Question 5031 of 844 · Washington 01 Journey Level Electrician Exam
What is the minimum size copper main bonding jumper for a service with 4/0 AWG copper ungrounded conductors?
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Correct answer to question 5031
- C: 2 AWG
Explanation
The main bonding jumper is sized from Table 250.102(C)(1) based on the largest ungrounded service conductor. For copper over 3/0 through 350 kcmil the jumper must be at least 2 AWG copper. See 250.28(D).
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