Electrical Power Cable Engineering, 3rd Edition

14	Ampacity of Cables Carl C. Landinger

CONTENTS

14.1    Introduction

14.2    Soil Thermal Resistivity

14.3    Ampacity Calculations

14.3.1    Heat Transfer Model

14.3.2    Load Factor

14.3.3    Loss Factor

14.3.4    Conductor Losses

14.3.4.1    Direct Current Conductor Resistance

14.3.4.2    Alternating Current Conductor Resistance

14.3.4.3    Proximity Effect

14.3.4.4    Hysteresis and Eddy Current Effects

14.3.5    Calculation of Dielectric Loss

14.3.6    Metallic Shield Losses

14.4    Typical Thermal Circuits

14.4.1    Internal Thermal Circuit for a Shielded Cable with Jacket

14.4.2    Single Layer of Insulation, Continuous Load

14.4.3    Cable Internal Thermal Circuit Covered by Two Dissimilar Materials, Continuous Load

14.4.4    Cable ...