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FALL-OF-POTENTIAL METHOD TESTING PROCEDURE APPENDIX D: GROUNDING (EARTHING) ELECTRODE SYSTEM TESTING/VERIFICATION
Shelter
Site
Boundary
= Grounding Electrode
System
Diagonal
3.05 m
(10 ft.)
6.1 m
(20 ft.)
9.2 m
(30 ft.)
NOTE: Connection point of meter X clip is typically to
external master ground bus.
Test Point (NOTE)
(X connecting
point)
Tower
12.2 m
(40 ft.)
15.2 m
(50 ft.)
Required placement of Z probe
(In this example, the 30 x 30 ft. site
requires 129 m (424 ft.) from the planar
center of the grounding electrode
system under test and the Z probe)
FIGURE D-3 OUTER REFERENCE ELECTRODE (Z-PROBE) PLACEMENT FOR A TYPICAL SITE
D-6 68P81089E50-B 9/1/05
128 m
(420 ft.)
131 m
(430 ft.)
134 m
(440 ft.)
137 m
(450 ft.)