Diagnostic Test For Electrician License Examination Preparation
Voltage Drop - Single Phase
Time Limit for This Page: 24 minutes
References Permitted: National Electrical Code®, American Electrician's Handbook
Appropriate for Journeyman Electrician, Master Electrician and Electrical Inspector Exams.
Question #1
What is the voltage drop on a 120 volt load located 120 feet away from the source if it is 12 amps when #10 THW copper stranded conductor is used?
Question #2
What is the minimum size THWN copper conductor needed to supply a 240 volt 5000 watt load located 240 feet away from the 240 volt source?
Question #3
What is the maximum current that can be supplied by a #6 TW copper conductor fed from a 120 volt source if the voltage drop is to be 5 volts maximum over the 160 foot run?
Question #4
What is the maximum distance a 2400 watt load can be located from the 240 volt source if it is to be fed with #8 THW copper conductors? Note: Voltage drop can not exceed the NEC® recommended maximum voltage drop.
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.