conductor (including assemblies
of single conductors)
a.
or armor
b. All others
5 kV
2kV
2. Multiple conductor with common covering
a. With discharge-resisting jacket
b. With nondischarge-resisting jacket
c. With metallic sheath or armor
5kV
2kV
5kV
Open-circuitVoltage
With Protectors
Single-conductor Series Lighting Cable
1. With discharge-resisting jacket
2. With nondischarge-resisting jacket
3. With metallic sheathor armor
Without Protectors
5kV
7kV
4kV
kV
5kV
7kV
MWTIPLYING FACTORS FOR EQUIVALENT THREE-PHASE VOLTAGES FOR
DC SYSTEMS
SINGLE- OR TWO-PHASE SYSTEM OR FOR
3
Single- and Two-phase ac Systems* over 5000 Volts
Single-and Two-phase Systems* and DC Systems
5000 Volts or Less
1
COPYRIGHT National Electrical Manufacturers Association
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One Side Grounded
Ungrounded
and
1.73
Midpoint
Grounded
~~~
STD-NEMA WC 5-ENGL
1792
6470247 0 5 3 3 7 4 3 262
ICEA-61-402
NEMA WC 5-1 992
Page 23
JACKETS
4.3
14.3.2.2 POLYETHYLENE, BLACK
General
4.3.1
Jackets shall be one of the types covered in 4.3
except that, for cable with an embedded metal
component,
the
jacket
shall
abe
nonmetallic
conducting covering meeting the requirements of Table
4-2. For jackets over metallic coverings, see4.4.
4.3.1.1 REPAIRS
The jacket may be repaired in accordance with
good
commercial
practice.
Cables
with
repaired
jackets must becapable of meeting all applicable
requirements of this standard.
4.3.2
Thermoplastic
Jackets
Thesejacketsconsist
of a moisture-resisting
thermoplasticcompoundforuse
as thecoveringor
jacket on insulated wires or cables. They shall meet
theapplicablerequirements
of 4.3.3and4.3.2.1,
4.3.2.2, or 4.3.2.3. The tests shall be made only on
jackets having a nominal wall thickness of 30 mils
(0.76 mils (0.76 m m ) or greater.
4.3.2.1 POLYVINYL CHLORIDE
This jacket shall consist of a polyvinyl chloride
compound
suitable
minimum
afor installing
temperature of -10°C (14°F).
When
tested
in
accordance with part 6 , thejacket shallmeetthe
followingrequirementsand,
when applicable,the
requirements given in 4.3.2.4.
Physical Requirements
Tensile Strength. minimum
psi
MPa
Elongation
rupture,
atminimum
percent
100
~
This jacket shall consist of a black polyethylene
compound suitable for exposure to sunlight and other
atmosphericenvironments at temperatures between
-55°C (-67'F) through 75°C (167'F), and a minimum
installing temperature of -40°C (-40°F). When tested
inaccordancewithpart
6, except that thegauge
marks shall be 1 inch(25.4
mm) apart and the
distancebetween jaws 2.5 inches (63.5 m m ) , the
jacket shallmeet the followingrequirementsand,
when applicable, the requirements given in 4.3.1.4:
Type I Polyethylene (LDPEfLLDPE), Black
Physical Requirements
Tensile Strength. minimum
psi
MPa
Elongationatrupture.minimumpercent
Base
Resin
Density
(Dz3'.
g/cm')
0.910-0.925**
Aging Requirements
Afterairoventestat
100°C+- l0C. 75
for 48 hours. tensile strength and
elongation at rupture, minimum.
percentage of unaged value
i 1°C.
30
Heat
Distortion,
100°C
maximum, percent of original thickness
Environmental
cracking*
No cracks
(ASTM D 1693)
Absorptioncoefficient.minimummilli320**
(absorbance/meter)
Type II Polyethylene (MDPE), Black
-cal
15.9
1500
10.3
Agmg Requrrements
After air oven test at 100"C+1"C. for 5 days
tensile strength, minimum, percentageof
unaged
Elongation at rupture, minimum,
percentage
60 value.
of unaged
After oil immersion at 7O"Ckl"C for 4 hours
Tensile strength, minimum, percentageof
unaged
Elongation at rupture, minimum.
value.
unaged of
percentage
distortion,
Heat
121"C+l"C,
maximum
percent of unaged value
shock.
Heat
121'C?no1"C
cracks
no 35"C+I"C
Cold bend.
80
11.7
350
Requirements
Tensile Strength. minimum
psi
I MPa
Elongationatrupture,minimumpercent350
Base
Resin
Density
(Dz3',
g/cm3)
0.926-0.940**
Aging Requirements
After air oventestat100°C i IoC,
for 48 hours, tensile strength and
elongation at rupture, minimum,
percentage of unaged value
HeatDistortion, 110°C i lac.maximum.
percent of original thickness
Environmental
cracking*
(ASTM Dl 693)
Absorption
coefficient,
minimum
milli
320**
2300
75
30
No cracks
60
50
cracks
* Use Condition B with a full strength solution of Igepal CO-630
or equivalent as defined in ASTM D1633.
** In lieu of testing finished cable jackets, a certification by the
manufacturer of the polyethylene compound that this
requirement has been complied with shall suffice.
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
ICEA S-61-402
NEMA WC 5-1992
Page 23A
Type 111 Polyethylene (HDPE), Black
Physical Requirements
Tensile Strength,minimum
psi
MPa
Elongation at rupture, minimum percent
Base Resin Density (D%, @cm3>
Aging Requirements
M e r air oven test at 100°C f l0C, for 48
hours, tensilestrength and elongation at
rupture, minimum, percentage of unaged
I
2500
17.2
350
0.941-0.965**
75
Heat Distortion. 1 10°C k l0C. maximum, 30
percent
value of original thickness
Environmental cracking*
No cracks
(ASTM D 1693)
Absorption
coefficient,
minimum
milli
320**
(absorbancefmeter)
*
Use
condition
B with a full strength solution of Igepal
C0430 or quivalent as defined in A S m D1693.
** In lieu of testingfinishedcablejackets,
a certification by
the manufactum of the polyethylene compound that this
"
requirement has been compiled with shall
suffice.
4.3.2.3 CHLORINATED POLYETHYLENE,
THERMOPLASTIC
This jacket shall consist of a thermoplastic
chlorinated polyethylene compound. W h e n tested in
accordance with part 6, the jacket shall meetthe
following requirementsand,
when applicable, the
requirements in4.3.2.2.4:
Physical Requirements
Tensile Strength,minimum
I
1400
psi
MPa
Tensile stress at100percentelongation
minimum
psi
I MPa
Elongationatrupture,minimum,percent
350
lo00
150
Aping Requirements
Table continued, page 24
COPYRIGHT National Electrical Manufacturers Association
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65
65
65
STD-NEMA WC 5-ENGL
1992
NEMA WC 5-1992
Page 24
ICEA S-61402
After air oven test at 121'Ckl'C for1 6 8 hours
Tensile smngth. minimum, percentageof
unaged
Elongation at rupture, minimum,
50 ofvalue
unaged
percentage
After oil immersion at lWC+l'C for 18housTensile s m g t h and elongation at
xupture,minimuin, prcentage of unaged value
Heat distortion, 121'(31'C,maximum,percent25
-35'CCl'C
bend, Cold
4.3.2.4.2 U-bendDischarge
There shall be no cable failuresnor cracksin the jacket.
4.3.3Jacket Thickness
The average thicknessof a jacket shallbe not less than
the appIicable value given
in Tables 4-4,4-5,445, and 4-7.
For the jacket thickness
of cablesnot shown in these tables,
see Table 4-8. The minimum thickness shall be not less
than 80 percent of the applicable value given in these
tables. (See 6.4 for method
of measurements.)
60
4.3.4SeparatorUnderJacket
If used, a separatorshall consist of a material which is
compatible with the other components
of the cable.
no cracks
4.3.2.4 DISCHARGE-RESISTINGJACKETS
The jackets described in 4.3.2.1. 4.3.2.2, and 4.3.2.3,
when used on single-conductor nonshielded cablesrated
2001 through 5000 volts phase to phase (see Table4-3),
shallmeetthefollowingadditionalrequirementswhen
tested in accordance with Part 6.
samples are selected and
IrregularityInspection of Jacketsover
Metallic Shielded Power Cable
Jackets shall not have irregularitiesas determined
by the procedure of ICEA T-27-581. The method to
be used are:
4.3.5
4.3.2.4.1 Specific Surface Resistivity
The specific surface resistivity shall be not less than
200.000 megohms.
Method C
Method B
Chlorinated Polyethylene Polyvinyl Chloride (4.3.2.1)
Thermoplastic (4.3.2.3) Polyethylene (4.3.2.2)
Table 4-4
SINGLE-CONDUCTOR POLYETHYLENE-INSULATED NONSHIELDEDC A B L E 4 5 0 0 0 VOLTS
(For All Uses: Conduit, Trays, Troughs, Underground Duct, Aerial
and Direct Burial")
Jacket Thickness
Conductor Size,
AWC or kcrnil
14
12
10
9
8
6
4
2
1
110
0 4 0 0 volts
15
15
15
15
601-2000
mils
mm
15
0.38
0.38
0.38
0.38
0.38
15
15
30
30 30
30 30
210
3/0
410
250
300
45 45
45 45
45
350
400
450
500
600
65
65
1.65
65 65
65
1.65
mils
mm
0.38
0.38
0.38
0.38
...
...
...
...
...
0.76 0.38
30
0.76 0.76
0.76
0.76
1.14
1.14
30
45
45
45
45
1.14
1.14
1.14
1.14
1.14
1.14
1.14
1.65
1.65
45
65
1.14
1.65
65
65
1.65
1.65
1.65
1.65
1.65
1.65
1.65
65
1.65
65
65
65
1.65
1.65
1.65
15
45
45
1.14
1.14
1.14
1.65
1.65
65
1.65
1.65
1.65
1.65
1.65
65
65 65
65
65
65
2001-5000 Vdts.
mm
mils
0.76
0.76
0.76
1.14
1.14
45
volts
45
65
1.65 750
65
65
1.65
65
65
lo00
1.65 1.65
65
1.65
65
For single-conductorpolyvinylchloride-insulatednonshielded cable,see Table 4-8, Column 1.
*Sec 4.1 and 4.2 for shielding requirements.
**Single-conductor cablesin sizes 9 AWG and smaller shallnot be used for direct canh burial.
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
...
...
...
1.65
~~
NEMA WC*5
92
= 6470247
0502766T74
W
ICEA S-61402
NEMA W C 5-1992
Page 25
0 0 0 0 0
0000000000
222
d
d
d
i52
224
i52 %%52%%
E
E
m
.:
:s 8 8 8 8 8
. W
.a
E
i i52
1
i52s
m
.a
E
E
0 0 0 0 0
0000000000
' O 0
0 0 0 0 0
:o000
i33352
0000000000
0 0 0 0 0
0000000000
E
E
m
.a
-
I
E
88888
P i P i P i P i P iP i P i P i P i P i
E
E
v)
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a
4
0 0 0 0 0
\o00000000
Q
2
m
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
d
&
NEMA WC 5-1992
Page 26
ICEA S-61-402
4.4.2 General
4.4.2.1 UNUSUALCONDITIONS
The standards given in this section apply under usual
installation, operating and service conditions. WhereunCalculated Diameter of Individual
Jacket Thidmess
usual installation, operating or service conditions exist,
Conductor Under Jacket
modifications may be necessary andtheseconditions
mm
inches
mus+
mm
should be defined before cable design
is completed.
0.250 or less
6.35 or less
15
0.38
4.4.2.2 TYPES OF METALLIC COVERINGS
The types and conditionsof installation are as follows:
0.251-0.425
6.38-10.80
25
0.64
a. Metallic sheath, lead or aluminum
0.426-0.700
10.82-17.78
30
0.76
1. Conduit, ducts, troughs or raceways
2.
Suspended from aerial messenger
0.701-1.500
17.81-38.10
50
1.27
3. Where protected by metal armor
or nonmetallic
1.501-2.500
38.13-63.50
80
2.03
coverings for other types of installation
*These thicknessesa ly to jackets onl and do not apply to colored
b. Flat metal tape armor
coatings on the. indivzal conducton ormultple-conductor cables.
1. Direct burial in trenches
2. Suspended from aerial messenger
Table 4-7
Plain or galvanized-steel tape armor, depending upon
COMMON OVERALL JACKETOF
soil and water conditions,with an outer fibrous covering
MULTIPLE-CONDUmOR CABLES
(FOR ALL VOLTAGES AND ALL USES)
is for use on cables for direct burial and for shaft installabe clamped at intervals.
tions
where the cable can
Calculated Diameter of Cable Under Jacket Jacket Thidmess
Galvanized-steel tape armor without an outer fibrous
inches
mm
mils
mm
aerial
covering is for use on cablesto be suspended from an
messenger strand.
0.425 or less
10.80 or less
45
1.14
c. Interlocked metal tape armor*
60
1.52
0.426-0.700
10.82-17.78
1. Direct burial in trenches
0.701-1.500
17.81-38.10
80
2.03
2. Troughs
3. Racks
110 2.79
1.501-2.500
38.13-63.50
4. Raceways
larger
63.53 and
larger
140 3.56
2.501 and
5. Suspended from aerial messenger
NOTE 1-Table 4-7a lies to all round multiple-conductor cables
Interlocked-metal tape armor withoutan outer covering
having a common ove% jacket.
but with either a fibrous bedding
or a thermoplastic jacket
NOTE >For flat twin cable.use the calculahzd major core diameter
under the jacket to determine the jacket thickness.
under the armor
is for cables for indoor
use and foroutdoor
aerial service.
4.4 METALLICANDASSOCIATED COVERINGS
Interlocked-metaltape armor with either fai h u s bedding
4.4.1 Scope
or a thermoplastic jacket under the armor and either
a
The following itemsare covered in 4.4:
fibrous coveringor a thermoplasticjacket over the arma
Division I. (See 4.4.3 through 4.4.15.) Materials, conis for underground installations.
structions and requirements for metallic and associated
d. Galvanized steel wire m o r
coverings recommended foruse under normal conditions
1. Submarinecable
of installation, operation and maintenance
of power, con2. Dredgecable
trol, and lighting circuit wires and cables. It also covers
3. Vertical riser, borehole, and shaft cable for end
submarine cables.
suspension
Division II. (See 4.4.16 through 4.4.22.) Round wire
4. Direct burial in trenches and subjected to unarmor for borehole, dredge, shaft, and vertical riser cable.
usual longitudinalstress
Division III. ( S e e 4.4.23 through 4.4.25.) Round wire
Jute coveringis not requiredon dredge and vertical
riser
armor for buried cable.
cable. It is required on submarine, borehole, and shaft
The requirements of Division I as pertaining to quality of
cablewheresevereinstallationandserviceconditions
materials, design and construction apply also
to Divisions II
exist, It is required for direct burial cable.
and III, except as to particular details expresslyset forth in
Jute coveringmay be desirable where the conditions
of
the followingsectionsor as otherwise modified.
transportation require protection
for the galvanizingon the
armor wires.
Table 4-6
INDIVIDUAL CONDUCTORSOF
MULTIPLE-CONDUCTOR CABLES
UNDER A COMMON COVERING
*Interlocked steel tape armor used for service entrance cable or for
buildm cable such astypes AC, ACT. ACL,and ACV is not within the
scope o$ these standards.
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-
S T D = N E M A WC 5-ENGL 3992
6470247
0533747
908
ICEA s-61-402
NEMA WC 51992
Page 27
DNlSlON I
MnALLIC AND ASSOCIATED COVERINGSFOR
INSULATED CABLES
4.4.3 scope
Division I applies to the metallic coverings described
in
the following sections,together with the necessary
fibrous
or thermoplastic beddings and protectivecoverings: to
nonmetaIlic Coverings over metaIIic s h e a t h ; and to their
application overinsulated electric cablefor use on power,
control, and lighting circuits.
4.4.4 Metallic Sheath
A lead of smooth aluminum sheathshall be used with or
withoutsupplementaryprotectionwhen
an impervious
covering is required.
4.4.4.1 TYPE OF LEAD
A sheath of commercially pure lead (or an alloyed lead)
shall be tightly formed around the core of the able. This
lead shallmeet the requirementsof ASTM B 29.
If lead smpped from new cable is used it shall compiy
with the requirements given herein.
4.4.4.2 THICKNESS OF LEAD
Theaveragethicknessofthesheathshallbeinaccotdance
with Table 4-9. 'Ihe minimum thickness shall in no case be
lessthan90~ercentofthethicknessspecifiedinthetable.
Where protective jackets are used ova the lead sheath, see
4.4.15.6 for the thickness of the lead sheath.
There are special caseswhere the above t h i c k n e s s e s may
require an increase, especially on the smallersizesof cable,
if several cables are to be pulled in together in one ducf if
the sections are extra long: or if the handling is severe oc
awkward during installation
as in some transformex vaults.
Table 4-8
SINGLE- AND MULTIPLE-CONDUCTORWIRES AND CABLES
(ALL USES EXCEPT COMMUNICATION AND PORTABLE CABLES*)
o m or less
635 or less0.38
15
45
0.38
1.14
15
0.251-0.425
6.35-10.80 0.76
30
45
1.14
25
0.4264.700
10.82-17.781.14
45
60
0.76
152
30
0.701-1.500
17.81-38.101.65
65
80
2.03
50
1501-2500
38.1263502.41
95
110
2.79
356
2.501 a n d h e r
6353 and h
e
r
1403.18125
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
45
1.14
45
1.14
60
1.52
1.27
80
203
80
2.03
110
279
...
...
3.56140
0.64
NEMA WC 51992
Page 28
0-0.425
0.426-0.700
0.701-1.050
1.O5 1-1 500
1501-2.000
ICEA S-61-402
0-10.80
10.82-17.78
17.81-26.67
45**
65**
80
95
110
125
140
26.70-38.10
2.001-3.000
38.13-50.80
50.83-76.20
3.001 a n d h e r
7623 a n d h e r
~~
~~
1.14
1.65
2.03
2.41
2.79
3.18
356
~~
*The thiclolu! of l a d !huh for flu twin cable shall k h& on rhc
ulducd mrpr com dumau.
**For mhnarine ubla rbe thickness of the l u d sheath for the fim
two COIC d i m u e r durhurions dull h80 mils @
U
3mm).
4.4.43
MEASUREMENT
OF
THICKNESS OF
LEAD
Thethicknessshallbemeas~inaccordancewith6.8.
4.4.4.4 REAPPLICATION OF LEAD SHEATHS
When the sheath does not meet the requirements
of thesestandards.itshallnot
be repaired,butthe
leadmaybe stnpped from theentirelength of the
cable and the cable releaded.
4.4.4.5 TYPE OF ALUMINUM
A anooth sheath of aluminum alloy 1060,135O,or equiva
lent shall be tightly formed mund the core of the cable.
4.4.4.6 THICKNESS OF ALUMINUM
The average thicknessof the aluminum sheath shall be
in accordance with Table 4-10. The minimum thickness
shallinnocasebelessthan90percentofthethickness
specified in the table.
Table 4-1O
THICKNESS O f SMOOTH ALUMINUM SHEATH
CJahted Diamete olCorc.
-6
04.400
0.40 1-0.740
0.741-1.050
1.051-1.300
1.301-1550
1551-1.800
1.801-2.050
2.05 1-2.300
2.301-2.550
255 1-2.800
mm
ThkkneSsdSbt.th
mPs
040.16 0.89 35
10.19-18.801.14 45
18.82-26.671.40 55
26.70-33.021.65 65
33.05-39.371.90 75
39.4045.72
85
45.75-52.07
95
105
52.10-58.42
58.4544.77
115
64.8CL71.12
125
mm
71.15-77.47
7750-83.82
83.8540.17
902046.52
9655-102.9
2.801-3.050
3.051-3.300
3.301-3550
3551-3.800
3.8014.050
3.43 135
3.68 145
3.94 155
4.19165
4.45 175
~~
*'lhe thicLnar of the alllminum &th
for flu twin &e
bucd ao the criculated m p r core d i m e r .
d u l l bc
MEASUREMENT OF THICKNESS OF
ALUMINUM
The thickness shall be measured inaccordance with 6.8.
4.4.4.7
R E A P P L I C A T I O N OF A L U M I N U M
SHEATHS
When thesheath does not meet therequirements
of these
standards, it shall not be repaired,but the aluminum may
be stripped from the entirelength of the cableand the cable
4.4.4.8
resheathed.
4.4.5 Protective Jackets
See 4.4.15.
4.4.6
4.4.6.1
Flat Metal Tape Amor
SCOPE
This section coversplain and zinccoated flat steel strip
in coils for use as flat armar for electrical cables.The zinc
coating shall be applied by either thehot-dip a the electro-galvanizing process such that dl surfaces of the fmished tape width are coated,including edges.
4.4.6.2 TENSILE STRENGTH AND ELONGATION
The plain and zinccoated strip shall have a tensiie
0
o
,O
O psi (276 MPa) nor m m
strength of not less than 4
than 70,000 psi (482 MPa). The tensilestrength shall be
determined on longitudinal specimens consisting of the
full width of the strip when practicaI or on a straight
specimen slit h m the centerof the strip. The strip shall
have an elongationof not lessthan 10percent in 10 inches
(254mm).' h e elongation shall be the permanent increase
in length of a marked section of the strip, originally 10
inches (254 mm) in length, and shall be determined after
thespecimenhasfractumLAlltestsshallbernadepriorto
application of the strip to the cable.
4.4.6.3
2.16
2.41
2.67
2.92
3.18
GALVANIZING TEST
4.4.6.3.1 Weight of Zinc Coating
The weight of zinc coating shall be determined before
appIication of the strip to the cable. Thestrip shall have a
minimum weightof coating of 0.35 ounce per quart foot
(106.8 g r a m s h e d of exposed surface. ?he weight of
coating specified is the total amount onboth surfaces and
edges, and shall be determined in accordance with the
method described in AST" A 90.(See Appendix E)
The zinc coating
fernain adherent without flaking
or spalling when the strip is subjected to a 1€@degree bend
,shall
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
NEMA WC85 9 2
6470247
0502770
4T5
ICEA S-61-402
NEMA WC 5-1992
Page 29
over a mandrel !4 inch (3.18mm) in diameter. The zinc
coating shall be considered
as meeting this requirement
if,
when the strip is bent around the specified mandrel, the
coating does not flake
and none ofit canbe removed from
the strip by rubbing with the fingers.
Loosening or detachment during the adherence test of
superficial, small particles of zinc formed by mechanical
polishing of the surface of the zinc-coated strip shall not
constitute failure.
4.4.6.4 WIDTH
The nominal width of metal tapes shall be not greater
than that s p e c i f i e d in Table4-11.
Por nominal widths LOO0 inch (25.4mm) or less, the
tolerance in width shall be k 30 mils. For nominal widths
greater than 1.000inch (25.4mm), the tolerance in width
shall be 9 45 mils.
4.4.6.5 MICKNESS
The nominal thickness of metal shall
tapebe not lessthan
thatgiveninTable4-12.See6.8.2formethodofmeasuring
Table 4-12
THICKNESS OF METAL TAPEFOR FIAT
ARMOR (PLAIN OR ZINC COATED)
Calculated Diameter of Cable
under Jute Bedding+
inches
mm
1 .000or less 25.40 or less
1.001 or larger 25.43or larger
Nominal Thidcnm
d Metal 'hpe
mUrr
mm
0.5120
30
0.76
*For flat twin cable, the nominal thickness shall be.based m the c a l c u lated majorcore diameter.
4.4.6.6 APPLICATION, LAY, AND SPACING
' h o metal t
a
p shall be applied helically in the same
direction over the jute bedding except that they may be
applied in opposite directions where the total
area of the
conductors is less than 50,000circular mils(25.34mm?.
The directionof lay of the innertape shall be opposite to
that of the jute bedding. When applied in the same
direction as the innertape,the outer tape shall be approximately
centered over thespaces between the convolutions of the
inner
The maximum space between turns shall not
exceed 20 percent of the width of the tape or 0.200inch
(5.08mm), whichever is the
During or prior
to application, thetapes shall be flushed
with a suitable compoundto deter corrosion.
tape.
metal tape thickness.
greater.
The tolerance in the nominal thicknessboth
of plain and
zinc-coated tape shall be 3 mils.
The zinccoated tape shall not at any place be more
than
20 percent thickerthan the stripped tape thickness, which 4.4.7 Interlocked Metal Tape Armor
should be the specified nominal thickness for bare metal. 4.4.7.1 SCOPE
The tolerance for nominal thickness
of bare metal should
This section coversflat metallic strip-in coils foruse as
tape.
apply to the stripped
interlocking armor for electrical cables.All tests shall be
made priorto the applicationof the strip to the cable.
Table 4-11
WIDTH OF METAL TAPEFOR FLAT ARMOR
4.4.7.2 STEEL TAPE
(PLAIN OR ZINC COATED)
Steel tape (exceptstainless) without a protective coverCalculated
Dlameter
of Cable
Nominal WMth of
ing
shallbe zinccoated. The zinc coating shall
be applied
under Jute Bedding+
Metal %
p
e
by either the hot-dip or the electro-galvanizing process
inches
mm
inches
mm
such that all surfaces of the finished tapeare
width
coated,
0.450or less 11.43 or less
0.7
15
90
.0
including the edges. If an outer jute or other protective
covering is furnished, plain steel tape may be used. The
0.451-1.000
11.46-25.40
1.02050.4
quality of thesteeltapeandtherequirementsforthe
1.001-1.4
20
50
.43-35.56
1.23510.8
galvanizing shallbe those specifiedin 4.4.6.2 and 4.4.6.3
for flat steel tape.
1.401-2.000
35.59-50.80
1.500 38.1
+
2.001-3.500
50.83-88.90
3.501 or larger 88.93or larger
2.05000.8
3.000
76.2
*For flat twin cable, the nominal width shall be based on the calculated
major core diameter.
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
4.4.7.3 WIDTH
The nominal width of metal tape may be lessthan but
shall not be greater than that specified in Table
4-13.
For any width of metaltape used, the tolerancein width
shall be +10 mils or-5 mils, exceptfor aluminum which
shall be +10 mils.
NEMA WC 5-1992
Page 30
ICEA S-61402
Table 4-13
WIDTH OF METAL TAPEFOR
INTERLOCKED ARMOR
Calculated Diameter of
Cable under Armor
inches
mm
Table 4-14
THICKNESS OF METAL TAPEFOR
INTERLOCKED ARMOR
Nominal Width of
Metal Pape Armor
inches
Nominal Thickness
Calculated Diameter of
Cable Under Armor
mm
Ambrae,Brass, Steel,
stalnlm
Pnd Monel ~~e
Aluminum
9nd Zinc
w e
12.7
0.500
or
12.70
less or
0.500
less
0.64
25 0.510-1.500
0-38.10
20
0.750 12.730.501-1.000
25.40
1.501and38.13and
25 larger
larger
0.875 25.431.001-2.000
50.80
2.001
larger
and
50.83
and
4.4.8
1.OOO
0.64
30 0.76
Continuously Corrugated Metal Armor
25.4
4.4.8.1 SCOPE
This section covers the requirements applicable
to continuously
corrugated
metal
armored
cable.
The
metal
ar4.4.7.4 THICKNESS
mor
is
formed
by
a flat metal tape which is longitudinally
The nominal thickness of metal
tape shall be not lessthan
folded around the cable core,
seam welded, and corrugated
that given in Table4-14. See 6.8.2 for method of measuring
or by applying over the cable core a seamless sheath or
metal tape thickness.
tube which is then corrugated.
The tolerance in nominal thickness of the tape shall be
& 3 mils. The zinc-coated
tape shall not,
any place, be more 4.4.8.2 TYPE OF METAL
than 20 percent thicker than the stripped tape thickness,
4.4.8.2.1 When metal armor is formed by a flat metal
which should be the specified nominal thickness for bare
tape, the tapes used shall be aluminum, copper, steel, or
metal. The tolerance for nominal thickness of bare metal
alloys
thereof.
should apply to the stripped tape.
larger
4.4.8.2.2 When metal armor is formed by applying a
4.4.7.5 NONMAGNETIC TAPE
seamless sheath ortube,the metalshall be aluminum or an
Whennonmagnetic tapes such as aluminum,brass,
aluminum
alloy.
bronze, zinc, or
stainless steel are used, the widths shall be
in accordance with 4.4.7.3 and the thicknesses in accord4.4.8.2.3 The minimum thickness tof
ape or of the sheath
ance with 4.4.7.4.
or tube before corrugation shall
be as shown in Table 4-15.
Representative values
of tensile strengthand elongation for
the nonmagnetic metalsare given in Appendix B.
4.4.8.3 FLEXIBILITY
4.4.8.3.1 The armored cable shall be capable of being
bent around a mandrel having a diameter of 14 times the
cablediameter.Thearmor
shall shownoevidence of
Table 4-15
MINIMUM THICKNESSOF METAL FOR CORRUGATEDARMOR
Diameter
Calculated
Inches
of Cable Under Armor
mm
0-2.180
2.181-3.190
3.190-4.200
0-55.37
55.40-81.O3
81.05-106.7
0-2.365
2.363.545
3.546-4.200
0-60.7
60.10-90.4
90.07-106.7
0-1.905
1.906-3.05
3.051-4.200
0-48.39
48.41-72.39
72.42-106.7
copper
AlUminUm
mils
mm
mils
22
29
34
0.56
O. 74
0.86
...
a..
...
...
...
...
...
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
...
...
a..
Steel
mmmm
mils
...
...
...
...
...
...
17
21
25
0.43
0.53
0.64
...
...
...
...
...
...
...
...
...
...
...
...
...
16
20
%I
...
...
a..
...
...
...
0.41
0.51
0.61
NEMA WC*5 92 W 611702L17 0 5 0 2 7 7 2 2 7 8 W
ICEA S-61402
NEMA WC 5-1992
Page 31
fracture visible to the unaided eye. The test shall
be conducted in accordance with the procedure givenPart
in 6.
4.4.8.3.2 CorrosionProtection
4.4.8.3.3 When required a corrosion protective covering
shall be applied over the armor.
4.4.9 Galvanized Steel
Wire Armor
4.4.9.2.3 TORSIONTEST
The zinc-coated wire shall withstand, without fracture,
the minimum number of twists specified in Table 4-16.
This test shall be made
on a sampleof wire having an initial
length of 6 inches (152 mm) between jaws of a standard
torsion machine or equivalent with one head of the machine movable horizontally. The effective
s@ of rotation
shall not exceed60 rpm.
Table 4-16
NUMBER OF TWISTS (TORSION TEST)
4.4.9.1 SCOPE
This section covers zinc-coated low-carbon-steel wire
for use in the armoring of borehole, vertical riser, submarine, and underground cables used for power, control, and
lighting circuits for normal
use. For wire armor for special
uses see Divisions II and III. All tests shallbe made prior
to applicationof the wireto the cable.
4.4.9.2 TENSILESTRENGTH,ELONGATION,
AND TORSION
The zinc-coatedwire shall be uniform in diameter and
free from cracks, splints, or other flaws.
4.4.9.2.1 TENSILESTRENGTH
The zinc-coated wire shall have a tensile strength
of not
less than 50,000 psi (345 h4Pa) and not morethan 70,000
psi (482 m a ) . The tensile strength shall be testedin
accordance withASTM E 8. (See AppendixE.)
4.4.9.2.2 ELONGATION
The zinc-coated wire shall an
have
elongationof not less
than 10 percent in 10 inches (254 mm). The elongation
shall be the permanent increase in length of a marked
section of the wire originally
10 inches (254 mm) in length
and shallbe determined after the specimen has fractured.
Nominal
Wire
Diameter
Minimum Number
of Twists
mils
mm
238-166
6.05-4.22
7
165-1 10
4.19-2.79
10
109-65
14
2.77-1.65
4.4.9.3 GALVANIZING TESTS
4.4.9.3.1 Weight of Zinc Coating
The weight of zinc coating shallbe determined before
the wire is applied to the cable. The wire shall have a
minimum weight of coating per square foot of uncoated
wire surface inaccordancewithTable 4-17. The zinc
coating shall be tested for weight by a stripping test in
accordance withASTM A 90. ( S e e Appendix E.)
4.4.9.3.2 Adherence of Coating
The zinc coating shall remain adherent when the iswire
wrapped at a rateof not morethan fifteen turns per minute
in a closed helixof at least twoturns around a cylindrical
4-18. The zinc
mandrel of the diameter specified in Table
coating shallbe considered as meeting this requirement
if,
when the wireis wrapped about the specified mandrel, the
Table 4-17
MINIMUM WEIGHTS OF ZINC COATING
Nominal Diameter of
Weight
Minimum
BWG WireCoated
mllS
size,
of Zinc Coating
mm
Ounces per Square Foot of
Exposed Wiresurface
Grams per Meter2 of
Exposed Wire Surface
238
4
1.o0
305
5.59
220
5
1.o0
305
5.16
203
6
1.o0
305
0.90
2.77
2.11
275165
4.19
8
134
3.40
10
109
18383
12
14
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
0.60
NEMA WCXS 92 H 6470247 0502773 L04
NEMA WC 5-1992
ICEA S-61-402
Page 32
coating does not flake and none
of it can be removed from
the wire by rubbing it with the fingers.
Loosening of detachment during the adherence testof
superficial, small particlesof zinc formed by mechanical
polishing of thesurface of zinc-coatedwireshallnot
constitute failure.
Table 4-18
MANDREL DIAMETER FOR
ADHERENCE OF CQATING TESTS
WireDiameter
Mandrel
Diameter
mm
mils
238-134
6.05-3.40
3 times wire
diameter
133 & smaller 3.38 & smaller 2 times wire diameter
4.4.10 Jute Bedding for Armored Cable
See 4.4.11 for Interlocked Armored Cable.
4.4.10.1 APPLICATION
Metallic-sheathed cable to be armored shall be served
with a bedding of impregnated
jute yam or roving. If the
cable is without metallic sheath, the core shall
be covered
as specified in 4.4.12. In no event shall the metallic sheath
or the core without metallic sheath be run through hot
asphalt ortar compound.
4.4.10.2 DIRECTION OF LAY
The directionof lay of the jute bedding or serving shall
be opposite to that of the armor directly in contact with it,
except as allowed in4.4.9.6. Adjacent layersof jute shall
be applied with opposite directions
of lay.
4.4.9.4 Size of Armor
Thesizes of armorwireforDivisionIapplications
including submarine cables are given
in Table 4-19.
4.4.10.3 THICKNESS (See Part 6.)
Ifthe servicerequirements are exceptionallysevere,
The thickness of jute bedding under the armor in the
larger sizesof armor wiremay be required.
finished cable shall
be not less thanthat specified in Table
The tolerancein diameter for galvanized steel wire shall 4-21.
be as shown in Table4-20.
4.4.11 Jute Serving Overall for Armored Cable
4.4.9.5 LAY
See 4.4.12 for Interlocked Armored Cable.
The length of lay of the armor wirebeshall
not less than
seven nor morethan twelve times their pitch diameter for 4.4.11.1 APPLICATION
When an outerjute serving is required, the armored cable
all constructions except for dredge cable. For dredge cable,
or tar compound,then
shall first be run through hot asphalt
see 4.4.20.3.
served witha layer of number sixteen three-ply
(No. 16/3)
“Lay” is defined as follows. “The lay of any helical
impregnatedjute yam applied with a short close lay, again
element of a cable is the axial length
of it turn of the helix
run through hot asphalt ortar compound and finishedby
of that element.”
running through some suitable material which will prevent
4.4.9.6 DIRECTION OF LAY
sticking of adjacent turns of the cable when wound on a
Successive layers of jute andarmorshall be laidin
reel.
opposite directions. The direction
of lay of
the armor wires
4.4.11.2 DIRECTION OF LAY
shall be so chosen that birdcaging of the cable being
The directionof lay of the jute serving shallbe opposite
armored shallbe reduced to a minimum.
to thatof the armor in contact with it.
Table 4-19
SIZE OF GALVANIZED STEEL ARMOR WIREFOR DIVISION I APPLICATIONS
DU L C ;
Calculated
Diameter
of Cable
Under
Bedding
Jute
Nominal
inches
less
0.750 or
mils
less
S i z e of Armor
Wire
BWC
mm
19.05 or2.77
109
mm
12
8-25.40
0.751-1.000
3.40
10
134
3-43.18
1.001-1.700
4.19
8
165
5.16
6
203
500
1.70
larger2.501 and
larger63.53 and
COPYRIGHT National Electrical Manufacturers Association
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4
-6.05
238
ICEA-61-402
NEMA WC 5-1992
Page 33
Table 4-20
TOLERANCES IN DIAMETER
Nominal
Diameter of Coated Wire
4.4.1 4.2 INTERLOCKED ARMOR
Interlocked armor shall be applied dxectly over the
covering, no bedding being necessary.
Tderancg. inches
mils
mm
238-166
6.05422
ko.005
165-1 O9
4.20-2.77
Lo.004
108-65 Lo.003
2.74-1.65
4.4.14.3 ROUND WIRE ARMOR
Where round wirearmor is used, a jute beddmg shallbe
applied over the jacket before application
of the armor.The
thickness of the jute bedding shallbe in accordance with
Table 4-21. (See Part 6.)
4.4.15 Thermoplastic Jacket Over Metallic
Sheath
4.4.12 Jute for Interlocked Armored Cable
4.4.12.1 JUTE BEDDING
If jute bedding is required, the application and direction4.4.15.1 THERMOPLASTIC JACKETS
Thermoplastic jackets, when used, shall be extruded
of lay shall be in accordance with 4.4.10.1 and 4.4.10.2.
over
the metallic sheath and shall
fit tightly thereto.They
The thickness shallbe as specified for metal taped cable in
shall
be
either:
Table 4-21. (See Part 6.)
1. Polyvinyl chloride meeting the requirements given
4.4.12.2 JUTE SERVING OVERALL
in 4.3.2.1, except that the cold bend requirements
shall be given in 4.4.15.4, or
If jute serving overallis required, it shallbe in accordance with 4.4.11.
2. Black polyethylene meeting the requirementsgiven
in 4.3.2.2, or
4.4.13 Core Covering for Nonsheathed and
3.
Black
chlorinated polyethylene meeting the requireNonjacketed Cable with Metallic Armor
mentsgiven in 4.3.2.3 except that the cold bend
Over the core
of nonsheathed and nonjacketed cable with
requirements shallbe as given in 4.4.15.4.
metallic armor, there shallbe applied tape, fibrous coverTape shall
ing, jute,or other suitable protective covering.
4.4.15.2 THICKNESS
be used over cores havinga diameter of 0.300 inch (7.62
The average thicknessof the thermoplastic jacket shall
mm) or larger.
be not less than that specified in Table 4-22. The minimum
thickness shall be not less than 70 percent of the values
4.4.14 Core Covering for Jacketed Cable Under
of the jacket shall
given
in the table.
The average thickness
Amor
be taken as one-half the differencein diamerers over and
4.4.14.1 FLAT STEEL TAPE ARMOR
under the jacket
as determined by circumference measureWhere aflat steel tape m o r is used, a jute bedding shall men&. (SeePan 6.)
be applied over thejacket before applicationof the amor.
The thickness of the jute bedding shall be in accordance
with Table4-21. (SeePart 6.)
Table 4-21
THICKNESS OF JUTE BEDDING FOR ARMORED CABLE
Calculated Dinmeter of Cable
Under Jute Bedding,
Minimum Thickness of Jute Bedding
Round W h Armored Cable
Metal 'lhped
Sheathed or Jacketed
inches
mm
0.450 or less
11.43 or less
0.451-0.750
11.46-19.05
1.1445 1.14 2.03 45
0.751-1.000
19.08-25.40
1.1445
65
1.001-2.500
25.43-63.50
65
2.03
1.65 2.7980
1.65 65
95
larger
and
2.501
63.53
larger
and
mils
mm
mils
2.03 45
0.76
30
mm
mils
1.14
80
mm
80
1.65
95
110
2.4 1
'The t h i c k n e s s of jute bcdding for flat twin cable shall be based on the calculated major core dtameter.
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
Nonsheathed or Pionjacketed
3.18 125
2.4 1
NEMA WC 51992
Page 34
ICEA S-61402
Table 4-22
THICKNESS OF THERMOPLASTIC
JACKET OVF,RMETALLIC SHEATH
Cdcuhtrd Dlameta Over Sheath
Thlcknts of Jacket
i C b a
mm
mb
mm
0.750 or less
0.751-1.500
19.05 or less
50
1948-38.10
38.13-57.15
65
80
1.27
1.65
2.03
57.18-76.20
2.41 95
1501-2.250
2.251-3.000
3.001 and
larger
76.23 and larger
110
2.79
4.4.15.3 TIGHTNESS OF APPLICATION OF POLYETHYLENE JACKETTO SHEATH
Thejacket shall be removed for5 inches (127 mm) fmm
each end ofa 12-inch (305 mm)sample of cable, leaving
a 2-inch (50.8-mm) ring intact and undisturbed
at the
center. The sample
shall then be inserted vertically
in a hole
in a flat rigid plate which is at least 10 mils (0.254mm)
larger than the diameter over the sheath but not over 40
mils (1.02 mm)larger.No movement of the 2-inch(50.8mm) ring shall takeplace withina period of 1 minute when
weight is applied to the upper end of the sample. The
weight to be applied shall be equal to 10 pounds per inch
(1.77 kNh)of outside diameter of the metallic sheath
minus the weight of them
aml sample, rounded off to
the nearer halfpound.
4.4.15.4 COLD BEND
When q
u
i
m
i
,the manufacturershall submit evidence
that the jacket has been tested on similar cable andmeets
the following requirement. The jacketed cable shall be
subjected to the Same bend test and with the same frequency ase
r
q
dfor thc underlying con.The test temperaupeshall be minus 1O'C or colder. After the final bend,
the jacket shall shownocracksvisible
to thenormal
unaided eye.(See Part 6.)
4.4.15.5 IRREGULARITY INSPECTION
Jackets shall not have irregularities as determined
by the procedure of ICEA T-27-581. The methods to
be used are:
Method B
Method C
Chlorinated
Polyethylene
Polyvinyl-Chloride
Thmopktic
Polyethylene
4.4.15.6 THICKNESS OF LEAD SHEATH
When a thermoplasticjacketisappliedover
a lead
sheath, the average thickness
of the lead sheath
shall be in
accordance with Table
4-23. The minimum thickness shall
be not less than 90percent of the values given in the table.
(See 6.8.3.)
COPYRIGHT National Electrical Manufacturers Association
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4.4.15.7 THICKNESS OF ALUMINUM SHEATH
When a thermoplastic jacket is applied over an aiuminum sheath, the average thickness the
of aiuminum sheath
shall be the sameas thar given in Table4-10. (See6.8.3.)
Table 4-23
THICKNESS OF LEAD SHEATH FOR CABLES
HAVING THERMOPLASTICJACKET
OVER M E LEAD SHEAM
Calculated Diameter of Cor@
Thidrnar d sheath
hchU
mm
ma8
mm
0.425 or less
10.80 or less
10.82-17.78
45**
1.14**
55**
17.81-26.67
26.70-38.10
38.13-50.80
50.83-76.20
70
85
95
110
1.40**
1.78
2.16
2.4 1
2.79
125
3.18
0.42M.700
0.701-1.050
1.051-1500
1501-2.000
2.001-3.000
3.001 and larger 7623 and larger
t h i d n e s s of lead s h a h for flrt twin &c shall be bucd on Ibc
ulpli.tadmajor u m diunacr.
+*Forrubnlrinc ubies.kl h i c k œ s ~
W
~1be 70 mils (1.78 mm).
+ l h e
4.4.16 Thermoplastic Jacket Over Metallic Armor
Thermoplastic jackets, when used, shall be extruded
h
m
.'Ihey
over the metallicannor and shall fit tightly t
shall be either:
1. Polyvinylchloridemeeting the requirements of
4.32.1, except that the cold bend requirements
shall
be as given in 4.4.15.4, or
2. Black polyethylenemeeting the requirements of
4 3 2 2 , or
3. Blackchlorinatedpolyethylenemeetingtherequire
ments given in 4 . 3 2 3 except that the cold bend
requirements shall be as given in 4.4.15.4.
4.4.16.1 THICKNESS
The average thickness of the thermoplastic jacket shall
be not lessthan thatspecifiedin Table 4-24. The minimum
thickness shall be not less than 70 perctnt of the value
given in the table.The minimum and maximum thickness
of the jacket shall be determined directly with a mimmeter,a steel scalewith pocket glass, or a micrometer m i m
scope on a ring of jacket removed from the cable. The
average ofthesedeterminations shall be taken as the
average thickness of
the jacket
4.4.16.2
IRREGULARITYINSPECTION
Jackets shall not have irregularities as determined
by the procedure of ICEA T-27-58 1. The methods to
be used for the jackets specified in paragraphs 4.13.1
through 4.13.1 1 inclusive are:
NEMA WC*5 9 2
= 6470247 0502776
913
NEMA WC 5-1992
Page 35
ICEA S-61402
Table 4-24
THICKNESS OFTHERMOPLASTIC JACKET OVER METALLIC ARMOR
Jacket Thickness
Calculated Diameter of Cable
Under Thermoplpstic Jacket
Cables With Interlocked
or Cormgated Armor
All Cables (Except Interlocked
or Corrugated Armored)
t n C b
mm
mus
mm
mils
mm
0.750 or less
0.751-1.500
1.501-2.250
19.05 or less
19.08-38.10
50
65
80
1.27
1.65
2.03
50
50
60
1.27
1.27
1.52
95
110
2.4 1
2.79
75
85
1.90
2.16
38.13-57.15
2.251-3.000
57.18-76.20
76.23 and
3.001 and larger larger
Method B
Table 4-25
SIZE OF GALVANIZED STEEL ARMOR
WIRE FOR BOREHOLE CABLE
Method C
Chlorinated
Polyethylene
Polyvinyl
Chloride
PolyethyleneThermoplastic
DIVISION II
ROUND WIRE ARMOR FOR BOREHOLE,
DREDGE, W A R ; AND VERTICAL
RISER CABLE
4.4.17 Scope
Division II gives detailsof construction of armor applicable particularly to borehole, dredge,shaft, and vertical
riser cables.
Calculated
Diameter
of Cable
Under Jute Beddlng
inches
Nominal Slze of
Armor W h
BWG mils mm
mm
0-0.750
0-19.05
0.751-1.000
19.08-25.40
1.001-1.700
25.4343.18
1.701-2.500
43.21-63.50
2.501 and larger 63.53 and larger
2.77
12 109
10 134 3.40
165
8
4.19
’
6 203 5.16
4 238 6.05
4.4.18 General
The requirements of Division I pertaining to quality of
The tensile safety factor [based on 50,OOO psi (35.2
materials, design, and construction apply
also to borehole,
kgf/mm2)]shall be not less than five.
If the requiredtensile
are designed
dredge, shaft, and vertical riser cable (which
safety factor is not maintained, the next larger size wire
for special uses), except as to the particular details exgiven in the table should
be used.
pressly set forth in the following sections for the respective
types of cable, oras otherwise modifled.
4.4.19.3 LAY
The length of lay ofarmor
the wires shall be not lessthan
4.4.19 Borehole Cable (Suspendedat One End
seven
nor
more
than
twelve
times their pitch diameter. The
Only)
armor shall be applied closely without appreciable space
4.4.19.1 ARMOR
between the wires.
Galvanized round steel wire shall beused for borehole
“Lay” is defined as follows: “lie lay of any helical
cable.
of a turn of the helix
element of a cable is the axial length
of that element.”
4.4.19.2 SIZE OF ARMOR WIRE
The size of the armor
wire shall be as given in Table4-25. 4.4.20 Dredge Cable
~~
~~~
~
~~
4.4.20.1ARMOR
Galvanized round steel wire shall be used for dredge
cable and shall be applied witha short lay.
4.4.20.2 SIZE OF ARMOR WIRE
The size of the armor wires shall be as given in Table
4-26.
COPYRIGHT National Electrical Manufacturers Association
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NEMA WC*5 7 2
m
6 4 7 0 2 4 7 050277785T
m
NEMA WC 5-1992
Page 36
K E A S-61-402
Table 4-26
SIZE OF GALVANIZED STEEL ARMOR
WIRE FOR DREDGE CABLE
Calculated
Dinmeter
of Cable
Under Jute Bedding
mm
lnches
0-1.700
Nominal Slze of
Armor Wire
BWG mils mm
043.18
2.77 109
at One
4.4.22 VerticalRiserCable(Suspended
End Only)
12
4.4.22.1 NONSHEATHED CABLE FOR INSTALLATION WITHIN BUILDINGS
4.4.22.1.1 Armor
Galvanized round steel wire shall be used for vertical
riser cable.
1.701-2.500
3.4043.21-63.50
134 10
larger
2.501 and
8
63.53 and
larger
165
4.19
4.4.22.1.2 Size Of Armor Wire
The size of the armor wires shall be as given in Table
4-28.
4.4.20.3 PITCH RATIO
The pitch ratio limits shall
be in accordance with Table
Table 4-28
4-27.
SIZE OF GALVANIZED STEEL
The pitch ratio is taken as the quotient resulting from
ARMOR WIRE FOR SHAFT CABLE
dividing the lengthof lay of the armor wires by the pitch
AND VERTICAL RISER CABLE
diameter of the armor wires.
Calculated
Diameter
of Cable
Nominal Slze of
Armor W h
Under Jute Bedding
Where unusual service conditions exist, it may be desirable to modify the above pitch ratio. If so, it should be
inches
mm
BWG mIls m m
defined before the cable design
is finalized.
Table 4-27
12
109
2.77
0-1.OoO
0-25.40
PITCH RATIO OF GALVANIZED
1.001-1.700
25.4343.18
10
134
3.40
WIRE ARMOR FOR DREDGE CABLE
CalculatedDiameter Over the ArmorWire
Mlnlmum
8 165
4.19
1.701-2.500
43.21-63.50
Pitch Ratio
inches
mm
0-2.500
0-63.50
2.5
63.53 and
larger
3.0
2.501 and larger
2.501 and
larger
63.53 and
larger
6
203
5.16
1
The tensile safety factor [based on 50,000 i (35.2kgf /mm ] shall
be not less than seven. the requid tensg safety factor is
maintained. the next largersize wire given in the table shouldbe used.
4.4.21 Shaft Cable
When shaft cable is clamped to the shaft structure or
used (either tape or wire) shall
wall, the metallic coverings
comply with the requirements of4.4.3 through 4.4.16. If,
during installation, the shaft cable
is suspended fromone
end, galvanized round steel wire armor
shall be used.
The size of the armor wiresshall be as given in Table
4-28, but the tensile safety factor
shall be not less than five.
4.4.22.2 SIZE OF ARMOR WIRE FOR SHEATHED
VERTICAL RISER CABLE
The size of armor wire for sheathed vertical riser cable
for indoor installationshall be in accordance with
4.4.19.2
for borehole cable, but with a tensile safety factor of not
less than four.
4.4.23 Wire-band Serving
Where wire-band servings directly over the armor are
required for cable suspended vertically from
one end,No.
12 BWG (O. 109 inch) wire shall be used. The length of
the serving band and the spacingof the band throughout
the length of the cable shall be in accordance with Table
4-29.
Table 4-29
SPACING AND LENGTHOF BAND SERVINGS
Calalated Diameter Over the Armor
Wire
38.13-63.50
inches
mm
0-1SOO
15.2
0-38.10
Madmum Band
Spacing
feet
Length of
B a
meten
50
1.501-2.500
larger
2.500 and
larger
63.53 and
25
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
7.6
inches
mm
3
76.2
4
102
4
102
NEMA WC*5
72
6470247 0502778 7 7 6
ICEA s-61-402
NEMA WC 51992
Page 37
The wire bands shall be applied suffkientty tight to
prevent their movement along the cable as a result of
handling the cable during installation.
apply alsoto buried round wire armored cables.
except as
to particular details expressly set forth in the following
sections or as otherwise modified.
4.4.26 Armor Wire and Jute Servings (Sheathed,
Jacketed, Nonsheathed, and Nonjacketed
Cables)
The size of armor wire and thickness of jute bedding
4.4.24 scope
shall be in accordance with Table4-30.
Division III gives details of construction of armor for
be not less than
buried landc a b l e s where greater longitudinal strength than The lengthof layof the armor wires shall
three
nor
more
than
twelve
times
their
pitch
diameter.This
that provided by flat tape armor is required, but not the
lay
shall
be
used
such
that
the
armor
will
be
applied
closely
strength of the regular armorrequired for submarineservwithout
appreciable
space
between
wires.
ice.
Ajute serving as specified
in 4.4.11 shall be applied over
4.4.25 General
the armor.
The requirements of Division I (4.4.3 through 4.4.16)
pertaining to quality of materials, design, and construction
DIVISION 111
ROUND WIRE ARMOR FOR BURIED CABLE
(4.4.24THROUGH 4.426)
Table 4-30
THICKNESS OF JUTE BEDDING AND SIZEOF ARMOR WIRE
Calculated Diameter of Cable Under Jute Bedding
inehes
450-0.750
0.751-1
65.o00
80
Nominal Size of Armor Wire
Minimum Thickness of Jute Bedding
mm
mils
mm
0-19.05
1.14
19.08-25.40
1.65
BWG
83
109
mlls
mm
14
2.11
12
2.77
43.21-63.50
1.701-2.500
2.501
larger and
63.53
larger and
1
2.4
95
6 5.16*203*
*For cable diameters over 2300 inches (63.50 mm) where greater stren is desired than obinable with No. 6 BWG (203 mils) or where the TCq u i d number of wires e
x
&the capacity ofthe a m h g ma&&, ago. 4 BWG (238 nuls) wire may us&
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ICEA s-sl-402
NEMA WC 51992
Page 39
Part 5
ASSEMBLY, FILLERS, AND CONDUCTOR IDENTIFICATION
~~~
5.1
ASSEMBLY
OF
CABLES
Mdtipl-
MULTIPLE-CONDUCTOR
cables shall be -bled
Conduetors
ln Cable
in accord-
ancewithPart5unlessothenvisemodifiedbyPart7.
5.2
MULTIPLE-CONDUCTORROUND CABLES
Where cables consistof a coreof conductors without a
layer of conductors over them, the individual conductors
shall be c a b l e d together witha left-hand lay.
Where one layer of conductors is involved, the layer
shaII have a left-handlay. Where more than one layer of
conductors is involved, the outer layer shall have a lefthand lay.
A left-hand lay is defined as a counterclockwise twist
away tiom the observa.
Where necessary, the interstices SUIbe filled to give
the completed cablea substantially circularcross section
(see5.4).
The length of lay of the individual conductors in the
outer layer of any cable shall not exceed the valuecdculated from the factor given in the following table. Fot
cables withfour or less conductors, the individual conductor diameter is the dculated overall diameter ofthe individual conductor. For cables five
withor more conductors,
is the calculated diameter over the
the assembled diameter
assembled conductrrrs. Whenmore than one layer of conductors is involved, the lay of the conductorsin the i n n e r
layers shall be governedby the consuuction of the cabling
machine.
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
~
~~
~~
~
~
Numba of
Factors for MPrimum Length of L.7.
2
3
30 times
individual
conductor
diameter
35 times
individual
conductor
diameter
4
40 times
individual
conductor
diameter
5 or more 15 times assembled diameter
* For conductor assemblies without an overall covering, the
maximum length
- of lay shall not exceed 60 times the diameter
' of the largest insulated conductor.
1
I
5.3 FLAT TWINCABLES
For flat twin cables with diameters over the individual
conductor of 0.5m inch (12.70 mm) or less, filling is not
required. For flat twin cables with diameters over the
individual conductorof more than 0.500inch (12.70 mm),
filling shall be used to give a substantially flat surEace
parallel to the planeof the majar axis.
Flat twin cablesare not recommended where
the diameter over the conductor insulation exceeds
1 inch (25.4
mm).
5.4 FILLERS
Fillers of suitablematerial shall be used in the interstices
of the cable where necessaryto give the completed cable
a substantially circularcross section.
5.5 CONDUCTOR1DENTIFICATlON
5.5.1 PowerCables
When required, conductors shall be identified by any
suitable means.
NEMA WC 5-1992
Page 41
ICEA S-61402
Part 6
TESTING AND TEST METHODS
6.1
TESTING
All wires and cables shall be tested at the factory to
determine their compliance
with the requirements given in
Parts 2,3,4,5, and 7. When there is a conflictbetween the
test methods given in Part 6 and publications of other
organizationsto which referenceis made, the requirements
given in Part 6 shall apply.
Tests shall consist of the following, as required,
samples-see
6.2 to
6.10,
namely, (1) tests on
inclusive,and 6.14 and 6.15, (2) testsonentire
lengths ofcompletedcables-see6.1
1 to 6.13,
inclusive, and 6.15, and (3) conductorresistance
tests-see 6.3 on samplesor on entirelengths of
completed cables.
The test methods describedin Part 6 are not completely
applicable to all types of wires and cables, nor do they
to a particulartype of wire or
include every test applicable
cable. To determine whichtests are to be made, referto the
parts in this publication which set forth the requirements
to be met by the particular materialor typeof cable.
6.2 TESTS ON SAMPLES
Tests shall be ma& on samples selected at random. Each
testsampleshall be taken from theaccessible end of
dif€erent coils orreels. Each coil or reel selected and the
corresponding sampleshall be identified. The number and
lengths of samples shall be as specified under the individual tests.
6.3 CONDUCTOR TEST METHODS
When samples are measured,they shall be s e l e c t e d in
'accordance with NEMA Standards Publication No. WC
54fICEA T-26-465,
P h A.
6.3.1 Method for DC Resistance Determination
Measurementsshall be made either ona sample at least
1 foot (30.5 cm) longor on the entire length
of completed
cable. When the nominal resistance
is less than 1 ohm, the
measurement shall be made wilh a Kelvin-type bridge or
is 1 ohm or
a potentiometer. When the nominal resistance
more, the measurementshall be made with a Kelvin-type
bridge, or a Wheatstone bridge,or a potentiometer.
When measurements are made on a sample, either as
original measurements or for verification, the following
precautions shallbe taken:
1. Current contacts shall be made in such a way as to
assure essentially uniform current density among
the wires.
COPYRIGHT National Electrical Manufacturers Association
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2. When potential leadsare used, the distance between
each potential contact and the corresponding current
contactshall be at least equal to 1% timesthe
circumferenceof the specimen.When a Kelvin-type
bridge is used, the yoke resistance (between reference standard andtest specimen) shallbe appreciably smallerthan that of either the referencestandard
or thetest specimen unless a suitable lead cornpensation is used, or it is known that the coil and lead
ratios are sufficiently balanced so that variation in
yoke resistance will not decrease the bridge accuracy below that given in item 4.
3. The distance between potential elecnodes shall be
measured to an accuracy offl.05 percent To assure
this accuracy in measuring the length betweenpotential contacts, the surfacein contact with the test
specimen shall bea substantially sharp knifeedge.
4. Resistance measurementsshall be made to an accuracy of M.15 percent. To assure a correct reading,
the reference standard and the
test specimen should
be allowed U) come to the same temperature as the
surrounding medium. (If the reference standard is
made of manganin, it is possible to obtain c o m t
readings with the test specimen at reference temperatms other than room temperature.)
5. In all resistance measurements, the measuring current raises the temperature of the medium. Therebe low and
fore, the magnitude of the current shall
the time of its use short enough so that changes in
resistance Cannot be detected with the galvanometer.
resis6. In bridge measurements, the potential contact
tance shall be as low as possible. If low contact
resistance Cannot be achieved, appropriate contactresistance correctivecircuitsshall be used. To eliminate errors due to contact potential, two mdings,
one direct and one with current reversed, shall be
taken indirect succession. Check tests
may be made
by turning the specimenend for end and repeating
thetest.Thematerialusedforthe
w o potenual
contacts shall be the Same to minimize imbalanced
contact potentials.If necessary, the contact
surfaces
shall be cleaned.
at25 'C
7. To convert measured resistance to resistance
(7773, the formulas and tabulated factors givenin
Table 6- 1 or the procedurein AST" B- 193 shall be
Used.
NEMA WC 51992
ICEA s-61402
Page 42
Table 8 1
FACTORS FOR CONVERTING MEASURED DC RESISTANCETO 25’C(770
h
p
e
r
a
u
tr
q ‘C
Multiplying Factor for Copper
Multiplying Factor for Aluminum
O
5
10
1.107
1.o84
1.o61
1.110
1.O85
1.M3
15
20
25
1.041
1.mo
1.o00
30
35
40
1.o40
1.mo
1.o00
0.981
0.963
0.945
45
50
55
0.928
0.9 12
0.8%
0.927
0.910
0.894
60
0.88 1
0.866
0.852
0.838
0.825
0.812
0.800
0.878
0.863
0.849
65
70
75
80
85
90
0.98 1
0.962
0.944
0.835
0.821
0.808
0.7%
The correction factors are based upon copper having100percentconductivityand
conductivity.The factors are derived from the f m u k
R1 =R2
aluminum having 61 percent
2595 far copper
2345 + T2
For more accurate determination of resistance. allowing for merent conductivities. see “Copper Wire Tables,”National
Bureau of Standards Handbook 100, or “Aluminum Wm Tables,” National Bureau of Standards Handbook 109,and ASTM
B193.
COPYRIGHT National Electrical Manufacturers Association
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NEMA WC*5 92
m
64702470502784
T9T
m
NEMA WC 5-1992
Page 43
ICEA S-61-402
lot consists of 20 or more coils or reels, not less than 10
percent of the coilsor reels shall be selected at random and
at least one determinationof the thickness shall be made
on each coil
or reel so selected. In the case of multiple-conductor cables, the measurements shall be made on the
individual conductors before they are cabled.
n
6.4.3Measurement of Thickness
A=
di2
The measurement of thickness for cables with unbondcd
i=l
components shall be made with either a micrometer or
microscope but, for cables with bonded components, shall
Wherebe
made only with a microscope. The micrometer and
A= cross-sectional areain kcmil
microscopeshall be capable of makingmeasurements
di= diameter of
the ith wire in mils determined according
accurate to at least 0.001 inch.
to 6.3.3.1
n= total number of wires in conductor
6.4.3.1 MICROMETERMEASUREMENTS
When a micrometer is
used, the average thickness
of the
6.3.2.2 CROSS-SECTIONAL AREA BY WEIGHT
insulationshallbetaken as one-half of thedifference
The cross-sectional areashall be determinedin accordbetween the mean of the maximum and minimum diameance with ASTM B263.
ters over the insulation
at one point and the average diame6.3.3 Methods for Diameter Determination
ter over the conductor or any separator measured at the
same point. The minimum thickness ofthe insulation shall
6.3.3.1 DIAMETER BY MICROMETER
be
taken as the difference between a measurement made
MEASUREMENT
thinnest
over
theconductor or anyseparatorplusthe
Diameter measurements shallbe made witha micromeinsulation
wall,
and
the
diameter
over
the
conductor
or any
ter or other suitable instrument readable
to at leastO.OOO1
separator.
The
fiist
measurement
shall
be
made
after
slicinch. Round wires shall be measured at each end of the
off
the
thicker
side
of
the
insulation.
The
thickness
of
ing
of the sample. The average
of
sample and near the middle
any separator shall not be included in the thickness of
the three measurements shall be taken
as the diameter.
insulation.
Stranded conductors shallbe measured around the cirIf the wire or cable has a jacket, the jacket shall be
cumference of the conductor perpendicularto the axis of
removed
and the minimum and maximum thickness of the
the conductor andon the extensions ofa line through the
jacket
determined
directly with a micrometer. The average
center of the conductor and through the center
of two wires
of
these
determinations
shallbetaken
as theaverage
in the outer layer which180
aredegrees apart. The average
thickness
of
the
jacket.
of three measurements shallbe taken as the diameter.
6.3.2 Methods for Cross-sectional Area
Determination
6.3.2.1 CROSS-SECTIONAL AREA BY
DIAMETER MEASUREMENT
The cross-sectional area shall
be calculated as follows:
c
6.3.3.2 DIAMETER BY TAPE MEASUREMENT
A diameter tape readable
to at least 0.005 inch shall be
wrapped oneturn (360") around the circumference of the
conductor, tightly and perpendicular to the axis of the
be
conductor. The average diameterof the conductor shall
read directly from the diameter
tape.
6.4.3.2 MICROSCOPEMEASUREMENTS
When a microscopeis used, the maximum and minimum
thickness shall be determined from a specimen cut perpendicular to the axis of the sample so as to expose the full
cross-section. The average of these determinations shall be
taken as the average thickness.
TEST SAMPLES AND SPECIMENS FOR
PHYSICAL AND AGING TESTS
6.4.1 General
Physical and aging tests shall
be those requiredby Parts
3,4, and 7.
6.4.4Sampling of Insulation for Physical and
Aging Tests
Samplesof insulated conductors for the unaged and aged
physical tests shall be selected in accordance with Table
6-2.
6.4
6.4.5 Sampling of Jacket for Physicaland Aging
6.4.2 Number of Thickness Measurements
Tests
When the lot of wire
be inspected
to
consistsof twocoils
Samplesofjacketedcablefortheunagedandaged
or reels, or less, at least one determinationof the thickness physical tests shall be selected in accordance with Table
shall be made on each coil or reel. When the lot consists 6-3. No tests shall be made on jackets less than 30 mils
of more than two coils or reels and less than 20 coils or
(0.76 mm) in thickness.
reels, at least one determination of the thickness shall be
two coils or reels taken at random. If the
made on each of
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
NEMA WC 5-1992
Page 44
ICE,A S-61-402
Table 6-2
FO >
SAMPLES
Quantity
Completed
of
feet
Size of Conductor
Cable Ordered
meters
kcmil
Number of Minimum LengthEach
of
Sample
Samples
conductor feet conductor meters
mm2
~~
than
Less
2OOO
than
Less
250
than
Less
Less
610
than
none
larger
Less
1000and
than 127largerand 250 Less
305 than
2000-5oooO
610-15.240
lO00-25OOO
305-7620
More than 7620
More than 25000
1larger
and127
larger
and250
7620
First
First 25OOO
Each additional 25000
Each additional 7620
More.
5oooO
than
More
than
15240
5oooO First 250 than Less15240First
additional
Each
5oooO
additional
15240
Each
127
Less than250
250 and larger
none
...
...
1
6
3
Less than 1.8
127
127 and larger
1
3
250andlarger127andlarger
Less than 250
1
1
127
Less than
Less
127than
1
~~
...
...
0.9
3
0.9
0.9
6
6
1.8
1.8
Table 6 3
NUMBER AND LENGTHOF SAMPLESc
Quantity of Completed Cable Ordered
Nominal
Overall
feet
Less than 2000
Less than 1000
20"5oooO
lO00-25OOO
50.8
larger
meters
Less than 610
Less than 305
610-15240
larger
305-7620
and1.0
and
Number of
Samples
Diameter of Cable
inches
Less than 1.0
1.O and larger
Less than 1.0
but
larger
and
25.4
but
2.0
than
less
2.0
mm
Minimum
Length of
Each Sample
cable cable
feet meters
Less than 25.4
25.4 and larger
Less than 25.4
less than
none
none
...
...
1
6
1.8
1
3
0.9
2
...
...
0.6
50.8 and larger
ess
1.0
More. than 15240
More. than 5oooO
than5oooOLess 15240 First
First
1.0
Soo00
thanLess
additional
15240
Each
additional
Each
More
than
25000
More
than
7620
First
7620
First 25OOO
additional
Each
Zoo0
additional
Each1.0
7620
Less
25.4than
1.0larger
25.4
and
larger
than
2.0
and
less
but
50.8
2.0
and
than
less
larger
but
1
but less than
1.8
6
1
1
3
3
0.9
0.9
1
2
2
0.6
0.6
25.4 and larger butless than
50.8
More than 7620
More than 25000
0.8 larger
and
2.0
7620 First
First Z
O
O
0
gerand 2.0additional
7620
Each
additional
25000
Each
6.4.6 Number of Test Specimens
From each of the samples selected in accordance with
6.4.4and 6.4.5,
test specimens shall
be prepared in accordance with Table6-4.
6.4.7 Size of Specimens
The test specimens
shall be prepared using either
ASTM
D412 Die B or E with specimen length not less than 6
inches(152mm)orASTMD412DieCorDwithspecimen
length notless than 4.5inches (114mm).
In the case of wire and cable smaller than size6 AWG
having an insulation thickness of 90 mils (2.29 mm) or
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
1
less, the test specimen shall
be permitted to be the entire
section of the insulation. When the full cross-section is
used, the specimens shall notbe cut longitudinally.In the
6 AWG and larger, or in the case
case of wire and cable size
of wire and cable smaller than size 6 AWG having an
insulation thickness greater than
90mils (2.29 mm), specimens rectangularin section with cross-section not greater
than 0.025 square inch (16 mm2) shall be cut from the
insulation. In extreme cases, it may
be necessary to use a
segmental specimen.
NEMA WC*5 92
6470247 0502786
KEA S-61-402
862
NEMA WC 5-1992
Page 45
Table 6-4
NUMBERgFSPEClMENS
M
Total Number of
' k t Specimens
Determination ofpropertiesunaged
3**
tensile strength and ultimate elongation
Accelerated aging tests
Air
3**
Oil immersion
3**
Heat Shock
1*
Heat
3**
Cold
1'
Flame
1*
cracking
Environmental
See 6.9
coefficientAbsorption
See 6.9
stripping
I*
wrap
1*
*For the heat-shock, cold-bend, flame, stripping, and wrap tests,
only one
specimen shall be tested.
**One test s cimenout of threeshallbetestedandtheothertwo
specimens h e g i n reserve, except that whenonly one sampleis selected
in accordance with6.4.4 and 6.4.5, all three test specimens shall be tested
and the averageof the results reported.
Specimens fortest on jacket compounds shallbe taken
from the completed wire or cable and cut parallel to the
axis of the wire or cable. The test specimen shall be a
whose diameteris that of the insulation.The height of the
segment is the wallof insulation on the side from which
the sliceis taken.
When the cross-section of slice
the is not a segment of a
circle, the area shallbe calculated from a direct measurement of the volume or from the specific gravity and the
weight ofa known length the
of specimen having a uniform
cross-section.
The values maybe obtained from a table givingareas
the
of segments of a circle
unit for the ratio of the height of the
segment to the diameter of the circle.
6.4.10.3 When the conductoris large and the insulation
thin and when a portion of a sector of acircle has to be
taken, the area shall be calculated as the thickness times
the width.
This applies either to a straight test piece or
to one
stamped out with adie and assumes that corrugations have
been removed.
6.4.10.4 When the conductor is large and the insulation
thick and when a portion of a sector of a circle has tobe
taken, the area shall be calculated
as the proportional part
of the areaof the total cross section.
6.4.10.5 The dimensions of specimens to be aged shall
segment cut with a sharp knife, or a shaped specimen cut
be determined before the aging
test.
out with a die, and shall have a cross-sectional area not
greater than 0.025 square inch(16 mm2) after irregulari6.4.11 Physical Test Procedures
ties,corrugations, and reinforcing cords or wires have been
See 6.4 for Test Samples and Specimens.
removed.
6.4.11.1 TESTTEMPERATURE
6.4.8Preparationof
Specimens of Insulation
Physical tests shall be madeat a room temperature not
and Jacket
less
than 20°C (68°F) nor more than 28°C (82.4'F). The
The test specimen shall have no surface incisions and
test specimens shallbe kept at room temperature for not
shall be as free as possiblefromotherimperfections.
less than 30 minutes prior to the test.
Where necessary, surface irregularities such as corruga6.4.11.2 TYPE OF TESTING MACHINE
tions due to stranding, and such, shall
be removed so that
the test specimen willbe smooth and of uniform thickness. The testing machine should
be in accordance with
6.1 of
ASTM
D
412.
6.4.9 Specimen for Accelerated Aging Test
6.4.11.3 TENSILE STRENGTH TEST
Specimens shall notbe heated, immersed in water, nor
subjected to any mechanical or chemical treatment not
The tensile strength testshall be made with specimens
specifically described in this standard.
prepared in accordance with6.4.6and 6.4.7.The length of
theshall be equal. Gauge marks
all of the specimens for test
6.4.10 Calculation of Area of Test Specimens
shall be 2 inches (51 mm) when using 6 inch (152 mm)
6.4.10.1 Where the total cross-section of the insulation
specimens and1 inch (25 mm) apart when using4.5 inch
is used, the area shallbe taken as the difference between
(114 mm) specimens except that1 inch (25 mm) shall be
the areaof the circle whose diameter is the average outside
usedforpolyethyleneregardless
ofspecimenlength.
diameter of the insulation and the area of the conductor.
Specimens shallbe placed in thejaws of the testing maThe area of a stranded conductor shall be calculated from chine with a maximum distance between
jaws of 4 inches
its maximum diameter.
(102 mm) except 2.5 inches (63.5 mm) for polyethylene.
The specimen shall be stretched at the rate of 20 inches
6.4.1 0.2 Where a slice cut from the insulation
by a knife
(508 mm) per minute jaw speed until it breaks.
held tangent to the wire
is used and whenthe cross-section
The tensileandelongationdeterminations for comof the sliceis the cross section
of a segmentof a circle, the pounds for which the compound manufacturer certifies
area shall be calculated as that of the segmentof a circle
that the base resin content is more than 50 percent by
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
NEMA WC 5-1992
Page 46
weight of high density polyethylene (having a density of
0.926 Mg/m3 or greater or total base polyethylene resin
content (havingadensity of 0.926 Mg/m3or greater), shall
be permitted to be tested
at a jaw separation ofrate
2 inches
mm per minute)as an alternate to 20 inches
per minute (51
per minute (508 mm per minute). Specimens shall break
between the gauge marks and the tensile strength shall
be
calculated on the area of the unstretched specimen. Specimen length, gaugemark distance, and jaw speed shallbe
recorded with the results.
ICEA S-61-402
pletion of the aging tests the
anddetermination of physical
properties. Physical tests on both the aged and unaged
specimens shallbe made at approximately the same time.
6.4.12.2 AIR OVEN TEST
The test specimens shallbe heated at the required temperature for the specified period in an oven having forced
circulation offreshair. The oven temperature shall be
recorded automaticallyon a chart, and controlled fto
l 'C.
6.4.12.3 OIL IMMERSION TEST FOR POLYVINYL
CHLORIDE INSULATIONAND JACKET
6.4.11.4 ELONGATION TEST
Thefollowing test specimensshallbeimmersed in
Elongation at rupture shall be determined simultaneASTM Oil No. 2, described in Table 1 of ASTM
D 47 1, at
ously with the test for tensile strength and on the same
specimen.
70°C+1'C for 4hours:
The elongation shall be taken as the distance between 1.theInsulated conductors in sizes smaller than 6 AWG,
except for the ends.
gaugemarksatrupturelesstheoriginalgaugelength
marked on the specimen. The percentage of elongation at 2. Die-cut specimens of the insulator in sizes 6 AWG
rupture is the elongation divided bythe original gauge
and larger.
3. Die-cut specimensof the jacket.
lengthandmultipliedby100.Specimenlength,gauge
mark distance and jaw speed shall be reported with the
be removed
At the end of this time, the specimens shall
from the oil, blotted to remove excessoil and allowed to
results.
rest at m m temperaturefor aperiod of 16 to 96 hours. The
6.4.12 Aging Test
of the specimens shall then
tensile strength and elongation
be determined in accordance with 6.4.11 at the same time
6.4.12.1 AGING TEST SPECIMENS
that the original properties
are determined.
Test specimens of similar size and shape shall be prepared from each sample selected in accordance with 6.4.4 6.4.13 Heat Shock
and6.4.5,threeforthedeterminationoftheinitial
or
Samples (see 6.4.4and6.4.5)ofpolyvinyl
chloride
unaged properties, and three for each aging test required
insulated conductor and jacketed cable shall be tightly
for the insulation or jacket being tested. One specimen
of
wound arounda mandrel having a diameter
in accordance
each three shallbe tested and the other two held
as spares
with Tables6-5 and 6-6.The samples shallbe held f m l y
except that, where only one sample is selected, all three
in place and subjected to a temperature 12loC+1"C
of
for
specimens shall be tested and the average of the results
1 hour.
reported.
In thecase of wire and cable smaller
than 6 AWG having
Table 6-5
an insulation thickness less than 90 mils (2.92 mm), the
INSULATED CONDUCTOR
insulation shall be subjected to the aging condition with
the conductor removed and each end
of thespecimen
Diameter of
suitably plugged.
Mandrel as a
Multiple of the
In the caseof wire and cable size AWG
6
and largeror
Insulated
Conductor Size,
withaninsulationthicknessof
90 mils(2.29mm) or
AWG or kcmil
Conductor
Number
of Turns
greater, samples shall be cut from the insulation with a
Diameter
cross-section not greater than 0.025 square inchmm?.
(16
1
6
8 and smaller
Die-cut specimens shall be smooth before being subjected to the accelerated aging tests wherever6 the thickness
6-2
2
of the specimenwill be 90mils (2.29 mm)
or greater before
1
1
2
smoothing.
Simultaneous aging of different compounds should be
avoided. Some migration
of plasticizer is known to occur.,
The test specimens shall
be suspended vertically in such
a manner that they are not in contact with each other or
with the sides of the oven.
The aged specimens shall have a rest period of not less
than 16 hours nor more than 96 hours between the com-
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
1 / 0
2
'/2
(180-degree U bend)
5
'/2 (1 80-degree U bend)
250
and
larger
Series lighting cables, sizes 8 , 6 and 4 AWG, shall be
wound six turns around a mandrel which
is two times the
insulated conductor diameter.
>
NEMA WC*5 92 W 6 4 7 0 2 4 70 5 0 2 7 8 8
635 W
ICEA S-61-402
NEMA WC 5-1992
Page 47
6.4.14 Heat Distortion
6.4.14.1 TEST SPECIMEN
6.4.14.1.1 Polyvinyl Chloride InsulationOn Conductors of Sizes 410 Awg and Smaller
The initial diameterof a l-inch (25.4 mm) specimen of
be measured witha micromethe insulated conductor shall
ter caliper having a flat surface
on both the anvil and
spindle. The diameterof the uninsulated conductor shall
be measured also, and the original thickness
of the insulation, Tl, shall be calculated as follows:
D-C
T1 =2
WhereT1 = Original thickness of the insulation.
D = Initial diameterof the insulated conductor.
C = Diameter of the uninsulated conductor.
6.4.14.1.2 Polyvinyl Chloride InsulationOn Conductors of Sizes Larger Than 4/0 Awg and
PolyvinylChlorideandPolyethylene
Jackets
A sample approximately 8 inches (203mm) long shall
be prepared to have a thicknessof 50 mils (1.27mm) +lo
mils and smooth surfaces. From this sample, test specimens(see6.4.4and6.4.5)
1 inch(25.4mm)longand
9/16 inch (14.3 mm) +!"i6 inch wide shall be prepared.
Wherethediameterofthe
cabledoesnotpermitthe
preparation of a specimen 9/16 inch (14.3 mm) wide, a
molded sheet of the same compound may
be used.
The thickness of the specimen, TI, shall be measured
with a Randall& Stickney, or equivalent, gauge having a
%-inch (9.5 mm) foot with no loading other than the 85
grams of the gauge.
6.4.14.2 TEST PROCEDURE
The following steps shall be completed in 3 hours. A
Randall & Stickney gauge,or the equivalent,with a load
as indicated in Table6-6 on the foot shall be placedin an
oven which is preheated to the specified temperature. At
the end of 1 hour, thetest specimen shallbe placed in the
the test specimenshall
oven,andboththegaugeand
remain in the oven for 1 hour. At the end of this l-hour
period, the specimen shall be placed directly under
foot the
of the gauge and allowed
to remain inthe oven under load
for 1 hour at the specified temperature.
At the end of thisperiod,the dial ofthe gauge shall be
read for:
1. The value of F for insulated conductors 4/0 AWG
and smaller, andthe thickness of the insulation,
T2,
shall be calculatedas follows:
F-C
T2 =2
2. The value of T2for insulated conductors larger than
4/0 AWG and jackets.
The distortion shallbe calculated as follows:
Distortion percent=-T1-Tzxlm
T1
WhereT2 = thickness of the insulation after the heat distortion
test.
F = Final outside diameter
as read from the gauge.
C = Diameter of the uninsulated conductor.
The gauge loads for the heat distortion test shallbe as
indicated in Table 6-7:
Table 8 6
JACKETED CABLE
Outside Diameter of Wire or Cable
inches
mm
Diameter of Mandrel as a Multiple
of the Outside Diameter of Cable
Number of
Adjacent Turns
04.750
0-19.05
6
3
0.75 1-1 SOO
19.08-38.10
8
180degree bend
12
bend
180-degree
and 38.13 larger and 1.501
COPYRIGHT National Electrical Manufacturers Association
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ICEA S-61-402
NEMA WC 5-1992
Page 48
Table 6 7
GAUGE LOADSFOR THE
for sizes larger than
310 AWG, bent 180 degreesaround a
mandrel. The mandrel diameters shall be in accordance
with Table 6-8. The bending shallbe accomplished at an
approximately uniform rateso that the time consumedis
not more than1 minute.
*
Load
On
Gauge,
Grams
6.4.15.2 POLYVINYL-CHLORIDE JACKET
The test specimen shall be subjected to the specified
300for 1 hour and then bent180 degrees around
temperature
1100
a mandrel having a diameter in accordance with Table 6-8
500
immediately upon its removal from the cooling chamber.
750
The bend shall be made at a uniform rate, and the time
required shall1000
not exceed1 minute.
6.4.16 Wrap Test
The specimenwith the nylon-covered insulated conductor shallbe taken from the completed cable and wrapped
Polyvinyl-chloride insulatedseries lighting cametal mandrel having a diamefour turns around a smooth
ble,
lo00
the specimen
ter 6 times that of the specimen. The ends
of
shall be secured to the mandrelso that four complete
turns
6.4.15 Cold Bend
of the specimen will be exposed to the air between the
securing means. The specimen and mandrel shall
be sus6.4.15.1 POLYVINYL-CHLORIDE INSULATION
pended
for
24
hours
in
a
full-draft
circulating-air
oven
at
The insulation shall not show any cracks when a sample
a
temperature
of
95.0°C+2.0"C
(203.OoFk3.6"F),
after
of insulated conductor which has been subjected to the
which the specimen and mandrel shall be removed from
specified temperature for1hour is,upon removal from the
the oven and cooled for
1hour ina silica-gel desiccator
or
cooling chamber, immediately wound around a mandrel
at
the
equivalent
at
24.0"Ck
3'C
(75.2"F&5.4"F).
The
specileast six adjacent turns forsizes 310 AWG and smaller or,
Polyvinyl-chlorideinsulated conductorsize, AWG
18
16
14-8
6-17
1/0-4/0
Polyvinylchloride insulated conductors larger
than 410 AWG and all polyvinyl chloride and
poIyethylene
jackets-smoothed
samples
2000
Table 6-8
POLWINYL-CHLORIDE-INSULATEDCONDUCTORS
~~~~~~~
~
~
Diameter of Mandrel
Conductor Size, AWG or kcmil
18
16
14
12
10
~
Number of l h r s
inches
mm
5/16
7.9
7-9
12.7
14.3
15.9
6
6
6
6
6
19.0
31.8
34.9
39.7
68.3
6
6
6
6
6
73.0
76.2
82.6
88.9
6
6
6
'h (180-degree U bend)
5/16
'/2
9/16
V8
8
6
4
2
1
110
210
310
410
250-500
More than 500
Series lighting cable, all
sizes
3/4
1%
1%
1 9/16
2 "h6
27/8
3
3 '/4
3%
.
8 x cable diametex
10 X cable diameter
5 x cable diameter
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
'/"L(180-degree U bend)
(180-degree U bend)
¡
/
"
L
(180-degree U bend)
S T D m N E M A WC 5-ENGL L792
ICEA s-61402
Outside Diameter of Wire or Cable
0-0.800
0.801 and larger
6.5
b470247 0533755 T 8 4 D
NEMA WC 5-1992
Page 49
men shall be straightened immediately
upon removal from
the desiccator and inspected for
surfacecracks.
Table 6 9
MANDREL DIAMETERS
inches
m
-
mm
0-20.32
20.35 and larger
~
Dinmeter of Mandrel as a
Multiple of the Outside
Diameter of Cable
8
10
FLAME TEST
wrapped once around the specimen,
with the gummed side
be pastedevenly
towardtheconductor.Theendsshall
together and shall project 3/4 inch (19. O mm) from the
specimen on the opposite side of the specimen to that to
which the flame isto be applied.
The paper tab shall be moistened only to the extent
necessary to permit proper adhesion. The height ofthe
flame with the burner vertical shall be adjusted
to
5 inches
(127 mm) with an inner blue cone 1$5 inches (38.1 mm)
high.
6.5.1 The test apparatus shall consistof the following:
6.5.3 Theburner,withonlythepilot
lighted, shall be
1. Test chamber of sheet metal 12 inches (305 mm)
placed in front of the sample so that the vertical plane
wide, 14 inches (356mm) deep and24 inches (610
through the stem
of the burner includes the of
axis
the wire
mm) high, which is open at the top, and which is
or cable. The angleblock shall rest against
the jig, which
provided withmeans for clamping the
test specimen
shall be adjusted so that there isa distance of 1 l 4 inches
at theupperendandsupportingitinavertical
(38.1 mm) along the axisof the burner stem between the
position.
tip of the stem and the surface of the specimen.
The valve
2. Means for adjusting the position of the test specisupplying thegas to the burner proper shall be
then
opened
men.
and the flame automatically applied to the sample. This
8 AWG and smaller
3. A4-pound (1.8-kg) weight (for
valve shall be held open for 15 seconds and then closed for
sizes) to be attached to the lower end of the test
15 seconds. This process shall be repeated four times.
specimen to keep it taut.
During each application of the flame, the specimen shall
4. Tirrill burnerwithanattachedpilot
light and
be adjusted, if necessary, so that the topof the inner blue
mounted on a 20-degree angle block. The burner
cone touches the surface
of the specimen.If more than 25
shall have a nominal boreof 78 inch (9.5 mm) and
percent of the extended portion of the indicator
is burned
a lengthof approximately 4 inches O2(1mm) above
after the five applications
of the flame, the wireis considthe primaryair inlets.
ered to have conveyed flame.The duration of burning of
to thebottom
5. An adjustable steel angle uig) attached
the specimen after the fiftfi application of the flame shall
of the chamberto insure the c o a t location of the
be noted, and any specimen which continues to burn for
burner with relationto the test specimen.
more than 1 minute shallbe considered to have failedttus
of ordinary illuminating gas at normal test.
6. Gas-A supply
pressure.
6.6 PHYSICAL TESTS FOR SEMICONDUCTING
7. Watch or clock with a hand which makes one comMATERIAL INTENDED FOR EXTRUSION
plete re-volutionper minute.
6.6.1 Test Sample
8. Flame indicators consisting of strips of 60 pound
One test sampleshall be molded from each lot of semi(27.2-kg) gummed kraft paperhaving anominal
conducting material intended for extrusion
on the cable.
thickness of 5 mils (0.127 mm) and a width of '12
inch (12.7 mm).*
6.6.2Test
Specimens
c~~ paperuscd for the indiuton is knownIO the d e as 6apound stock
and is material subswtially the same as rhat described In Federal S p i fication LIU-T- 111 covering "Tape,Paper. Gummed (Kraft)."?
For each test, three test specimens, each approximately
6 inches (152mm) long andnot greater than 0.025 square
inch (16 mm2) in cross-section, shallbe cut outof the test
6.5.2 The test shallbe made in a m m which is generally
sample
with a die.All three test specimens shall
be tested
free from drafts of air, although a ventilated hood maybe
and
the
results
averaged.
used if air currents do not affect the flame. One end
of a
test specimen having a length of approximately 22 inches 6.6.3 Elongation
(559 mm) shall be clampedin position at the upper end of
This test shall be conducted in accordance with 6.4.11
the chamber; for sizes 8 AWG and smaller, a 4-pound
and 6.4.12.
(1.8-kg) weight shall be attached to the lower end of the
6.6.4Brittleness Test
test specimen to keep it taut. A paper indicator shall be
applied to the specimen
so that the lower edge is 10 inches This test shall be conducted in accordance with ASTM
D 746, using SpecimenA.
(254 mm) above thepoint at witch theinner blue coneof
thetestflame is to be applied.Theindicatorshall be
COPYRIGHT National Electrical Manufacturers Association
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NEMA WC 5-1992
Page 50
ICEA S-61-402
ACCELERATED WATER ABSORPTION
6.7
TESTS
6.7.1
General
to NEMA Standards hblicaFor the test schedule refer
tion No.W C 54flCE.AT-26465, Plan E.
I
6-72
ELECTRICAL METHOD (EM-60)
Refer to "A Standards Publication No. W C
53/ICEA T-27-581.
6.7.3 Rescinded 5 12-1982.
6.7.4 Dielectric StrengthRetention
Twenty samples, each at least5 feet (ISmeters) long,
shall be cut from a reel or coil chosen at random. The
sample shall be either
14 AWG solid or 14 AWG stranded,
with a wall of insulation
as specified in Table3-1 or 3-3.
Ten identified samplesshall be immersed, except for the
ends, for 14 days in water at the specified temperature.
Immediately thereafter, all twenty samples shall be immersed, exceptfor the ends,in water at 20'C to 30'C for
1 hour. At least 3 feet (0.9 meters) of each sample shallbe
immersed.
After the 20 samples have been immersed, an ac test
voltage, starting at zero,
shall be applied across
the insulation and increased at the
rate of 500 volts per second until
breakdown occurs.
The dieiecmc strength retention shall be calculated as
follows:
B
Dieleceic strength retention, percent=
~ ~ 1 0 0
W hereB = Average breakdown voltage of the ten samples
immersed for 14 days at the specified temperature.
A = Average breakdown voltage of the ten samples
not immersed for14 days at the specified temperature.
6.8 THICKNESS OF COVERINGS
6.8.1NonmetallicTape
Nonmetallic tape when not bonded to the underlying
material, shallbe removed from not
less than 6 inches (1 52
mm) of the insulated conductor
or assembled core.
The thickness of thetape shal1 be determined by means
of a dial micrometer having a presser foot
0.25 inch (6.35
mm) kO.01 inch in diameter and exerting a total force of
3.0 M.1ounces ( 8 5 9 grams), the load beiig applied by
means of a weight. Five readings shall be attaken
different
points on h e sample, and the average of these readings
shall be taken as the thicknessof the t a p e .
COPYRIGHT National Electrical Manufacturers Association
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6.8.2 Metallic Shielding Tape or Steel Tape
Metallic shielding tape or steel tape shall be removed
from not less than 6 inches (152 mm) of the insulated
conductor or assembled core. The thickness of the tap
shall be measured by means aofmicrometer caliper having
flat surfaces onboth the anviJ and the endof spindle and
graduated to read diredy at least to mils, and preferably
to tenthsof a mil. Five readings shall
be taken at different
points on the sample, and the average of these readings
shall be taken as the thicknessof the tap.
6.8.3 Metallic Sheaths
Thethicknessofthesheath
shall be determined by
measurements made with a micrometer caliper having a
rounded anvil. The measurements shallbe made directly
on two specimens of the sheath removed from the cable,
one from each endof the reel length.At least five separate
measurements, approximately equally spaced around the
circumference, shall be made on each specimen, and the
average of all the measurements on the two specimens
of the sheath.
shall be considered as the average thickness
The minimum of all of the measurements obtained
be shall
considered as the minimum thicknessof the sheath.
Specimens of the sheath shall be free fromexternal
mechanical injury, notless than 3 inches (76.2 mm) long,
with the ends cut perpendicular to the axis, and shall be
taken before the cable
is shipped.
6.8.4 Jute Beddings and Servings
The thickness ofjute bedding under the armor shall be
determined by the use of a diameter tape and shall be
considered as h of the difference in the measurements
under and over
the serving. The measurement in each
case
shall be the average of five readings taken at different
points along the serving.
6.8.5 Thermoplastic CoveringsOver Metallic Sheaths
The minimum thickness of the covering shall
be determined by direct mesurement with a micrometer, a steel
scale with pocketglas, or a micrometer microscopeon a
ring of covering removed from the cable.
6.8.6 Thermoplastic Coverings Over Metallic Armor
The minimum and maximum thickness
of the covering
shall be determined directly with a micrometer, a steel
scale with pocket glass, or a micrometer microscope
on a
ring of covering removed from the cable. The averageof
these determinations shall betaken as the average thickness of the jacket.
6.9 ADDITIONAL TESTS
6.9.1 Environmental Cracking
Except as otherwise specifiedin 6.9.1.1 and 6.9.1.2, the
test shallbe made in accordance with AST" D 1693.
-~
~~
NEMA WC*5 9 2
m
ICEA S-61-402
64702470502792
Ob6
m
NEMA WC 5-1992
Page 51
two electrodes and the resistance shall be measured in
6.9.1.1 TEST SPECIMEN
accordance
withASTM D 257. The specific surface resisThe number and length of samples shallbe selected in
tivity
shall
be
calculated by the following formula:
accordance with6.4.5. Threetestspecimensapproximately 1.5 inch (38.1 mm) long,
0.5 inch (12.7 mm) wide
p=0.524RD
and 0.125 inch (3.18 mm) thick from each samplebeshall
Where"
molded from material taken from the completed cable. The
p = Specific surface resistivity.
be lowered at
temperature of the molded specimens shall
any suitable rate, A slit made with a razor blade, approxi-R = Surface resistancein megohms per6-inch spacing.
D = Cable diameterin inches.
mately 0.75 inch (19.0 mm) long and from 0.020
to 0.025
inch (0.51 to 0.64 mm) deep, shallbe centrally locatedon
6.9.3.3 U-BENDDISCHARGE
one of the 1.5 inchX 0.5 inch (38.1 x 12.7 mm) surfaces.
A sample of the completed cable shall be bent, in the
6.9.1.2 TESTPROCEDURE
form of a U, 180degreesaround a mandrelhavinga
diameter in accordance with Table 6-10.
The specimens shallbe bent with the slit on the outside
Table 6-1O
and placed in a test tube 200 millimeters long and 32
millimeters in outside diameter. The cracking agent (Igepal
Conductor Size,
Diameter of Mandrel as a Multiple of the
CO-630 madeby the GAF Corporation, or its equivalent)
AWG or kemil
Outside Diameter of Cable
shall be added to completely cover the specimen. The test
8-2
6
tube, suitably closedby means suchas foil-covered cork,
shall be placed in an oven at 50'C+loCfor 48 hours.At
1-3/0
8
the end of this period, the specimens shall be removed,
4D-500
10
allowed to cool to room temperature, and inspected for
cracking.
Over 500
12
6.9.2AbsorptionCoefficientTest
The sample shall be mounted with the apex of the U
The number and length of samples shall be selected
in
above
andin contact with a smooth metal plate and with
accordance with 6.4.5. Three
test specimens shallbe taken
less
the legsof the U perpendicular to the plate. After not
from each sample. One
test Specimen out of three shall be
tested and the other two specimens held in reserve, exceptthan 30 minutes nor more than45 minutes following the
that when onlyone sample Is selected in accordance with bending, a source of60-Hz ac potential of 125 volts per
mil of nominal insulation thickness shall be applied be6.4.5, all three test shallbe tested and the average of the
tween
the conductor and the metal plate. This potential
results reported. The absorption coefficient of polybe
maintained continuously for
at least 6 hours.This
shall
ethylene compounds shall be determined in accordance
test
shall
be
made
at
room
temperature.
with ASTM D 3349.
6.9.4 Volume Resistivity
6.9.3 Tests for Discharge-resisting Jackets
6.9.4.1 TESTSAMPLE
6.9.3.1
GENERAL
The samples shall be taken from the completed
No cable. One sample shallbe taken from each lot or from each
25000 feet of completed cable, whichever
is less.
sample shall be taken from the first 5000 feet (1524 meters). One sample shall be taken from the first 5001 to
6.9.4.2 CONDUCTORSTRESS CONTROL
20,000 feet (1524 to6096 meters) of eachcable constmcThe sample shall be cut in half longitudinally and the
tion and one additional sample for each additional 100,000
conductor removed.
four silver-painted electrodes shall be
feet (30,480 meters).
appliedtotheconductor stress controllayer. The two
6.9.3.2 SPECIFIC SURFACE RESISTIVITY
potential electrodes shall be at least 2 inches (50.8 mm)
A sample of the completed cable
of suitable length shall apart. A current electrode shall be placed at least 1 inch
(25.4 mm) beyond each potential electrode. When a high
be immersed, except for the ends, in water
at room temdegree of accuracy is not required, this test may
be made
perature for 48 hours.
At the end of this
period,the sample
with onlytwo electrodes spaced
at least 2inches (50.8 mm)
shall be removed from the water. The excess surface moisture shall be wiped off with blotting paper and the sample apart.
100 milliThe powerof the test circuit shall not exceed
allowed to remain at room temperature for 10 minutes.
watts.
The
test
shall
be
made
at
the
specified
temperature
Two 1-inch (25.4-mm) wide foil electrodes
shall be wound
with either acor dc.
around the cable surface with a 6-inch (152-mm) spacing.
A 250-500 volt dc potential shallbe applied between the
COPYRIGHT National Electrical Manufacturers Association
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ICEA S-61-402
NEMA WC 5-1992
Page 52
The volume resistivity shallbe calculated as follows:
2
2
R(D -d )
P = 1ooL
Wherep = Volume resistivity in ohm- meters.
R = Measured resistance in ohms.
D = Diameter over the conductor stress control layer
in inches.
d = Diameter over the conductor in inches.
L = Distance between potential electrodesin inches.
6.9.4.3 INSULATION SHIELD
Four silver-painted annular-ring electrodes shall
be a p
plied to the surface of the shield layer.The two potential
electrodes shall be at least 2 inches (50.8 mm) apart. A
current electrode shall be placed at least
1 inch (25.4 mm)
beyond each potential electrode. When a high degree of
accuracy is not required, this test may be madewith only
two electrodes spaced at least
2 inches (50.8 mm) apart.
The power of the test circuit shall not exceed
100 milliwatts. The test shallbe made at the specified, temperature
with either ac or dc voltage.
The volume resistivity shallbe calculated as follows:
p = 2R-
(D2-d2)
100 L
Wherep = Volume resistivity in ohm-meters
R = Measured resistance in ohm.
D = Diameter over the insulation shield layer in
inches.
d = Diameter over the insulation in inches.
L = Distance between the potential electrodes in
inches.
6.9.5StrippingTestforCableswithExtruded
Thermoplastic Insulation Shields
Test samples and specimens shall
be selected in accordance with Table6-4 and 6.4.6. The test specimen shall be
approximately 15 inches long, andall coverings over the
extruded insulation shield shall
be removed.
v2 inch
Startingat one end,two parallel longitudinal cuts
(12.7 mm) apart and not less than
12inches (305 mm) long
shall be made through the insulation shield.
The specimen
shall be rotated 180 degrees and two identical cuts shall be
made starting from the same end. Each %-inch
(12.7 mm)
strip shallbe p e e l e d back from the cut end for a distance
of 2 inches (50.8 mm).
The specimen shall
be mounted horizontallyin a testing
(50.8 mm) end
machine and secured
at each end. The 2inch
of the peeledstrip shallbe gripped in the testing machine
in such a manner that it can be pulled at an angle of 90
degrees to the cable axis.
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
Each strip shall be peeled from the cable at a constant
speed not exceeding'h inch (12.7 mm) per second for a
distance o€not less than10 inches (254 mm).
The angle of pull shallmaintained
be
as close as possible
to 90 degrees throughout the rest.
The tension necessaryto remove the strip shall be monitored continuously and the minimum value shall be recorded.
6.10 RETESTS
6.10.1 Physical and Aging Properties and
Insulation and Jacket Thicknesses
See 6.4 and the exceptions given 6.10.2.
in
If any test specimen
fails to meet the requirements
of any
of the following tests, either before
or after aging, that test
shall be repeated on two additional specimens takenfrom
the same sample:
6.4.3
Measurementof Thickness
6.4.11.3 TensileStrength
6.4.11.4 Elongation
6.4.12 Aging
6.4.14 Heat
Distortion
Failure of either of the additional specimens shall indicate
failure of the sampleto conform to thisstandard.
If the thicknessof the insulationor of the jacketof any
coil or reel is found to
be less than the specified value, that
coil or reel shallbe considered as not conforming to this
standard, and a thickness measurement on each of the
remaining coilsor reels shallbe made.
When 10 or more samplesare selected from any single
lot, all coils
or reels shall be considered
as not conforming
to thissmdard if more than10 percent of the samplesfail
to meet the requirements for physical
and aging properties
and thickness. if 10 percent or less fail, each coil or reel
shall be tested and shallbe judged upon the resultsof such
individual tests. Wherethe number of samples selectedin
any single lot is less than ten, dl coils or reels shall be
considered as not conformingto this standard if more
than
20 percent of the samples fail. If 20 percent or less fail,
each coilreel, or length shallbe tested and shall
be judged
upon the resultsof such individual tests.
6.10.2 Tests on Samples, Except Physical and
Aging Propertiesand Insulation and
Jacket Thicknesses
See6.10.1.
6.10.2.1 If allof the samples pass
all of the following tests,
the lotof cable which they representshall be considered as
meeting the requirements
of this standard.
6.4.13 HeatShock
6.4.15 ColdBend
6.5
Flame
Test
6.7
Accelerated Water Absorption
ICEA s-61-402
6.8
6.9
6.14
Thickness of Coverings
A d d i t i d Tests
Flexibility of Cormgated Armor
6.10.2.2 If any sample fails to pass any of these tests.the
length of cable from which the sample was taken shall be
considered as not meeting the requirements of the
test which
it failed, and another sampleshall be taken from -h of the
two other lengths of cable in the lot of cable under test If
either of the second samples failsto pass the test, the lot of
cable shallbe consideredas not meeting the requirements
of
this standard. If both such second samplespass the tesf the
lot of cable (except the length representedfirst
by sample)
the
shall be considered to meet the requirements of
this standard.
NEMA WC 5-1992
Page 53
The duration of the dc voltage test shall be 15 minutes
for cableswith insulation shield and 5 minutes for cables
without insulation shield.
6.11 .1.4 AC Spark Test
6.11.1.4.1 APPLICATION
This test shall apply to singleconductor cable and assemblies of single-conductor cables rated
O through 2000
volts.
This test shallnot apply to:
a. Multiconductor cables otherthan assemblies of single-conductor cables.
b. Cables with insulation shield.
c. Cables with metallic sheath or armor.
d.
Assemblies containing uninsulated conductors.
6.10.2.3 Failure of any sample shall not preclude
resame.
Cables rated above 2000 volts.
pling and retesting the length of cable from which the
original sample was taken.
6.11 .1.TEST
4.2 APPARATUS
Test
apparatus
shall consist
of:
6.11 TESTS ON COMPLETED
a
.
A
source
of
single-phase
ac potentialcapable of
CABLES
maintaining the required voltage under all normal
6.11.1 Voltage Tests
leakage current conditions.
b.
An electrode capable of maintaining contact,
6.1 1.1 .l General
its length, with theperiphery of thecable
throughout
These tests consist of voltage tests on each length of
under
test
completed-cable. Except for thedc spark test and the ac
c. A meansofmeasuringvoltage between electrode
spark test, the voltage shall be applied between the conand ground.
ductor or conductorsandthemetallicsheath,metallic
ci.
A means of indicating a fault (failure).
shield, metallic armor, or water, and the rate of increase
6.11.1.4.3 TEST PROCEDURE
test
fromtheinitiallyappliedvoltagetothespecified
voltage shall be approximately uniform and shall be not
One sideof thepotenual sourceshall be connected to the
more than 100 percent in 10 seconds nor less than 100
electrode and the other side
of the p o t e n d source shall be
percent in 60 seconds.
connected to ground. The conductor(s)in the cable shall
be tested to assure continuity when grounded
at one or both
6.11.1-2 AC Voltage Test
ends.
All
ground
connections
shall
be
bonded
(common).
This test shall be made withan alternating potentialfrom
The
fault
indicator
shall
be
connected
to
indicate
abnormal
a transformer and generator of ample capacity but,in no
current between elecnode and ground.
case, less than 5 kilovoltamperes.The frequency of thetest
After the s p e c i f i e d voltage is applied, the entire length
voltage shall be nominally between 25 and 60 hertz and
of
cable shallbe passed through the electrode
in a manner
shall have a wave shape approximating a sine wave as
and
a
t
a
speed
such
that
every
section
of
cable
surface will
closely as possible.
have maintained electrode contact for not less than 18
The initially appliedac test voltage shallbe not greater
positive and negative voltage crests.
than the rated ac voltage of the cable under test.
The maximum speed of the cable under test may be
The duration of the ac voltage test shallbe 5 minutes.
determined in either U.S. customary units or in metric
6.11.1.3 DC Voltage Test
equivalents as follows:*
a. U.S. Customary UnitsFormulaforDetermining
This test is applicable to cables without insulation shield
Maximum Speed ofCable
rated up through 5000 volts and to all cables rated 5001
volts and above and shall be made after the insulation
resistance testdescribed in 6.12. The equipmentfor the dc
MS=s/9~F~EL
or suitable
voltage test shall consist of a battery, generator
Wh e r e
rectifying equipment and shall
be of ample capacity.
MS = Maximum speed in feet per minute.
The initially applied dc voltage shall
be not greaterthan
F
= Frequency
in hem.
3.0 times the rami ac voltage of the cable.
EL = Electrodelength ininches.
COPYRIGHT National Electrical Manufacturers Association
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ICEA S-61402
NEMA WC 5-1992
Page 54
b.
EquivalentMetricFormula for Determining
Maximum Speed of Cable
"S='/lsoxFxEL
W hereMS = Maximum speed in meters per minute.
F
= Frequency in hertz.
EL = Electrodelengthinmillimeters.
6.11.1.4.4 FAILURE
Any indication by the fault indicator shall constitute a
failure.
6.1 1.1.5 DC Spark Test
This test is applicable to single-conductor cables and
assemblies of insulated single-conductor cables without
or metallic
insulation shield, and without metallic sheath
armor, rated O through 2000 volts. The equipmentfor the
dc spark test shall consistof a dc sparker of ample voltage
and a suitable electrode.The sparker shall be capable of
maintaining the specified test voltage under all noma1
conditionsof leakagecurrent The voltage shallbe applied
between the outside surfaceof the cable and the conductor(s) fornot less than 0.05 second. The conductor(s) shall
be grounded.
The electrodeshall make contact with
the entire exposed
surface of a single-conductor cableand of an assembly of
twisted single-conductor cables.
Where an assembly of twisted singleconductor cables
is subjected to the dcspark test, the individual conductors
shall be similarly tested priorto assembly.
6.11.2 Cables Without Metallic Sheath, Metallic
Shield, or Metallic Amor
Except for the & spark test (see 6.1 1.1.5) and the ac
spark test (see 6.11.1.4), single-conductor cables of this
type whichare twisted together into
an assembly of two or
more conductors without an overall jacket or covering
shall be immersed in water for at least 1 hour and tested
while still immersed, all other singleconductor and multipleconductor cables of this type shall be immersed in
water for atleast 6 hours and tested while still immersed.
Each insulated conductor shallbe tested against all other
conductors connectedto the grounded watertank.
6.11.3 CableswithMetallic
Sheath,Metallic
Shield, or Metallic Armor
All cables of this type shall be tested with the metallic
sheath, shield or armor grounded, without immersion in
water, at the test voltage specified. For cables having a
metallic sheath, shield or armor over the individual conductor(s), the test voltage shall be applied between the
insdated conductor(s) and ground.For multiple-conductor cables with nonshielded individual conductors having
a metallicsheath, shield or armor over the cable assembly,
COPYRIGHT National Electrical Manufacturers Association
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the test voltage shall be applied between each insulated
conductor and all other conductors and ground.
6.11.4 Voltage Tests After Installation
If voltage tests are made after installation, they shall
bemade immediately. The test voltage shall be a dc voltage
as given in Table 6.1 1 or 6-12 and shall be applied in
accordancewith6.11.1.1 and6.11.1.3.
Table 611
DC TEST VOLTAGE AFTER INSTALLATION FOR
POLYETHYLENE-INSULATED
POWER CABLES
Rated C h i t Conductor
Test Voltage, LV
25
2001-5000
8-1000
25
35
5001-8Ooo
&loo0
2-1000
15001-25000
1-IO00
35
55
80
25001-28000
1-looO
85
28001-350001/0-1oOO
100
8001-15000
65
100
...
...
Table 6-12
DC TEST VOLTAGE AITER INSTALLATION
FOR THERMOPLASTlClNSULATED
*
C h i t Vdtaee Vdts
ConductorS k e AWG MVdtpee kV
Polyvinyl-ChlorLIelnsulatedCablrs
0-5000
8 4
25.0
Pdyvingl-chlorlde-llated Cables
3001-6000
8 4
2s
6001-9000
8-4
45
6.12
INSULATION
RESISTANCE
6.12.1 TestApparatus
Thetestapparatusshallconsist
of asource of
constantpotentialfrom100to
500 voltsandsuch
other apparatusas is listed in ASTM D 257.
6.12.2 TestProcedure
Singleconductorcablesshallbetestedbetween
the conductor and metallic sheath or water. Multiple
conductorcables with nonshieldedconductorsshall
betestedbetweeneachconductorandallother
conductorsandsheath or water.Multiple-conductor
cables with shielded
conductors
shall
be
tested
betweentheconductorandshield.Theconductor
under test shall be connected to the negative terminal
of the test equipment and readings shall be taken after
an electrification of 1 minute.
ICEA S-61402
Eachcoil,reelorlength
of wireorcableshall
have an insulation resistance in megohms-1000 feet at
a temperature of 15.6"C (60°F) of not less than the
value ofR calculated as follows:
WhereR = Insulation resistance in megohms- 1000 feet.
K = Constant for the grade of insulation.
(See Part 3)
D = Diameter over the insulation.
d = Diameter under the insulation.
If thetemperatureatthetime
of measurement
differs from 15.6"C (60"F), the insulation resistance
shallbecorrected
to that
at
15.6"C
(60°F)
by
multiplying
the
measured
value
by
the
proper
correctionfactorgiveninTable6-13,usingthe
coefficient(see6.12.3)fortheparticulargradeof
insulation
and
temperature
question.
in The
temperature of the water shall be not less than 10°C
(50°F)nor more than29.4"C (85°F).
6.12.3 Determination of Temperature Correction
Factors for Insulation Resistance
Three samples. preferablyof 14 AWG solid wire with a
45-mil (1.14-mm) wall of insulation, shall be selected as
representative of the insulation under consideration.The
samples shall be of sufficient length to yield insulation
resistance values under 25000 megohms at the lowest
water bath temperature.
The three samples shall be immersed in a water bath
equipped with heating, cooling and circulating facilities,
with the endsof the samples extendedat least 2 feet (0.6
NEMA WC 5-1992
Page 55
meter) above the surface of the water and properly prepared for minimum leakage. The samples shall be left in
the water at m m temperature for16 hours before adjustto 1O'C or before uansfening the
ing the bath temperature
samples U, a 1O'C test temperature bath.
of the condwcx shall be measuredat suitable
The miintavals until it remains unchanged forat least 5 minutes.
insulati0nwillthenbeatthewnpaarurr:ofthebathasreadon
the baththermometer. Insulation resisrance shall then be measured in accordance with 6.122.
Each of the three samples shall
be exposed to successive
water temperaturesof lO'C, 16'C, 22.C 28.C and 35'C
and, returning, 28'C. 22'C. 16'C, and 1O'C. Insulation
resistance readingsshall be taken at each temperature after
equilibrium has been established.
The two sets of readmgs takenat the same
temperature shall
be averaged and, together with the readmg at 35'C,
ploned
on semi-log paper.The insulation resistance valueat 15.6'C
(WF'shall
) be read from theplot
The 0.55'C (1'F) coefficient shall be calculated by dividmg the insulation resistanceat 15.6.C (WF)
by that at
16.1 'C (61'F).
6.13 PARTIAL DISCHARGE TEST PROCEDURE
Refer to ICEA Publication T-24-380.
6.14 METHOD FOR FLEXIBILITYTEST FOR
CONTINUOUSLY CORRUGATED ARMOR
A suitable lengthof armored cable with jacket removed,
if any, shallbe bent in a U bend around a mandrel having
a diameter equal to not greater than 14 times the cable
diameter with sufficient tensionso it conforms closelyto
the periphery of the cylinder, straightened. and then bent
180 degrees in the
reverse direction completing one cycle.
The rate of bend shall be such that the test is completed
within 1 minute. The test is performed at room temperature.
INSPECTION FOR EVIDENCE OF
WATER
A visual inspection for evidence of water shall
be performed at the timeof preparing the cable ends
for voltage test on completed cablein accordance
with Section 6 .
6.15
COPYRIGHT National Electrical Manufacturers Association
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NEMA WC 5-1992
Page 56
ICEA S-61-402
Table 6-13
TEMPFRATURE CORRECllON FACTORS FOR INSULATION RESISTANCE TO15.6C (60'Fl
Coefficient for 1'F
lkmperaillre
'F
'C
1.03
1.04
1.os
1.O6
1.07
1.08
1.o9
1.10
tll
1.U
50
10.0
0.75
0.68
0.62
0.56
0.5 1
0.46
0.42
0.38
0.35
0.32
51
52
53
54
55
10.6
11.1
11.7
122
12.8
0.77
0.79
0.82
0.84
0.87
0.70
0.73
0.76
0.79
0.82
0.65
0.68
0.71
0.75
0.78
o59
0.63
0.67
0.70
0.75
O54
058
0.62
0.67
0.7 1
050
O54
0.46
0.50
O58
0.63
0.68
0.55
0.60
0.65
0.42
0.47
0 51
056
0.62
0.39
0.43
0.48
0.60
0.36
0.40
0.45
0 51
0.57
56
57
58
59
60
13.3
13.9
14.4
15.0
15.6
0.89
0.92
0.94
0.97
1-00
0.86
0.89
0.93
O.%
1
O
.O
0.82
0.87
0.91
O.%
1-00
0.76
0.84
0.90
0.95
1.o0
0.76
0.82
0.88
0.94
1
O
O
.
0.74
0.80
0.86
0.93
1.o0
0.71
0.78
0.85
0.92
1.o0
0.69
0.76
0.83
0.9 1
1.o0
0.66
0.73
0.82
0.09
1.o0
0.64
0.7 1
0.80
0.89
1.o0
61
62
63
64
65
16.1
16.7
17.2
17.8
183
1.O3
1.o6
1.o9
1.13
1.16
1.o4
1.O8
1.13
1.17
122
1.05
1.10
1.16
1.22
1.28
1.o6
1.13
1.19
1.26
1.34
1.O7
1.15
1.23
1.3 1
1AO
1.O8
1.17
126
136
1.47
1.09
1.19
1-30
1.41
1.54
1.10
1.21
134
1.47
1-62
1.11
124
1.38
153
1.70
1.12
127
1.42
158
1.78
66
67
18.9
19.4
68
20.0
69
70
20.6
21.1
120
123
127
1.3 1
135
1.27
1.32
1.37
1.43
1.48
1.35
1.41
1.48
1.55
1.63
1.42
151
1.60
1.69
1.79
150
1.62
1.72
1.84
1.97
159
1.72
1.85
2.00
2.17
1.69
1.84
1.99
2 18
238
1.78
1.%
2.15
236
2.60
1.88
2.09
2 31
257
2.85
1.98
221
2.48
2.77
3.10
71
72
73
74
75
21.7
222
22.8
23 3
23.9
139
1.43
1.47
152
156
154
1
1.67
1.74
1.80
1.72
1.80
1.89
1.98
2.08
1.W
2.02
2.14
227
2.40
2.1 1
226
2.42
258
2.76
234
253
2.72
2.94
3.18
259
2.82
3.08
3.35
3.65
2.87
3.15
3.46
3.81
4.19
3.17
352
3.90
4.3 1
4.78
3.46
3.90
4.37
4.88
5.47
76
1.61
1.66
1.71
1.76
1.81
1.87
1.95
2.02
2.11
2.19
2 19
2.4 1
253
2.66
254
2.70
2.86
3.03
321
2.96
3.17
339
3.62
3.87
3.43
3.70
4.00
433
4.67
3.98
78
79
80
24.4
25.0
25.6
26.1
26.7
4.34
4.73
5.16
5.61
4.61
5.08
559
6.14
6.72
5.30
5.88
6 51
727
8.07
6.12
6.85
7.68
859
9.65
81
82
83
84
85
272
27.8
28.3
28.9
29.4
1.87
1.92
1.98
2.04
2.10
2 3
2.37
2.47
257
2.67
2.80
294
3.08
3.23
3.40
3.40
3.60
3.82
4.O5
4.30
4.15
4.43
4.72
5.04
5.42
6.12
5.04
5.45
6.69
5.89
7.28
6.35
7.92
6.84 10.8 8.67
n
.a
2.30
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
7.43
8.18
9.00
9.90
O54
8.98
9.92
11.0
122
135
10.8
12.1
13.6
15.2
17.0
ICEA S-61-402
NEMA WC 5-1992, Revision 1
Page 57
Part 7
CONSTRUCTIONS OF SPECIFIC TYPES
The requirementsof Parts 1 through 6 shall be met exceptas othenvise modifiedin Part 7.
7.1 POLE ANDBRACKETCABLE
strengthandelongationafter 168 hoursloO'C+l
at
"C
shall
be
not
less
than
85
percent
of
the
unaged
values,
and
the
7.1.1 Scope
cold
bend
test
shall
l
x
conducted
at
-3O'd'C.
This section appliesto flat-twin pole and bracket cable
insulated with polyvinyl chloride and belted with polyeth-7.1.3.2 The average thicknessof the insulation shall be
ylene. This cable
is intendedfor use in series street lighting not lessthan that givenin Table7-2. The minimum thickcircuits inboth interior and exterior installations for opera-ness shall be not less than 90 percent of the values given
tion at temperatures not exceeding 75°C. The conductor
in the table. The thickness shall be measured in accordance
sizes covered are 10,8, and 6 AWG. The insulation and
with 6.4.3.
belt thicknesses are based on a maximum of 600 volts
7.1.3.3 One conductor shall be colored black and the
between conductors and on open circuit voltages from
3001 to 9000 volts.
other white or natural.
7.1.2
Conductors
7.1.4 ConductorAssembly
The two insulated conductors shallbe laid flat andpar7.1.2.1 Theconductorsshall be of annealeduncoated
allel.
copper or annealed coated copper and shallmeet the re7.1.5
Belt
quirements of 2.1.1 and 2.3.
7.1.2.2 The sizes,minimum number of strands, average
cross-sectional arm and approximate diameters of the
conductors shallbe as shown in Table 7- 1.
The area of cross-section of any conductor shallbe not
of the area given in Table 7-1.
less than 98 percent
7.1.3
Insulation
7.1 5 1 The belt shall be a heat- and light-stabilized black
polyethylene insulation and shall meet the physical and
as given in
aging requirements for polyethylene insulation
3.9.1. It shall be applied
a flat
in configuration. Fillers shall
not be used. The belt insulation shallfill the intersticesof
the cable.
7.1.5.2 The average thickness
of the belt shallbe not less
than that given in Table
7-2. The minimum thickness shall
be not lessthan 90 percent of the values given in the table.
Table 7-1
CONSTRUCTION OF CONDUCTORS
7.1.3.1 The polyvinyl chloride insulation shall meet the
requirements given in3.7,except that both the tensile
Approximate Diameter
Size, AWG
i
Average Cross-sectionalArea,
Minimum
Number of
Strands
Conductor
CM
per
10
19
8
6
19
16,510
3.76
19
26,240
4.72
A
N
D
2.97
R
E
M
E
N
Minor
Voltage,
Conductor
Volts
Size,AWG
Insulation
Major
mils
mm
Minimum Outside Diameter
Belt
mils
mm
10
13 10.20.40015.595
0.6102.41
35
81.14 1345 10.9 0.430 17.0 95
0.670 2.41
635
13
60 12.7
1.520.50020.695
0.8102.41
ml-9ooO
10
8
6
46
O. 148
O. 186
Table 7-2
T
S FOR POLE AND BRACKET CABLE
30016000
1.14 45
45
110 1.14
45 1.14
1.52
mm
0.117
10,380
Thickness
upen-cucurr
inches
inches
mm
2.79 19 10.9
0.640
0.43016.3
110 2.79
0.700
17.8
110 2.79
0.840 21.3
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
inches mm
Test Voltages, kV
AC
Dc
5 Min
15 Min
35
0.46011.7
0.53013.5
19
19
55
55
55
NEMA WC 5-1992, Revision 1
Page 58
ICEA S-61-402
7.1.6
Tests
The cable shall be tested
in accordance withPart 6 and
shallmeettherequirementsspecified
in7.1 except as
otherwise specifiedin 7.1.6.1 through 7.1.6.4.
on single-phase primary underground residential
dismbution systems operating at 2001 to 35000 volts phase-tophase 100percentinsulationlevel.
For ampacities, see
Appendix F.
7.1.6.1 The completed cable shall withstand the following voltage tests after being immersed in water atfor
least
6 hours.
7.5.2CentralConductor
Central conductors shall be annealed copperor aluminum. The minimum conductor size shall be in accordance
with Table7-5.
7.1.6.2 An ac test voltage of 3000 volts shall be applied
between conductors for5 minutes.
7.1.6.3 The conductors shallbe connected together, and
the ac and dc test voltages given in Table 7-2 shall be
applied between the conductor and water.
Table 7-5
MINIMUM CONDUCTOR SIZE
Rated Voltage Phase-&Phase,
VdtS
Minimum Conductor Size,
AWG
2001-15000
4
7.1.6.4 COLD BEND TEST
15001-28000
1
The polyethylene beltshall not show any cracks when
conditioned and tested in accordance with 6.4.15.1. The
1P
28001-35000
cable shall be bent around its minor axis. The insulated
conductor h e t e r given in 6.4.15.1 shall be taken as the
minor axis of the cable. Crackmg
of the polyvinyl chloride 7.5.2.1 COPPER
or
insulationon the individual conductors under this test shall The conductor shall be (1) annealed uncoated copper
annealed coated copper
in sizes 4 through 4/0
AWG either
not constitute failure.
Class B or C stranded, or (2) uncoated copper, compact
7.1.7OutsideDiameters
Part 2.
stranded. in accordance with
The outside diametersof the completed cable shall be
7.5.2.2 ALUMINUM
not less than that given in Table 7-2, with a tolerance of
Theconductorshallbealuminum
1350 eithersolid
+10 percent.
(through
4/0
AWG),
Class
B
or
C
stranded,
or compact
7.1.8BendingRadius
stranded, in accordance withPart 2.
The minimum radius to which these cables may be bent
7.5.2.3 CONDUCTOR STRESSCONTROL
around their minor axisin service is 2 inches(50.8 mm),
LAY ER
with a maximum of '/z turn (180-degree U bend).
The conductor shall be covered with a
stress control
7.1.9
Terminations
layer in accordance withPart 2.
Suitable high-temperature terminations are recom7.5.3
Insulation
mended where the cable will be exposed to temperatures,
The shielded central conductor shall be insulated with
in close proximityto the luminaire, in excess of75°C.
polyethylene which meets the requirements of 3.9. The
7.2Rescinded5-28-1981.
average thickness of the insulation shall be not less than
that given in Table
3-2 for 100 percent insulation level. The
7.3Rescinded12-7-1993.
minimum thicknessshall be notless than 90 percent of the
Table 7-3 and Table 7-4 are deleted.
values given in the table.
7.4CONTROLCABLES
7.5.4InsulationShieldingandProtective
See NEMA Publication No. WC 57 (ICEA Pub. No.
Covering
S-73-532).
A layer of conducting nonmetallic material meeting the
7.5CONCENTRICNEUTRALUNDERGROUND
requirements of 4.1.1 shall be extruded directly over the
RESIDENTIAL DISTRIBUTIONCABLESinsulation to serve as both an electrostatic shield and a
POLYETHYLENE INSULATED
of the extruded insulaprotective covering. The thickness
tion shielding at any location when measured
on com7.5.1
Scope
pleted cable shall be
in accordance with Table76.
This sectioncoverstwo-conductorconcentric-neutral
The conducting layer shall be compatible with the insupowercablesconsistingofonepolyethylene-insulated
lation
and shall be legibly identified
as being conducting.
central conductor and the copper concentric conductor
applied helically overall. These cables are intended
usefor
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
A
NEMA WC 5-1992, Revision 1
Page 59
ICEA S-61-402
Table 7-6
FOR CABLES WITHOR
WITHOUT OVERALL JACKET
Insulation Shield Thickness
Calculated
Minimum
Insulation
Diameter, Inches
Point, inch*
1.O00 or less
0.030
0,070
0.015
1.001-1.500
0.040
0.055
0,055
0.085
0.015
0.100
0.020
0.115
0.020
1.501-2.ooO
2.001
larger
and
Maximum
Maximum
Point, inch Indent, inch
*NOTE-The minimum point does not apply to locations under the
metallic shield indent.
7.5.5 ConcentricConductor
The overall concenmc conductor shall consist
of a number of copper wires meeting the chemical requirements
of
ASTM B 5 and resistivity, tensile and elongation requirements of ASTM B 3 for uncoated wires,ASTM B 33 for
tin-coated wires or ASTM B 189 for lead-alloy-coated
be not
wires. The number of wires aofspecified size shall
less than that given in Table7-7 for cablesused in singlephase systems.
The nominal diameters and circulararea
milof the wires
in Table 7-7 shall be as follows:
wires given in Table 7-8 times the appropriate nominal
circular mil area tabulated above.
The wires of the concenmc conductor shallbe applied
directly over the conducting material given
in with a
7.5.4
lay of not less than
six nor more than10 times the diameter
over the concentric wires.
7.5.6 Optional Jackets Applied OverA
Concentric Conductor
The jackets shall be either nonconducting
or conducting
dependingupon installation requirements.Ifnonconducting compoundis used, it shallmeet the physical and aging
requirementsof 4.3.2.1 through 4.3.2.3 as applicable.
If conducting compoundis used, it shall meet the physicaland aging requirements
of Table 7-8.
Table 7-8
PARTIAL-DISCHARGE LEVEL
Rated C h i t Voltage,
Phase to Phase, Volts
Minimum ParW-Discharge
200 1-5000
5
5001-8000
7
8001-15000
13
15001-25000
22
Extinction Level, kV
AWG Size
Diameter, Inches
Area, kcmil
25001-28000
25
14
0.0641
4.11
28001-35000
31
12
0.0808
6.53
10
0.1019
10.38
13.09
o. 1144
CAUTION-Cable users should be aware that some
types of jackets may alter the physical and electrical char-
acteristics of cable
the
components.
7.5.6.1 EXTRUDED-TO-FILLTYPE JACKET
The individual wires comprising a given concentric con- The jacket material shall cover the concentric conductor
ductor may V a r Y 6 percent in diameter from theaPProP*- and frll the
spaces between wires. The jacket material shall
be in contact with the insulahm shielding, but shall strip
ate nomild Valuegiven above, butthe t O d C k l l h I mil
area ofthe specified concentric conductor shall be at least freely.
98 percent of the product of the appropriate number of
9
Table 7-7
FULL NEUTRAL CONCENTRIC CONDUCTOR
Concentric Conductor, Minimum Number d W h
Insulated Conductor Size, AWG or kaun
Copper
Aluminum
...
4
4
3
2
1
2
1
110
2/0
310
410
1P
2P
3P
4m
250
350
14AWG
12 AWG
10 AWG
...
...
...
6
10
13
16
20*
...
10*
13
...
...
25*
32*
16
20*
25*
32*
10*
13
16
20*
...
...
+Altemale constructions
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
...
...
9 AWG
...
...
...
...
...
...
10*
13*
16
NEMA WC 5-1992
Page 60
ICEA S-61-402
When measured over the wires. the average
jacket thickness shall be not less than the appropriate value givenin
Table 7-9.
Table 7-9
JACKET THICKNESS AND TEST VOLTAGE
Calculated
Diameter
Average
AC
Spark-Test
Concentric
over
Jacket
Conductor
Thickness
inches
inches
Voltage
@V)for NonConducting Jackets
kV
1SOO or less
0.050
4.5
More than 1.500
0.080
7.O
SPARK TEST FOR NONCONDUCTING
JACKETS
A nonconducting jacket over concentric neutral conductors shall withstand an alternating current
spark test voltage. The voltage for extruded-to-fill
type jackets is given
in Table 7-9. The voltage for overlaying
type jackets is in
accordance with 4.3.7. The voltage shall be applied between an electrode at the outside surface
of the jacket, and
the concentric neun-al conductor shall be connected to
ground during thetest. The spark test shallbe conducted
7.5.6.4
inaccordancewith6.11.1.4.3and6.11.1.4.4.
7.5.7 Tests
The cable shallbe tested in m r d a n c e with Part 6 and
shall meet the requirements specifiedin 7.5. The partialdischargeextinctionlevel shall be inaccordancewith
The minimum thickness over the wires shall
be not less
than 80 percent of the specified average thickness.
Table 7-10. The electrical requirement
tests shall be made
After a jacket has been applied, theof theextruded
indent
without immersion in water.
insulation shield caused
by the metallic shield shall not
be
more than the specified maximum indent value found in
Table 7-1O
Table 7-6.
PROPERTIESOF THERMOPLASTIC
CONDUCTING JACKETS
7.5.6.2 OVERLAYING TYPE JACKET
If anonmetallictapeisappliedovertheconcentric
Physical Requirements
is conducting, then
conductors of the cable and the jacket
the tape shall be conducting. When the jacket is noncon- minimurn
Strength,
Tensil
psi
1200
ducting, the tape shall be either conducting or nonconElongation at rupture, minimum percent
100
ducting. A conducting tape shall be clearly identified as
Aging Requirements
being conducting.
The average jacket thickness when measured over the
After air oven aging at 100°C k 1'C for 48 hrs
wires shall be not less than specified in Table 4-5. The
Tensile strength, minimum percent
of unaged
minimum thickness at any pointshall be not less than 80
value
percent of the specified average thickness.
After a jacket has been applied, the indent of the extruded
Elongation at rupture,
minimum
percent
100
insulation shield caused
by the metallic shield shall not
be
.Heat Distortion, maximum percent -Air oven
more than the specified maximum indent value found in
at 90'C f 1'C
25
Table 7-6.
Volume Resistivity-At room temperature
7.5.6.3 IDENTIFICATION
(23'C fTC)and W C k 1'C. ma.meterohms
100
When aconductingmaterial is usedfortheoverall
Brittleness
Temperature, *C,not
warmer
than
-10
jacket, the cable legend shall identify the material as being
conducting.
~
PAGES 61 TO 64 DELETED, REVISION 1
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
ICEA s-61-402
NEMA WC 5-1992
Page 65
Part 8
Appendices
Appendix A
ABBREVIATIONS AND SYMBOLS
ac
AWG
BWG
C
dc
F
dm
Hz
kcmil
kg
km
W m
kV
MPa
mm
psi
%
f
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
alterdngcmnt
American wire gauge
Birmingham wire gauge
Celsius (centigrade)
direct current
Fahrenheit
grams per meter
hertz (electrical fkequencyin cycles per second)
thousands of circular mils (formerlyMCM)
kilogram(s)
kilometer@)
kilonewton per meter
kilovolt(s)
megapascal
millimeter(s)
pounds per square inch
percent
plus or minus
NEMA WC 5-1992
Page 66
ICEA S-61402
Appendix B
REPRESENTATIVE TENSILE STRENGTH AND ELONGATION
OF
NONMAGNETIC METALS
lknsile Strength
Metal
Aluminum
Ambrac
Low Brass
Commercial Bronze
copper
Monel
Stainless Steel
Zinc
Pd
MPa
13,00045,000
50,000-70,000
40,000-50,000
35,00042,000
35,000-50,000
75,000
82,000-90.000
20.000
90-310
345482
276-345
241-289
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
241-345
517
565-620
138
Elongation 2-h& (50.8
mm) Length,Percent
15-45
2040
40-50
40
1-35
45
50
60
NEMA WC85 92
6470247 0502808 253
NEMA WC 5-1992
Page 67
lCEA S-61402
Appendix C
DEFINITIONS FOR MAXIMUM TEMPERATURE OF CONDUCTORS
IN INSULATED WIRE AND CABLE
C1.l
MAXIMUM
CONDUCTOR
C1.3
TEMPERATURE-OPERATING
TURE-WORT
MAXIMUM
CONDUCTOR
TEMPERACIRCUIT
The highestconductortemperatureattainedbyanypartThehighestconductortemperatureattainedbyany
part
of the cableline under operatingcurrentload.
of thecablelineduringashortcircuit
of specifiedtime and
C l .2
MAXIMUMCONDUCTOR
TEMPERATURE-EMERGENCY
OVERLOAD
The highest conductor temperature attained by any part
of the cable line during emergency overloadof specified
time, magnitude,and frequency of application.
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
magnitude.
NEMA WC 5-1992
Page 68
ICEA S-61-402
Appendix D
EMERGENCY OVERLOAD RATINGSFOR THERMOPLASTIGINSULATED CABLES
Maximum TemperatureRating of Insulation, "C
60
Vdtage Rating, Volts+
75
Maximum Emergency Overload lkmperatuw "C
0-2000
85
95
2001-5000
...
...
9s
90
5001-35000
*Polyvinyl-chloride-insulatedcondudon for power cablesare rated 600 volta and less.
Opration at these emergency overload temperatures shall ot exceed 100 hours in any
than 500 hours during the lifetime of the cable.
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
12 consecutive months nor more
STD.NEMA
WC 5-ENGL
1992
= 6470247
05337b3 288
ICEA-61-402
NEMA WC 5-1992
Page 69
Appendix E
REFERENCED PUBLICATIONS AND STANDARDS
El .1
ICEA PUBLICATIONS
P-46-426/IEEE Std. 135 (SH007096)
Power Cable Ampacities'
T-24-380, rev. 12/80
Guide for Partial-Discharge
Test
El .2
Procedure'
ASTM STANDARDS3
A90-81 (1991)
Standard Test Method for Weightof Coating on Zinc-Coated
(Galvanized)Iron or Steel Articles
B 1-90
Standard Specrficationfor Hard-Drawn Copper Wire
B3-90
Standard Specification for Soft or Annealed Copper Wire
B549
Standard Specificationfor Electrolytic Tough-Pitch Copper
Refinery Shapes
B8-90
Standard Specification for Concentric-LaystrandedCopper
Conductors, Hard, Medium-Hard, or So$
B29-79 (1984)
Standard Specificationfor Pig Lead
B33-8 1 (1985)
Standard Specification for Tinned Soft or Annealed Copper
Wirefor Electrical Purposes
B 172-90
Standard Specification for Rope-Lay-Stranded Copper
Conductors Having Bunch-Stranded Standard Specification
for Members, for
Electrical Conductors
B 173-90
Standard Specification for Rope-Lay-Stranded Copper
Conductors Having Concentric-Stranded Members, for
Electrical Conductors
B 174-90
Standard Specificationfor Bunch-Stranded Copper
Conductors for Electrical Conductors
B 189-90
Standard Specificationfor Lead-Coated and Lead-AlloyCoated Soft Copper Wirefor Electrical Purposes
B 193-87
Standard Test Methodfor Resistivity of Electrical Conductor
Materials
B229-90
Standard Specification for Concentric-Lay-Stranded Copper
and Copper-Clad Steel Composite Conductors
B230-89
Standard Spec$cation for Aluminum-Alloy 1350-H19 Wire,
for Electrical Purposes
B23 1-90
Standard Specification for Concentric Lay-Stranded
Aluminum Alloy 1350 Conductors
8232-90
Standard Specificationfor Concentric-Luy-Stranded
Aluminum Conductors, Coated Steel-Reinjorced (ACSR)
B233-85
Standard Specr9cation for Aluminum 1350 Drawing Stock for
Electrical Purposes
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
~~
STD.NEMA WC 5-ENGL 1972
b470247 0533762 114
ICEA S-61-402
NEMA WC 5-1992
Page 70
B397-85
Standard Speciflcationfor Concentric-Lq-Stranded
Aluminum-Alloy 5005-Hl9 Conductors
B399-86
Concentric-Lay-Stranded Aluminum-Alloy 6201-T81
Conductors
B400-86
Compact-Round Concentric-Luy-Stranded Aluminum I350
Conductors
B496-90
Compact-Round Concentric-Lay-Stranded Copper
Conductors
B609-85
Aluminum 1350 Round Wire, Annealed and Intermediate
Tempers, for Electrical Purposes
D257-91
Standard Test Methodfor DC Resistance or Conductance of
Insulating Materials
D412-87
Standard Test Methodfor Rubber Properties in Tension
D471-79 (1991)
Standard Test Methodfor Rubber Property-Effect of Liquids
D746-79 (1987)
Standard Test Methodfor Brittleness Temperature of Plastics
and Elastomers by Impact
D1248-84(1989)
Standard Specificationfor Polyethylene Plastics Moldingand
Extrusion Materials
D1693-70 (1988)
Standard Test Methodfor Environmental Stress-Cracking of
Ethylene Plastics
D3349-86
Standard Test Methodfor Absorption CoefJicientof Carbon
Black Pigmented Ethylene Plastic Film
D8-96a
Standard Methods of Tension Testingof Metallic Materials
D l .3
NEMASTANDARDSPUBLICATION
WC 26-1984
Wire and Cable Packaging
'Copies may be obtained from IEEE. 445 Hoes Lane. Piscataway, NJ 08855-1331
South Yarmouth, MA 02664
2Copies may be obtained from ICEA. P.O. Box
'Copies may be obtained from ASTM,100 Barr Harbor Drive, West Conshohocken,PA 19428
440.
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
NEMA WC*5
m 6470247
92
0502812 784
m
ICEA S-61-402
NEMA WC 51992
Page 71
Appendix F
AMPACITIES FOR TWO-CONDUCTOR CONCENTRIGNEUTRAL SINGLE-PHASE
PRIMARY UNDERGROUND RESIDENTIAL DISTRIBUTION CABLES (SEE PART
7)
coaductorsize,
AWC or kann
Aluminum
Copper
In Burled
In
Ah++
Duct+
Buried+
In Dud
In Ah++
D M
In Burled
In
Burled+
Duct+
Air++
In Duct
In Ah*+
88
90
76
115
100
116
132
131
150
120
139
160
172
195
226
252
287
186
211
247
278
3 19
Cables Rated 5 kV W'C
132169
193
174 219
249
284
226
4
3
2
1
1P
324
368
291
425
2/0
3P
4P
250
...
300
97 111
111
128
126 144
199165 144
188
163
114
132
152
174
200
217
189
247
215
288
233
268
3 16
250
...
...
... ...
...
...
...
...
256
335
370
418
...
...
149
170
197
219
250
Cables Rated 15 kV W'C
120
138
181
208
240
278
324
116
4
132
3
2
171
1
1/0
194
162
186
210 150 158 119 125 103 131
240
273
2/0
224
3/0
255
4P
293
250
300...
313
358
410
...
...
...
79 91
95
177
176
201
218
257
1
324
...
154
248
190
284
...
...
...225
...29
...
...
...
168
360
285
403
254
*Ambient t e m p e r a t u r e of WC;100 percent load factor; thermal resistivity RHO-90
**Ambient t e m p e r a t u r e of WC; 30 to 100 percent load factor.
The multiplying correction factors for load factors of 75 and 50 percent shall be:
Rating of Cab14 kV
Correction Factors
50 Percent Load Factor
75 Percent Load Factor
Cable Only
In Duct
.o4
5
1.o9
1
15
1.O81.16
1.04
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
Cable Only
In Duct
1.16
1.O7
1.O7
NEMA WC 5-1992
Page 72
ICEA S-61-402
Appendix G
SHIELDING
G1.l DEFINITION OF SHIELDING
G1.l.l Shielding of an electric power cableis the practice of confining the dielectric field of the cable to the
insulation of the conductor or conductors. It is accomplished by means of a conductor stress control layer and
an insulation shield.
G2.1 FUNCTIONS OF SHIELDING
fined by such conducting film
so that the charging current
is carried by theength of
air,a discharge will occur, causing
ozone formation.
G3.1.3 The ground may be either a metallic conduit, a
damp nonmetallic conduit or metallic binding
tapeor rings
on an aerial cable,a loose metallicsheath, etc. Likewise,
damage to nonshielded cablemay result when the surface
of the cable
is moist, or covered with
soot, soapy grease t
x
G2.1.1 A conduction stress control layeris employed to
other conducting film and the external field
is partly conpreclude excessive voltagestress on voids between confined by suchconducting film so that the charging current
ductor and insulation. To be effective, it must adhere to or is carriedby theards of shock should have
a resistance low
remain in intimate contact with the insulation under all
enough to operate protective equipment
in case of fault. In
conditions.
some cases, the efficiency of protective equipment may
require proper size ground wires
as a supplement to shieldG2.1.2 An insulation shield hasa number of functions:
ing. The same considerations apply to exposed installa1. To confine the dielectric field within the cable,
tions where cables may be handled by personnel who may
2. To obtain symmetrical radial distributionof voltage
stress within the dielectric, thereby minimizing the not be acquainted with thehazards involved.
possibility of surface dischargesby precluding exG4.1 GROUNDING OF THE INSULAlION SHIELD
cessive tangentialand longitudinal stresses.
G4.1.1 The insulation shield must
be grounded at least at
3. To protectcableconnected to overheadlinesor
one end and preferably at two or more locations. It is
otherwise subjectto induced potentials.
recommended that the shieldbe grounded at cable termi4. To limit radio interference.
nations and at splices and taps. Stress cones should be
5. To reduce the hazard of shock. This advantage is
made at all shield terminations.
obtained only if the shield is grounded. If not
G4.1.2 The shield should operateat or near groundPOgrounded, thehazard of shock may be increased.
tential atall times.Frequent groundingof shields reduces
G3.1 USE OF INSULATION SHIELDING
the possibility of open sections on nonmetallic covered
G3.1.1 The use of shielding involves consideration of
cable. Multiple grounding of shieldsis desirable in order
installation and operating conditions. Definite rules cannotto improve the reliability and safety of the circuit. All
be established on a practical basis for all cases, but the
grounding connections should be made to the shield in
following features should be considered
as a working basis
such a way as to provide a permanent low-resistance bond.
for theuse of shielding.
Shielding which does not have adequate ground connection
due to discontinuity of the shield or to improper
G3.1.2 Where thereis no metallic covering
or shield over
termination
may be moredangerousthannonshielded
the insulation, the electric field will be partly
in the insunonmetallic
cable and hazardous
to life.
lation and partly in whatever lies between the insulation
and ground. The external field,
if sufficiently intense
in air,
G5.1 SHIELD MATERIALS
will generate surfax discharge and convert atmospheric
G5.1.1 ' h o distinct typesof materials are employed in
be destructive to insulations
oxygen into ozone which may
constructing cable shields.
and to protective jackets. If the surface of the cabIe is
separated from ground aby
thin layerof air and theair gap
G5.1.1.1 Nonmetallic shieldsmay consist of a conductis subjectedto voltage stress which exceeds the dielectric
ing tape or a layer of conducting compound. The
tape may
strength of air, a dischargewilloccur,causingozone
be conducting compound, fibrous
tape faced or filled with
formation.
conducting compound,or conducting fibrous tape.
G3.1.3 The ground may be either a metallic conduit, a
G5.1.1.2 Metallic shields should be nonmagneticand
damp nonmetallic conduit or metallic binding tape or rings
may consist of tape, braid, concentric serving of wires,
OT
on an aerial cable, a loose metallic sheath, etc. Likewise, a sheath.
damage to nonshielded cablemay result when the surface
of the cable is moist, or covered withsoot,soapy grase or
other conductingfilm and the external fieldis partly con-
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
NEMA WC*5 7 2
6470247 0 5 0 2 8 3 4 5 5 7
ICEA s-61-402
G6.1 SPLICES AND TERMINATIONS
G6.1.1 To prevent excessive leakage currentand
flashover, metallic and nonmetallic insulation shields, inclu&ngany conduchg midue ontheinsulationsurface,
must be removedcompletelyatsplicesandtermination.solvent.
COPYRIGHT National Electrical Manufacturers Association
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NEMA WC 5-1992
Page 73
G6.1.2 An outer extruded insulation shield shall be reOr imparting
to
movable without
the underlying insulation.l'lis may be accomplished by
the aid of h a t (
a
i
r flame)orby the use of a sUk&
NEMA WC 5-1992
ICEA S-61-402
Page 74
Appendix H
RECOMMENDED BENDING RADIIFOR CABLES
H3.1.3 Shielded Cables Without Armor
H1.l SCOPE
This appendix containsthe minimum values for the
radii
to whichinsulatedcablesmaybebentforpermanent
training during installation.These limits do not apply to
conduit bends, sheaves, or other curved surfaces around
which the cable maybe pulled under tension while being
installed. Considqtion of side wall pressure may require
selection of larger radii bends. In all cases the minimum
radii specified refersto the innersurface of the cable and
not to the axis of the cable.
H3.1.3.1 TAPE SHIELDED CABLES
The minimum bending radius for tap shielded cables
given below appliesto helically appliedflat or corrugated
tape or longitudinally applied corrugated tape shielded
cables.
The minimum bending radius for a single conductor
cable is twelve times the overall diameter.
For multiple-conductor or multiplexed single conductor
cables having individuallytaped shielded conductors, the
minimum bending radius is twelve times the overall diameter of the individual conductors or seven times the
is greater.
overall diameter, whichever
For multiple-conductor cables having an overall tape
shield over the assembly, the minimum
bending radius is
twelve times the overall diameter of the cable.
H2.1 POWER CABLESWITHOUTMETALLIC
SHEATH, SHIELDING,OR ARMOR
The minimum bending radii for both single- and multiple-conductorcablewithoutmetallicsheath,metallic
shielding, or armor are shown in TableH- 1.
H3.1 POWER CABLES WITH METALLIC
SHIELDING, SHEATHS,OR ARMOR
H3.1.1 Interlocked Armored Cables and Metallic
H3.1.3.2 WIRE SHIELDED CABLES
The minimum bending radius for a single conductor
cable is eighttimes the overall diameter.
For multiple-conductor or multiplexed single conductor
cableshavingwireshieldedindividualconductors,the
minimum bending radiusis eight times the diameter of the
individual conductors or fivetimes the overall diameter,
whichever is greater.
For multiple-conductor cables having
a wire shield over
the assembly, the minimum bending radius is eight
times
the overall diameter
of the cable.
H4.1 DRUM DIAMETERS OF REELS
SeeNEMAhb. No. WC26-1984,Wre undCable Puckaging, which is quoted in TableH-3.
Sheathed Cables
The minimum bending radius for interlocked armored
cablessmooth or corrugated aluminum sheath orlead
sheath shallbe in accordance with Table H-2.
H3.1.2 Flat Tape and WireArmored Cables
The minimum bending radius for all flat tape armored
and all wire armored cables is twelve times the overall
diameter of cable.
Table H-1
MINIMUM BENDING RADIIFOR POWER CABLES SINGLE AND MULTIPLE
CONDUCTOR CABLESWITHOUT METALLIC SHEATH, METALLIC SHIELDING
OR ARMOR
Thickness dConductor Insulation
fnChes
Overall Diameter of Cable
inches
mm
inches
mm
inches
mm
1.000 andless
25.4 and less
1.001 to 2.000
25.4 to 50.8
2.001 and more
50.8 and more
mm
Minimum Bendine:
Radius
~
0.169less
and
4.31less
and
4.32-7.87
0.170-0.310
overand7.88
0.311 and less
4
5
...
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
~~~
~
as a Multiple of Cable Diameter
~~~
5
6
7
7
8
NEMA WC*5 92
b470247 0502836 32T
NEMA WC 5-1992
Page 75
ICEA S-61-402
Table H-2
MINIMUM RADII FOR POWER CABLE
SINGLE & MULTIPLE CONDUCTOR CABLES WlTH INTERLOCKED ARMOR,SMOOTH OR
CORRUGATED ALUMINUM SHEATHOR LEAD SHEATH
Overall Diameter of Cable
inches
mm
0.75
& less
190
& less 381
inches
mm
inches
0.76 to
1.50
191to
1.51&
mm
382 &
larger
larger
Minimum Bending Radius as a Multiple of Cable Diameter
Smooth Aluminum Sheath
Single Conductor
Nonshielded,
Multiple Conductor
or Multiplexed,
with Individually
Shielded Conductors
10
12
15
Single Conductor
Shielded
12
12
15
Multiple Conductor
or Multiplexed,
with Overall Shield
12
12
15
7
7
7
nductors
Multiple Conductor
with Individually
Shielded
12p*
12/1*
lm*
erall
Multiple Conductor
with
12
12
Interlocked Armor or
Corrugated Aluminum
Sheath
Nonshielded
12
Lead12
Sheath
12
*12 x individual shielded urnductor diameter,
or 7 x overall able diameter, whichever is the greater.
COPYRIGHT National Electrical Manufacturers Association
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NEMA
Page 76
ICEA S-61-402
5-1992
Table H-3
EXCERPT FROM NEMA STANDARDS PUBLICATION WC 26-1984,WlREAND CABLE PACKAGING,PUBLICATION NO. WC 26-1984*
-
with
of Cable
A. Single- and multiple-conductor nonmetallic-covered cable
1. Nonshielded and wire shielded, including cables with concentric wires
a. (3-2000
b.Morethan2000Volts
Nonjacketed
1.
2. All others
2. Tape
B. Single- and multiple-conductor metallic-covered cable
1. Tubularmetallicsheathed
a.
Lead
Aluminum
b.
ter-1.750''
Outside
1.
less
er
and diameter-1.751''
2. Outside
2. Wirearmored
16
3. Flat
4.
5. Interlocked armor
C. Multiple single conductors cabled together without common covering, including
self-supporting cables-The circumscribing overall diameter shall
be multiplied by
of 0.75.
the factor givenin item A or B and then bythe reduction factor
Minimum Drum Diameter
as a Multiple of Outside
Diameter* of Cable
P
10
12
14
25
30
14
D. Combinations-For combinations of the types described in items A, B, and C, the
highest factorfor any componenttype shall be used.
E. Single- and multiple-conductor cable in coilable nonmetallic duct
diameter Outside 26
0.0-0.5026
of duct, inches0.51-1.0024
1.01-1.2522
1.26-1.5021
1.502
than
More
1
24
22
21
20
'Outside Diameter1. when metallic-sheathed cables are,covered only b a +ennosetting or thermoplastic jacket, the "outsjde diametet' is $e digeter over the metallic
sheath Itself.In all other cases, the outslde diameterIS &e dlameter outsldeof all the matenal on the cable In the state III whlch It 1s to be wound upon the
reel.
2. For "flat-twin" cables (wherethecable is laced upon the reel with its flat side against thedrum), the minor outside diameter shall
be multiplied by the
appropriate factorto determine the mlnimum$rum diameter.
3. The multiplying factors given for itemE refer to the outside diameter ofthe duct.
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
NEMA WC 5-1992
Page 77
ICEA S-61402
Appendix L
ADDITIONAL CONDUCTOR INFORMATION
Table L-1
SOLID ALUMINUM AND COPPER CONDUCTORS
ConductorSlze,
AWG or kcmn
Approximate Weight
Aluminum
dm
Pwnds per 1000 Feet
...
...
...
22
20
19
18
17
...
...
...
...
...
...
...
...
...
Copper
2.88
4.61
Pounds per 1000 Feet
a..
5.8
7.32
9.24
...
...
...
...
...
dm
1.94
3.10
3.90
4.92
6.21
1
11.6
14.7
18.5
23.4
29.4
16
15
14
13
12
6.01
8.94
7.81
9.87
12.4
15.7
19.8
11
10
9
8
7
7.57
9.56
12.04
15.20
19.16
11.3
14.22
17.92
22.62
28.52
24.9
31.43
39.62
49.98
63.03
37.1
46.77
58.95
74.38
93.80
6
5
4
3
2
24.15
30.45
38.41
48.43
6 1.O7
35.94
45.32
57.17
72.08
90.89
79.44
100.2
126.3
159.3
200.9
118.2
149.0
188.0
237.1
298.9
1
77.03
97.15
122.5
154.4
194.7
114.6
144.6
182.3
229.8
289.8
253.3
319.5
402.8
507.8
640.5
377.0
475.5
599.5
755.8
953.2
230.1
276.1
322.1
368.2
342.4
4 10.9
479.4
547.9
1P
U0
3P
410
250
300
350
400
616.3 450
648.8 500
414.4
460.2
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
0 . .
...
...
...
...
...
...
...
...
e..
...
...
19
NEMA WC 5-1992
Page 78
ICEA S-61402
Table L-2
CONCENTRIC STRANDED CLASSB ALUMINUM AND COPPER CONDUCTORS
Conductor Number Approximate
Approximate
Diameter
size,
of
of Each Strand
Outside Diameter
AWG or Strands
kcmil
mils
mm
inches
mm
22
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
125.5
7
i
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
19
1
19
IP
19
2D
19
3P
19
4D
37
250
37
300
37
350
37
400
37
450
37
500
61
550
61
600
61
650
61
700
61
750
61
800
61
900
61
1000
91
1100
91
lux)
91
1250
1300
91
1400
91
1500
91
127
1600
127
1700
127
1750
127
1800
122.3 127
127
2000
9.6
121
13.6
15.2
17.2
19.2
21.6
24.2
27.2
30.5
34.3
38.5
43.2
48.6
54.5
61.2
68.8
77.2
86.7
97.4
66.4
74.5
83.7
94.0
105.5
82.2
90.0
97.3
101.0
110.3
116.2
95.0
99.2
103.2
107.1
110.9
114.5
121.5
128.0
109.9
114.8
117.2
119.5
124.0
128.4
1122
11 5.7
117.4
19.1
...
0.244
0.307
14
0.345
0.386
0.437
0.488
0.549
0.615
0.691
0.n5
0.811
0.978
1.10
1.23
1.39
1.56
1.75
1.96
2.20
2.47
1.69
1.89
2.13
2.39
2.68
2.09
2.29
2.47
2.64
2.80
2.95
2.41
2.52
2.62
2.72
2.82
2.91
3.09
3.25
2.79
2.92
2.98
3.04
3.15
3.26
2.85
2.94
2.98
3.02
3.11
""
0.029
0.036
0.041
0.046
0.052
0.058
0.737
0.9
1 .04
1.17
1.32
1.47
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
e..
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
Approximate Weight
Copper
AlUminUm
Poundsper 1000 Feet
...
...
...
...
...
...
...
...
6ï3
7.72
9.75
12.3
15.5
19.5
24.6
31.1
39.2
49.4
62.3
78.6
99.1
125
157
199
235
282
329
376
422
469
517
563
610
657
704
751
845
939
1032
1126
1173
1220
1313
1408
1501
15%
1643
1691
1783
i8 n
dm
Pounds per 1000 Feet
...
2.94
...4.705
...
...
...
...
...
...
9ï2
11.5
14.5
18.3
23.1
29.1
36.7
46.2
58.3
73.5
92.7
117
147
186
234
2%
349
419
489
559
629
699
768
838
908
978
1050
1120
1260
1400
1540
1680
1750
1820
1960
2100
2240
2370
2440
2510
2650
2790
1.975
3.154
1
3.974
5.922
7.462
9.429
11.86
14.98
18.88
23.82
30.00
37.80
47.71
60.14
75.9
95.7
121
152
192
242
305
385
485
611
771
972
1150
1380
1610
1840
2070
2300
2530
2760
2990
3220
3450
3680
4140
4590
5050
5510
5740
5970
6430
6890
7350
7810
8040
5.015
6.324
7.974
9.959
12.68
16.01
20.16
25.49
32.06
40.42
51.0
64.2
80.9
102
129
162
205
259
326
411
518
653
772
925
1080
1236
1390
1542
9190
g/m
1700
1850
2006
2160
2316
2469
2780
3086
3394
3703
3859
4012
4320
4632
4936
5249
5403
5562
5865
6176
8n0
8730
NEMA WC85 72 W 6470247 0502820 8 5 0 W
NEMA WC 5-1992
Page 79
ICEA S-61-402
Table L-3
CONCENTRIC STRANDED CLASSC AND D ALUMINUM AND COPPER CONDUCTORS
AwG
or kanu
class D
class C
Conductor
Number &Strands
Approximate Diameter of Each StrandNumber
of Strands
Approximate DIameter of Each Strand
mm
mm
22
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
1P
2P
3P
410
250
300
350
400
450
500
550
600
650
700
750
800
900
loo0
1100
1200
1250
1300
1400
1500
1600
1700
1750
1800
1900
...
...
...
...
...
...
...
...
...
...
...
...
a..
...
...
...
...
S..
...
...
S..
S..
19
19
19
19
19
19
19
19
19
19
19
19
19
37
37
37
37
37
61
61
61
61
61
61
91
91
91
91
91
91
91
91
127
127
127
127
127
127
169
169
169
169
169
- ~
169
...
...
...
...
0.3i3
0.4 19
0.470
0.528
0.594
0.665
0.749
0.841
0.945
1 .06
1.19
1.34
1 so
1.21
1.36
1.52
1.71
1.92
1.63
1.78
1.92
2.06
2.18
2.30
1.97
2.06
2. 15
2.23
2.31
2.38
2.53
2.66
2.36
2.47
2.52
2.57
2.67
2.76
2.47
2.55
2.59
2.62
ìx7
16.5
18.5
20.8
23.4
26.2
29.5
33.1
37.2
41.7
46.9
52.6
59.1
47.6
53.4
60.0
67.3
75.6
64.0
70.1
75.7
81.0
85.9
90.5
77.7
81.2
84.5
87.7
90.8
93.8
99.4
104.8
93.1
97.2
99.2
101.2
105.0
108.7
97.3
100.3
101.8
103.2
_
1
06.0~
~
.
"
2.69
""
37
37
37
37
37
37
37
37
37
37
37
37
37
61
61
61
61
61
91
91
91
91
91
91
127
ln
ln
127
127
127
127
127
169
169
169
169
169
169
217
217
217
217
".
217
...
...
...
...
...
...
...
10.5
11.8
13.3
14.9
16.7
18.8
21.1
23.7
26.6
29.9
33.6
37.7
42.4
37.0
41.6
46.7
52.4
58.9
52.4
57.4
62.0
66.3
70.3
74.1
65.8
68.7
71.5
74.2
76.8
79.4
84.2
88.7
80.7
84.3
86.0
87.7
91.o
94.2
85.9
88.5
89.8
91.1
93.6
%.O
NOTE-The weights of Class C and Class D conductors are the same as for the equivalent ClassB conductor (see Table L-2).
2000
"
"
217 108.8
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
2.76
...
...
...
...
...
...
0.%7
0.300
0.338
0.378
0.424
0.478
0.536
0.602
0.676
0.759
0.853
0.958
1.08
0.940
1.o6
1.19
1.33
1.50
1.33
1.46
1.57
1.68
1.79
1.88
1.67
1.74
1.82
1.88
1.95
2.02
214
225
205
2.14
2.18
223
2 31
2.39
218
225
228
231
"..
2.38
244
ICEA S-61-402
NEMA WC 5-1992
Page 80
Table L 4
ROPE-LAY ALUMINUM AND COPPER CONDUCTORS, CLASSG
Conductor Number Suggested
Approximate
Diameter
She, AWG
of
Construction
Diameter
StrandEach
or kcmil Strands
mils
of
Approximate Weight
Approximate Outside
Copper
Aluminum
mm
inches
mm
Poundsper
g/m
Poundsper
1000 ft.
dm
...
...
20.3
32.3
40.8
51
30.3
48.2
60.7
76.7
29.4
37.0
46.7
58.9
74.2
65
82
103
130
164
96.6
122
154
194
244
93.6
119
150
190
239
207
264
334
419
529
308
392
495
623
786
1000 ft.
...
...
...
...
...
...
...
0.131
O. 148
0.166
2.11
2.64
3.33
3.76
4.22
29.2
32.8
0.59
0.66
0.74
0.83
O. 185
0.208
0.234
0.263
0.295
4.70
5.28
5.94
6.68
7.49
7x7
19x7
19x7
19x7
19x7
36.8
25.1
28.2
31.6
35.5
0.93
0.64
0.72
O. 80
0.90
0.331
0.377
0.423
0.474
0.533
8.41
9.58
10.7
120
13.5
80
102
127
161
133
259
259
259
259
19x7
37x7
37x7
37x7
37x7
39.9
31.1
34.0
36.8
39.3
1.01
0.79
O. 86
0.93
1O
.O
0.599
0.653
0.714
0.773
0.825
15.2
16.6
18.1
19.6
21.0
242
287
337
385
301
358
429
50 1
573
668
795
945
1110
1265
991
1175
1410
1650
1885
450
500
550
600
650
259
259
427
427
427
37x7
37x7
61x7
61x7
61x7
41.7
43.9
35.9
37.5
39.0
1.06
1.12
0.91
0.95
223
23.4
24.6
25.7
26.7
433
482
532
581
629
644
716
79 1
863
935
1425
1585
1750
1910
2120
2355
0.99
0.876
0.922
0.969
1.013
1.O53
700
750
800
900
loo0
427
427
427
427
427
61x7
61x7
61x7
61x7
61x7
40.5
41.9
43.3
45.9
48.4
1.03
1.06
1.10
1.17
1.23
1.G94
1.131
1.169
1.239
1.307
27.8
28.7
29.7
31.5
33.2
678
725
774
869
967
1100
1200
1250
1300
1400
427
427
427
427
427
50.8
53.0
54.1
55.2
57.3
1.29
1.35
1.37
1.40
1.46
1.372
1.431
1.461
1.490
1.547
34.8
36.3
37.1
37.8
39.3
1500
1600
1700
1750
1800
427
703
703
703
703
59.3
47.7
49.2
49.9
50.6
1.51
1.21
1.25
1.27
1.29
1.601
1.670
1.722
1.747
1.771
1900
2ooo
703
703
61x7
61x7
61x7
61x7
61x7
61x7
37x19
37x19
37x19
37x19
37x19
37x19
52.0
53.3
1.32
1.35
1 .820
1.866
14
12
10
9
8
49
49
49
49
49
7x7
7x7
7x7
7x7
7x7
9.2
11.6
14.6
16.4
18.4
0.23
0.29
0.37
0.42
0.47
7
6
5
4
3
49
49
49
49
49
7x7
7x7
7x7
7x7
7x7
20.6
23.1
O. 52
2
1
1lD
3/0
49
133
133
133
133
4/0
250
300
350
400
U0
26.0
0.083
o. 104
20
25
31
40
50
63
203
...
2600
2070
2840
3075
1150
1295
1440
2230
2385
2545
2860
3180
3310
3545
3785
4255
4730
1064
1158
1208
1257
1356
1580
1725
1800
1870
2015
3500
3810
3975
4135
4460
5205
5675
5910
6150
6620
40.7
424
43.7
44.4
45.0
1452
1560
1660
1709
1756
2155
2325
2470
2540
2615
4775
5130
5620
5775
7095
7640
8115
8355
8595
46.2
47.4
1854
1950
2760
2905
6100
64 15
9550
1005
1080
5460
9070
N-Rope-lay aluminum
Class G conductors are not recommendedin sizes 8AWG and smaller andindividual aluminumwires in stranded conductors should not be. smaller than 24 AWG.
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
NEMA WCE5 92
m 6470247
0502822 6 2 3
m
ICEA S-61402
NEMA WC 5-1992
Page 81
Table L-5
ROPE-LAY ALUMINUM AND COPPER CONDUCTORS, CLASS
G
Conductor Number Suggested
Approximate Diameter
S&AWC
of
Construction
of Each Strand
or kcmil Strands
mils
mm
8
7
6
5
4
133
133
133
133
133
3
2
2
133
133
259
259
259
1
110
au
3m
310
410
410
250
300
350
400
450
500
550
600
650
700
259
259
421
259
421
427
421
421
427
421
421
703
703
703
703
loo0
1100
703
703
703
703
703
1200
1250
1300
1400
1500
703
703
703
703
703
1600
1700
1750
1800
1159
1159
1159
1159
1900
1159
1159
750
800
900
ux)o
19x7
19x7
19x7
19x7
19x7
19x7
19x7
37x7
37x7
37x7
37x7
37x7
61x7
37x7
61x7
61x7
61x7
61x7
61x7
61x7
61x7
37x19
37x19
37x19
37x19
37x19
37x19
37x19
37x19
37x19
37x19
37x19
37x19
37x19
37x19
61x19
61x19
61x19
61x19
61x19
~.
~.
61x19
Approximate Outside
Diameter
Approximate Weight
Aluminum
Copper
Poundsper
1000 n.
g/m
52
65
82
105
132
77.4
97.5
123
155
196
167
208
210
266
334
247
311
312
394
497
...
626
790
794
996
1000
inches
mm
Pouodsper
1000 n
g/m
...
...
...
...
...
...
...
...
...
63
...
...
...
54.5
102
151
11.1
12.5
14.0
15.8
17.7
0.28
0.32
0.36
0.40
0.45
O.1 67
0.188
0.210
0.237
0.266
4.24
4.78
5.33
6.02
6.76
19.9
22.3
16.0
18.0
20.2
0.51
0.57
0.41
0.46
0.51
0.299
0.335
0.336
0.378
0.424
7.59
8.51
8.53
9.60
10.8
22.7
25.5
19.8
28.6
22.3
0.58
0.65
0.50
0.73
0.57
0.477
0.536
0.535
0.601
0.602
12.1
13.6
13.6
15.3
15.3
128
162
190
240
204
205
303
304
422
533
532
670
675
24.2
26.5
28.6
30.6
32.5
0.61
0.67
0.73
0.78
0.83
0.653
0.7 16
0.772
0.826
0.878
16.6
18.2
19.6
21.0
223
242
290
337
386
436
360
431
M3
575
647
795
953
1110
1270
1435
1180
1420
1655
1890
2130
34.2
28.0
29.2
30.4
31.6
0.87
0.71
0.74
0.77
0.80
0.923
0.980
1.o22
1.064
1.106
23.4
24.9
26.0
27.0
28.1
483
538
584
634
686
719
798
871
944
1015
1590
1770
1920
2085
2255
2365
2625
2865
3105
3340
32.7
33.7
35.8
37.7
39.6
0.83
0.86
0.91
0.96
1 .o1
1.145
1.180
1.253
1.320
1.386
29.1
30.0
31.8
33.5
35.2
733
778
880
974
1075
1090
1160
1305
1450
1595
24 10
2560
2895
3205
3535
3580
3820
4295
4175
5250
41.3
42.2
43.0
44.6
46.2
1 .o5
1 -07
1 .o9
1.13
1.17
1.446
1.471
1.505
1.561
1.617
36.7
37.5
38.2
39.6
41.1
1169
1221
1268
1363
1464
1740
1815
1885
2035
2180
3845
4015
4170
4485
4815
5730
5970
6205
6685
7160
37.2
38.3
38.9
39.4
0.94
0.97
0.99
1 .o0
1.674
1.724
1.751
1.773
425
43.8
44.5
45.0
1564
1658
1710
1754
2325
2470
2540
2615
5145
5455
5625
5770
7640
8115
8355
8595
40.5
41.5
1 .O3
1 .o5
1.823
1.868
46.3
47.4
1854
1946
2760
2905
6100
6400
9070
NOTE”Individua1 aluminum wires in stranded conductors should M t be smaller than 24 AWG.
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
...
...
...
...
9550
NEMA WC 5-1992
Page 82
ICEA S-61402
Table L-6
ALUMINUM AND COPPER CONDUCTORS, CLASS I
EACH INDIVIDUAL STRAND24 AWG 0.0201 INCH (0.511 MM)
..
OuGde Diameter
Conductor
Approximate
Suggested
Number of
Size,AWGor
kcmil
Construction
Strands
Aluminum
Pounds per
inches
mm
Copper
1000 n
dm
...
...
...
Poundsper
1000 n
dm
48.3
10
9
8
7
6
1x26
1x33
1x41
1x52
7x9
26
33
41
52
63
0.125
0.138
O. 156
0.185
0.207
3.18
3.51
3.%
4.70
5.26
16
20
24
23.1
29.3
36.3
32.5
41
51
65
80
5
4
3
2
1
7x12
7x15
7x19
7x23
7x30
84
105
,133
161
210
0.235
0.263
0.29 1
0.3 19
0.367
5.97
6.68
7.39
8.10
9.32
32
41
51
62
81
48.9
60.4
76.5
92.7
121
105
134
169
205
267
159
199
252
305
397
1P
2P
3P
4P
250
19x14
19x18
19x22
19x28
7x7~13
266
342
418
532
637
0.44 1
0.500
0.549
0.613
0.682
11.2
12.7
13.9
15.6
17.3
104
133
163
208
25 1
155
199
243
309
374
342
439
537
683
825
508
654
799
1015
1230
300
350
400
450
500
7x7~15
7x7~18
7X7m
7X7x23
7X7X25
735
882
980
1127
1225
0.737
0.800
0.83 1
0.894
0.94 1
18.7
20.3
21.1
22.7
23.9
290
348
386
43 1
517
575
444
661
483
719
955
1145
1270
1460
1590
1420
1700
1890
2175
2365
550
650
700
750
7X7x28
7X7X30
19~7x12
19~7x13
19~7x14
1372
1470
1596
1729
1862
0.980
1.O27
1.152
1.194
1.235
24.9
26.1
29.3
30.3
31.4
541
579
635
687
740
805
862
945
1025
1100
1780
1905
2090
2260
2435
2835
3110
3365
3625
800
900
1000
1100
1200
19~7x15
19~7x17
19~7x19
19~7x21
19~7x22
1995
2261
2527
2793
2926
1.290
1.372
1.427
1.495
1.537
32.8
34.8
36.2
38.0
39.0
793
901
1005
1111
1164
1180
1340
1495
1655
1730
2610
2965
3305
3655
3830
3885
4405
4920
5440
5700
1250
1300
1400
1500
1600
19X7x23
19x7~24
19~7x26
19~7x28
19~7x30
3059
3192
3458
3724
3990
1.564
1.605
1.674
1.715
1.797
39.7
40.8
42.5
43.6
45.6
1216
1269
1386
1482
1587
1810
1890
2045
2205
2360
4000
4175
4560
4875
5220
5955
6215
6735
7250
7770
1700
1750
1800
1900
2000
19~7x32
19X7X33
19x7~34
19~7x36
19~7x37
4256
4389
4522
4788
4921
1.852
1.880
1.921
1.976
2.003
47.0
47.8
48.8
50.2
50.9
1693
1746
1800
1905
1958
2520
2600
2675
2835
2915
5570
5745
5920
6265
8290
8545
8805
9325
9585
600
a..
NOTE-Aluminum Class I conducton are not reunnmended in sizes 8 AWG and smaller.
COPYRIGHT National Electrical Manufacturers Association
Licensed by Information Handling Services
6440
61.3
76.1
96.5
119
2645
NEMA WC*5 72
= b470247
0502824 4Tb M
NEMA WC 5-1992
Page 83
ICEA S-61402
.- ."
Table L-7
COPPER CONDUCTORS, C G S S K EACH INDIVIDUAL STRAND30 AWG, 0.0100 INCH (0.254 MM)
ConductorStZe,
AWC or kcmil
wzConstruction
Approximate
Approximate Outside Diameter
ApproxtmnteWeight
Number of Strands
Inches
mm
Poundsper 1000 ft.
g/m
0.9720
18
16
14
12
0.038
lx10
1x16
1x26
1x41
1x65
10
16
26
41
65
0.048
0.060
0.078
0.101
1.22
1.52
1.98
2.57
5.0
8.0
12.8
20.3
7.35
11.9
18.8
29.9
10
9
8
7
6
1x104
7x19
7x24
7x30
7x38
104
133
168
210
266
0.126
0.150
0.157
0.179
0.210
3.20
3.81
3.99
4.55
5.33
32.5
42
53
66
84
47.8
62.3
78.7
98.4
125
5
4
3
2
1
7x48
7x60
19x28
19x35
19x44
336
420
532
665
836
0.235
0.272
0.304
0.338
0.397
5.97
6.9 1
7.72
8.59
10.1
106
132
169
211
266
157
197
252
3 15
395
1P
2P
3P
4P
250
19x56
7X7x27
7x7m
7X7x43
7 x 7 61
1064
1323
1666
2107
2499
0.451
0.470
0.533
0.627
0.682
11.5
11.9
13.5
15.9
17.3
338
425
535
676.
802
503
632
795
1005
1195
300
350
400
450
500
7x7~61
19~7x26
19X7x30
1Mx34
19x7~38
2989
3458
3990
4522
5054
0.768
0.809
0.878
0.933
0.988
19.5
20.5
22.3
23.7
25.1
960
1120
1290
1465
1635
1425
1665
1925
2180
2435
550
5453
5985
65 17
69 16
7581
1.O56
1.125
1.166
1.207
1.276
26.8
28.6
29.6
30.7
32.4
1765
1940
2110
2240
2455
2630
650
700
750
19x7~41
19x7~45
19x7~49
19X7X52
19x7~57
800
900
loo0
19x7~60
37X7X35
37X7X39
7980
9065
10101
1.305
1.323
1.419
33.1
33.6
36.0
2585
2935
3270
3845
4370
4870
600
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2885
3140
3335
3655
NEMA WC 5-1992
Page 84
ICEA S-61-402
Table L43
COPPER CONDUCTORS,CLASS M EACH INDNIDUAL STRAND34 AWG, 0.0063 INCH (0.160 MM)
sua-
Conductor Size,
AWC or kcmil
20
18
16
14
12
Construction
3.2
1x26
1x41
1x65
1x104
7x241
Approximate
Number of Strands
Approximate Outside Diameter
inches
mm
Pounds per 1000 ft.
dm
5.0
8.0
12.8
21.o
4.74
7.48
11.9
19.0
31.2
0.97 26
41
65
104
168
0.038
0.048
0.078
0.101
1.22
1.52
1.98
2.57
0.060
Approximate Weight
10
9
8
7
6
7x37
7x48
7x60
19x28
19x35
259
336
420
532
665
0.126
0.146
0.162
0.1%
0.215
3.20
3.71
4.11
4.98
5.46
32.5
42
53
67
84
48.2
62.5
78.1
100.0
125
5
4
3
2
19x44
19x56
7X7x27
7X7x34
7X7X43
836
1064
1323
1666
2107
0.240
0.269
0.305
0.337
0.376
6.10
6.83
7.75
8.56
9.55
105
134
169
212
268
157
200
25 1
316
399
7X7x54
1Mx25
19x7~32
19X7x40
19x7~48
2646
3325
4256
5320
6384
0.423
0.508
0.576
0.645
0.7 13
10.7
12.9
14.6
16.4
18.1
337
427
547
684
821
501
636
8 14
1020
1220
300
350
400
450
500
19X77x57
37X7X34
37X7X39
37X7X44
37X7X49
758 1
8806
10101
113%
12691
0.768
0.825
0.901
0.940
0.997
19.5
21.0
22.9
23.9
25.3
975
1130
1300
1465
1630
1450
1685
1930
2180
2430
550
61~7x32
61x7~35
61x7~38
61x7~41
61x7~44
13664
14945
16226
17507
18788
1.O35
1.o84
1.133
1.183
1.207
26.3
27.5
28.8
30.0
30.7
1755
1920
2085
2250
24 15
2615
2860
3 105
3350
3595
61x7~47
61~7x53
61x769
20069
2263 1
25193
1.256
1.33 1
1.404
31.9
33.8
35.7
2580
2910
3240
3840
4330
4820
1
110
V0
310
410
250
600
650
700
750
800
900
loo0
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NEMA STANDARDIZATION BACKGROUND
The purpose of NEMA Standards, their classification, and status are set forth in certainclauses of the hTMA
SfandardizationPolicies and Proceduresmanual andare referenced below:
Purpose of Standards
National Electrical Manufacturers Association Standards
are adopted in the public interest andare designed to eliminate
misunderstandings between the manufacturer and the purchaser and
assist
to the purchaser in selecting and obtaining the
proper productfor their particular needs. Existence of a National Electrical Manufacturers Association Standard does not
in any respect
pmlude any member or nonmember from manufacturing
or selling products not conforming to the standard.
(StandardizationPolicies and Procedures,p . I )
Definition of a Standard
A Standard of the National Electrical Manufacturers Association defines
product,
a pmess or procedure with reference
to one or more of the following: nomenclature, composition, dimensions, tolerances, safety, operating characteristics,
performance, rating, testing, and the service
for which hey are designed.
(StandardizationPolicies and Procedures,p . 2)
Dimensions
Where dimensionsare given for interchangeability purposes,
alternate dimensions satisfyingthe other provisionsof the
Standards Publicationmay be capable of otherwise equivalent performance.
(StandardizationPolicies and Procedures,p . 8)
Categories of Standards
Nation31Elecmcal Manufacturers Association Standards
are of three classes, which have received
the affirmative vote
of at least two-thirds of the Subdivision votes cast in the affirmative
or negative:
1. hE44 Standard, which relates to a product, or
process,
procedure commercially standardized subject
and to repetitive
manufacture.
2. Suggested Standard for Future Design, which
may not have been regularly
applied to a commercial product, but which
suggests a sound engineering approach to future development.
3. Adoptive Standard, which
is adopted in whole or in part from the standards of
another organization, either domestic,
regional, or international.
(StandardizationPolicies and Procedures, pp. 7 & 16)
Authorized Engineering Information
Authorized Engineering Information consistsof explanatory data and other engineering information of
an informative
character not falling within the classification
of NEMA Standard or Suggested Standardfor Future Design, which standard
has received the affirmative vote atofleast two-thirds of the Subdivision votes
cast in the affirmative or negative.
(StandardizationPolicies and Procedures, pp. 7 & 16)
Identification of Status
Standards in NEMA Standards Publications are identified as “NEMA Standard,” “Suggested Standard for Future
Design,” or ‘‘Adoptive Standard.”
These indicate the status ofthe standard. A statement incorporatingthe auxiliary verb
“shall” indicates that compliance with a requirement is mandatory
for compliance with the standard. These classes of
standards are identifed in the forewordor throughout the text.
The material identified
as “Authorized Engineering Information’’
is designated similarly. Statements incorporating other
auxiliary verbs suchas “should,” “may,” etc. refer
to authorized engineering information and
not to procedures required
for compliance withthe standard.
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NEMA WC*5
92
6470247 0502827
L05 M
POWER AND CONTROL CABLE SECTION
OF THE
NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION
Member Companies
Alcan Cable
Atlanta, GA 30346
Alcatel Chester Cable Corp.
Chester, NY 10918
The Kerite Company
Subsidiary of Hubbell, 1%.
Seymour, CT 06483
The Okonite Company
Ramsey, NJ 07446
Amercable
Division of Associated Materials
EI Dorado, AR 71730
Pirelli Cable Corporation
Florham Park, NJ 07932
BICC Cables Corporation
West Nyack,NY 10994
The Rockbestos Company
New Haven, CT 06504
Cablec Continental Cables
Co.
York, PA 17402
Rome Cable Corporation
Rome, NY 13440
Carol Cable Company
Highland Heights,KY 41076
Royal Elecuic/Triangle
Pawtucket, RI 02862
Furcm Company
Dekoron Division
Aurora, OH 44202
Southwire Company
Carrollton, GA 30119
COPYRIGHT National Electrical Manufacturers Association
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Triangle Wire& Cable, Inc.
Lincoln, RI 02865