Electrical Exam Prep Tip #101

Exam Prep Question for the Electrical Exam

Exam Preparation Book Mike HoltThis question is from Mike Holt's  2014 Electrical Exam Preparation,

By Mike Holt for EC&M Magazine

Try your best to answer these questions without looking at the answers.
Q. What are the rules in sizing a supply side bonding jumper sized for parallel raceways?
A. If the ungrounded supply conductors are paralleled in two or more raceways or cables, the size of the supply-side bonding jumper for each raceway or cable is sized in accordance with Table 250.102(C)(1), based on the size of the largest ungrounded conductors in each raceway or cable [250.102(C)(2)].
Question: What size single supply-side bonding jumper is required for three metal raceways, each containing 400 kcmil service conductors?
(a) 1 AWG     
(b) 1/0 AWG     
(c) 2/0 AWG     
(d) 300 AWG
Table 250.102(C)(1).
Grounded Conductor, Main Bonding Jumper, System Bonding Jumper, and Supply-Side Bonding Jumper Alternating-Current Systems
Size of Largest Ungrounded Conductor Per Raceway
Size of Conductor or Bonding Jumper
Aluminum or Copper-Clad Aluminum
2 or smaller
1/0 or smaller
1 or 1/0
2/0 or 3/0
2/0 or 3/0
Over 3/0 250 kcmil
Over 3/0 through 350 kcmil
Over 250 through 500 kcmil
Over 350 through 600 kcmil
Over 500 through 900 kcmil

Answer: (b) 1/0 AWG [Table 250.102(C)(1)]

The purpose of the NEC Practice Questions book is to create an ideal environment to test your NEC knowledge. The design of this book builds your skills section by section and includes over 2,100 NEC questions. The book includes 10 Quizzes of 100 questions each that are in Code Order and take you through each of the nine chapters of the NEC. There are also 10 additional quizzes where the NEC questions are in random order in order to challenge your NEC knowledge. There are seven Final quizzes on all chapters of the code that are in random order that help you really get familiar with your code book. Going through this book really builds your code knowledge and your ability to find things quickly as you proceed. After building your skills you can test your knowledge with the two Final Exams in the back of the book.

Please note:*This book is extracted from our 2014 Electrical Exam Preparation Book. The content in this book is also found in the NEC Exam prep book.

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