standards and guidelines for communication sites - Radio And ...

STANDARDS AND GUIDELINES FOR COMMUNICATION SITES SITE PREPARATION CONSIDERATIONS
Resistance Ratio (Multiple Rods/One Rod)
Line drawn from
intersection solves
system Ω to be 0.17 of
single-rod Ω
0.01
0.1
1.0
1 5 10 50 100
Number of Rods
Because 16 rods are used, point
corresponding to “16” on Number
of Rods in graph is selected
FIGURE B-14 EXAMPLE CALCULATION OF GROUND ROD GRID CONFIGURATION
300,000
100,000
68P81089E50-B 9/1/05 B-29
20,000
10,000
5,000
2,000
1,000
500
Because grid is 900 sq. ft., a
point just below 1,000 sq. ft.
curve on graph is plotted.