LESSON 2
PRACTICE EXERCISE
The following items will test your grasp of the material covered in this lesson. There is only one correct
answer for 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.
Which conductor is best?
A.
Copper
B.
Aluminum
C.
Copper-covered aluminum
D.
Steel
2.
Ground conductors must be made of stranded wires.
A.
True
B.
False
3.
Aluminum ground conductors are better to use in an electrical circuit because they do not loosen in
the damp.
A.
True
B.
False
4.
What size copper ground conductor is needed for a service-entrance cable with a 4/0 copper
conductor (see Table 2-1, page 2-4)?
A.
No. 2
B.
No. 4
C.
No. 6
D.
No. 8
5.
Metallic water pipe must be bonded to the grounding system if it is in direct contact with soil for a
minimum of how many feet?
A.
8
B.
10
C.
12
D.
14
2-11
EN 5144
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