6.
What is the minimum distance, in feet, that a properly installed grounding rod should be driven?
A.
6
B.
8
C.
10
D.
12
7.
If a grounding rod cannot be driven to the proper depth, what is the maximum angle, in degrees,
that it can be driven into the earth?
A.
25
B.
35
C.
45
D.
55
8.
When rock is encountered and the grounding rod cannot be driven 8 feet, what is the minimum
depth, in feet, that it can be buried?
A.
1 1/2
B.
2 1/2
C.
3 1/2
D.
4 1/2
9.
What is the minimum thickness, in inches, of a steel grounding plate?
A.
1/16
B.
1/8
C.
1/4
D.
1/2
10. What is the minimum thickness, in inches, of a nonferrous grounding plate?
A.
1/16
B.
1/8
C.
1/4
D.
1/2
11. At what intervals, in feet, should the soil be tamped when burying a grounding plate?
A.
1
B.
2
C.
3
D.
4
EN5144
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