LESSON 1
PRACTICE EXERCISE
The following items will test your grasp of the material covered in this lesson. There is only one correct
answer to each item. When you complete the exercise, check your answer with the answer key that
follows. If you answer any item incorrectly, study again that part of the lesson which contains the
portion involved.
1.
What is the minimum length, in feet, of a grounding rod?
A.
3
B.
5
C.
8
D.
9
2.
What are the best grounding rods made of?
A.
Copper
B.
Steel
C.
Lead
D.
Iron
3.
What is the minimum diameter, in inches, of a copper grounding rod?
A.
1/4
B.
1/2
C.
5/8
D.
3/4
4.
What is the minimum diameter, in inches, of a solid-steel grounding rod?
A.
1/4
B.
1/2
C.
5/8
D.
3/4
5.
What is the minimum diameter, in inches, of a galvanized steel grounding rod?
A.
1/4
B.
1/2
C.
5/8
D.
3/4
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EN5144
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