NEMA WC 50-1976/ICEA P-53-426 Second Edition (R1993, R1999)
Withdrawn
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07-23-2013
01-12-2013
A. Index of Page Numbers for Ampacity Tables
B. Introduction
C. Scope
D. Effect of Shield Currents on Cable Ampacity
E. Technical Features of Tables
E.1 Parameters
E.2 Use of Ampacity Tables
E.3 Earth Interface Temperature
E.4 Adjustments for Changes in Parameters
F. Method of Calculation
F.1 Conductor Loss
F.2 Shield Loss
F.3 Thermal Resistance of Cable Surface to Duct
F.4 General Equations for Ampacity
F.5 Calculation of Ampacity Based on Maximum Earth
Interface Temperature
G. References
Tables
A. Conductor and Shield Resistances
B. Ampacity Derating Factors for Shield Eddy Current
Loss of Trefoil Single-conductor Cables
Figures
Installation Configurations
1-5 Direct-buried Cables
6-10 Cables in Duct
11 Flow Chart - Computation of Ampacity Based on Maximum
Conductor and Earth Interface Temperatures
Ratio of Shield Loss to conductor D-c Loss
12. Triplexed Cables
13. Spaced Cables
Tables of Ampacities
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