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Journeyman Electrician Exam (NEC-based)

Grounding and bonding: practice questions

Our Journeyman Electrician bank has 19 questions on this topic. Here are 4 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1

Why must a metal underground water pipe electrode be supplemented by another electrode?

  1. Water conducts too well
  2. The pipe could be replaced by plastic, breaking the grounding path
  3. It's never allowed
  4. It's too expensive
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B. The pipe could be replaced by plastic, breaking the grounding path — It must be in contact with earth for 10 feet or more.

Question 2

What is the minimum size copper equipment grounding conductor for a 200-amp feeder?

  1. 6 AWG
  2. 4 AWG
  3. 8 AWG
  4. 2 AWG
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A. 6 AWG — See Table 250.122.

Question 3

What is the purpose of a grounding electrode?

  1. To protect the branch circuits against overloads and short circuits
  2. To reduce voltage drop
  3. To connect the electrical system to the earth
  4. To carry normal load current
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C. To connect the electrical system to the earth — It limits voltage from lightning and line surges.

Question 4

When two ground rods are used, how far apart must they be at minimum?

  1. 20 feet
  2. 10 feet
  3. 2 feet
  4. 6 feet
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D. 6 feet — Wider spacing improves effectiveness.

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