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26
SERIES
A potential problem could exist if a fault should lie beneath a paved surface. In this case, the Ground
Return Probe or
staff
will be used in the dirt at the side of the paved area. Since the return current in
the soil begins its return from the fault - like the spokes of a wheel laying on the ground - equal amounts
of current will enter the GRP if it is placed on the ground and positioned broadside to the fault. At the
point where the directional indication changes the fault will lie on a straight line projected at a right
angle from the center of the GRP.
The GRP adjustments can be made by slightly rotating the
G
round
r
eturn
P
roBe
to find the directional
change. The operator should record this line over the paved area. By repeating this procedure from
another location near the paved area, another line will be produced. The intersection of the two lines
is the location of the fault.
CABLE
PAVED ROAD
GROUND RETURN PROBE IS
POSITIONED FOR A MINIMUM
(NULL) RECEIVER DISPLAY.
GROUND RETURN PROBE IS
POSITIONED FOR A MINIMUM
(NULL) RECEIVER DISPLAY.
SHEATH-TO-GROUND
FAULT
f
aults
b
eneath
p
aved
s
urfaCes
