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Foreign Voltages and Frequency Guide

COURSE NO: E03-022
COURSE PROVIDER: Jeffrey Cwalinski, P.E.
Foreign Voltages and Frequency Guide
Course Highlights

This online engineering PDH course introduces the issues associated with designing low voltage and medium voltage electrical systems using components whose voltage and frequency requirements are outside the system's operating voltage and frequency.  This situation occurs when using components designed for the United States of America market in foreign countries.


Initially, transformer theory is reviewed to present a theoretical overview of the effects of operating at out-of-tolerance voltage and frequency. Then, specific equipment that is used in low voltage and medium voltage systems is evaluated with respect to sensitivity to operation at out-of-tolerance voltages and frequencies frequently found in other countries. Finally, recommendations for derating equipment for use at these voltages and frequencies are discussed.


This 3 PDH online course is intended for electrical engineers, design professionals, as well as those who require a basic knowledge to enhance their primary responsibilities.

Learning Objectives

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

  • Understanding the consequences of operating equipment outside of voltage and frequency tolerances
  • Learning about specific low and medium voltage equipment affected by operation outside of voltage and frequency tolerances
  • Considering the parameters when operating a medium voltage iron core device outside of its voltage and frequency tolerances
  • Knowing the derating factors for 50 Hz operation
Course Document
In this professional engineering CEU course, you need to review the publication titled, "Technical Manual TM 5-688, Foreign Voltages and Frequencies Guide", which is contained in the Unified Facilities Criteria, UFC 3-510-01.
To view, print and study the course document, please click on the following link(s):
Foreign Voltages and Frequency Guide (1.6 MB)
Course Quiz
Once you complete your course review, you need to take a multiple-choice quiz consisting of fifteen (15) questions to earn 3 PDH credits. The quiz will be based on this UFC publication.
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.

To buy the course and take the quiz, please click on: