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Practical Power Cable Ampacity Analysis

COURSE NO: E04-028
Practical Power Cable Ampacity Analysis
Course Highlights

This online engineering PDH course provides an introduction to practical power cable ampacity analysis, including cable sizing and underground cable current carrying capacity calculations, and the theory behind them.


Cable ampacity studies calculate the current-carrying capacity (ampacity) of power cables in underground or above ground installations. This ampacity is determined by the maximum allowable conductor temperature. In turn, this temperature is dependent on the losses in the cable, both I2R and dielectric, and thermal coupling between heat-producing components and ambient temperature.


The ampacity calculations are extremely complex. This is due to many considerations, some examples of which are heat transfer through the cable insulation and sheath, and, in the case of underground installations, heat transfer to duct or soil as well as from duct bank to soil. Other considerations include the effects of losses caused by proximity and skin effects. In addition, depending on the installation, the cable-shielding system may introduce additional losses. The analysis involves the application of thermal equivalents of Ohm's and Kirchoff's laws to a thermal circuit.


This online PDH course is applicable to electrical engineers with a desire to understand the fundamentals of Practical Power Cable Ampacity Analysis.

Learning Objectives

This PE continuing education course is intended to provide you with the following specific knowledge and skills:

  • Understanding the basic theory and factors that stand behind underground cable ampacity calculations
  • Understanding how underground cable installation methods affect cable current carrying capacity
  • Learning about the numerical methods that are used for underground cable sizing including voltage drop and short circuit current calculations
  • Learning how to calculate underground cable current carrying ampacity following real world examples
Course Document
In this professional engineering CEU course, you need to review the course document titled, "Practical Power Cable Ampacity Analysis".
To view, print and study the course document, please click on the following link(s):
Practical Power Cable Ampacity Analysis (1.4 MB)
Course Quiz
Once you complete your course review, you need to take a multiple-choice quiz consisting of twenty five (25) questions to earn 4 PDH credits. The quiz will be based on this entire document.
The minimum passing score is 70%. There is no time limit on the quiz, and you can take it multiple times until you pass at no additional cost.
Certificate of Completion

Upon successful completion of the quiz, print your Certificate of Completion instantly. (Note: if you are paying by check or money order, you will be able to print it after we receive your payment.) For your convenience, we will also email it to you. Please note that you can log in to your account at any time to access and print your Certificate of Completion.

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