Diagnostic Test For Electrician License Examination Preparation
Voltage Drop - Three Phase
Time Limit for This Page: 24 minutes
References Permitted: National Electrical CodeŽ, American Electrician's Handbook
Appropriate for Journeyman Electrician, Master Electrician and Electrical Inspector Exams.
Question #1
What is the operating voltage of a 42 amp three phase load if it is located 260 feet from the 480 volt source and #2 THW copper conductor is used?
Question #2
What is the voltage drop on a three phase 50 amp load 500 feet from the 240 volt source if #1 THHN-THWN copper is used?
Question #3
What is the minimum THWN copper conductor that can be used if voltage drop must be held to 10 volts where a three phase 100 amp load is located 300 feet from the power transformer?
Question #4
What is the maximum distance a 60 amp three phase load can be located from a 208 volt source if #3 THW copper conductors are used?
Upon completion, use any remaining time to make sure you have the right answers. When time has expired, go to the answer page to check your answers with the given answers.
Click HERE for ANSWERS TO DIAGNOSTIC TESTS.
If you did not score three correct in the time allowed, then you might want to consider exam preparation with the help of the David U. Larson workbook:
Click HERE for INFO ABOUT Calculations Workbooks for Electrician License Examinations.