Diagnostic Test For Electrician License Examination Preparation
Junction Box Sizing
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 minimum depth for a 4 inch square box if it is used as a pull box for ten #10 THW conductors that are looped?
Question #2
What is the minimum depth for a 4 11/16 square box if it is used for a junction box of 10 #10 THW conductors which enter the box and are spliced to 10 #10 THW conductors which exit the box?
Question #3
What is the minimum square gutter dimension in even numbered inches that would hold twenty #4 THWN copper conductors?
Question #4
What is the minimum even numbered inch depth of a 12 inch by 12 inch junction box if it is used to splice sixteen #6 THW's which enter the box with sixteen #6 THW's that exit?
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.
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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.