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Earth Ground Installation
Important! Toro surge protection devices require an acceptable earth ground to dissipate excess energy. An earth
ground is required in all cases, and a measured resistance of 10 ohms or less is recommended. If it is impractical to
achieve a measured resistance of 10 ohms, the installation of ground rods, ground plates, and ground enhancement
material per the grounding material manufacturer's instructions is recommended. It is further recommended that all earth
grounds and surge protection devices be checked yearly and after each lightning event. Toro advises against the use of a
bonding/shielding wire in conjunction with Toro irrigation control systems. Grounding materials or equipment that are not
specified in these instructions should not be connected to the Toro control products, Toro communication/power wiring
or the grounding for the communication/power wiring. All electrical equipment grounds must meet local electrical codes.
Procedure
1.
Drive a 5/8" (16mm) by 8' (2.5m) copper-
clad steel rod into well-moistened soil not
more than 12' (3.7m) from the satellite. The
top of the ground rod should be slightly
below grade level.
2.
Using a 5/8" (16mm) clamp or "Cad weld"
fastener, attach a length of #6 (6mm
copper wire near the top of the ground
rod. Avoiding sharp bends, route the wire
through the foundation into the satellite.
Secure the wire to the large copper ground
lug provided on the power supply chassis.
See Figure 2.
Note: Make sure the soil surrounding
the ground rod(s) remains well moistened
at all times. The addition of some form of
irrigation may be required if the satellite is
installed in a non-irrigated location.
3.
Measure the ground resistance per the
instructions provided with the ground test
instrument. If the resistance exceeds the
acceptable limit, additional ground rod(s)
can be installed at a distance equal to twice
the buried depth of the first rod; i.e., 16'
(4.9m).
Note: A Toro Valve Cover, P/N 850-00, works well for covering the ground rod and providing access to the ground
wire connection(s).
Figure 2
Valve Box
) solid
2
12"
(30.5cm)
Copper-Clad
Ground Rod
Ground Wire to
Additional Rods
(Optional)
Chassis Ground Lug
6 AWG (10mm
) Solid
2
Copper Ground Wire
8" (20.3cm)
Minimum Radius
8'–12' (2.4m–3.7m)
Copper Clad
Ground Rod
90º
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