Professional Course

Practical Power Cable Ampacity Analysis

PDHengineer, Online
3 hours
89.90 USD
Next course start
Start anytime! See details
Self-paced Online
3 hours
89.90 USD
Next course start
Start anytime! See details
Self-paced Online
This provider usually responds within 48 hours 👍

Course description

engineer in tunnel

In Practical Power Cable Ampacity Analysis, you'll learn ...

  • Basic theory and factors that stand behind underground cable ampacity calculations
  • How underground cable installation methods affect cable current carrying capacity
  • Numerical methods that are used for underground cable sizing including voltage drop and short circuit current calculations
  • How to calculate underground cable current carrying ampacity following real world examples


Credit: 3 PDH

Length: 26 pages

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.

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Certificate of Completion

You will be able to immediately print a certificate of completion after passing a multiple-choice quiz consisting of 22 questions. PDH credits are not awarded until the course is completed and quiz is passed.

Training content

This course teaches the following specific knowledge and skills:

  • Heat flow process in underground cables
  • Adjustments factors that affect cable current carrying capacities (ambient, thermal resistivity, grouping etc.)
  • Calculation of permissible short circuit currents (adiabatic and non-adiabatic)
  • Calculation of permissible voltage drop
  • Effects of installation methods
  • Computer solutions
  • Practical examples


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77070 Houston Texas

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