Toro Network 8000 Installation Instructions page 2

Installing Earth Ground
Low resistance earth ground conductors must
be installed and connected to the controller
cabinet ground lug and the surge protection
module ground lug for proper operation of the
surge protection devices. A ground conductor
(or conductors) with a total resistance of 10
Ohms or less must be installed within 12 feet
(3.6 m) of the surge protection devices. Use
one or both of the following recommended
methods to achieve proper grounding:
• Drive one or more 5/8 in. (16 mm) by 8 ft.
(2.5 m) copper clad steel rods into well
moistened soil within12 ft. (3.6 m) of con-
troller.
• Bury one or more 1/8 in. x 1 ft. x 1-1/2 ft.
(3 mm x 30.5 cm x 46 cm) copper plates in
well compacted, moistened soil within 12 ft.
(3.6 m) of controller.
1. Using an earth resistance testing instru-
ment,* measure resistance of ground
conductor(s). To calculate total resis-
tance (Rt) of multiple ground conduc-
tors, use the following formula:
Rt = 1.1 (Rm/n)
where: Rm = average conductor resistance
n = number of ground conductors
2. Clamp two separate lengths of 6 AWG
non-insulated copper wire to ground con-
ductor(s). Route wires into pedestal
through field wire conduit. Connect one
wire to controller cabinet ground lug and
to surge protection module ground lug as
shown in Figure 3.
* Megger Direct Reading Earth Resistance
Testing Instrument, James G. Biddle
Company, Plymouth Meeting, PA, U.S.A.
Note: Ground wires should be routed to
ground lugs in the most direct route using
the slightest bends possible. In addition, the
ground wires should not be touching other
wires, components or pedestal surfaces.
PRINTING DATE
JULY 1992
REVISION - A
Figure 3
© 1992 THE TORO COMPANY
Irrigation Division
P.O. Box 489
Riverside, California 92502
Printed in U.S.A.
Valve Cover
(Optional)
P/N 850-00
Ground
Conductor
Less Than 12 ft. (3.6 m)
FORM NO.
368-0011