10
IRRITROL Decoder Systems
The interface
The interface must be grounded with a ground rod
or ground plate connected via a 14AWG / 2.5mm
2
wire. The resistance to the ground must be 10 Ω or
less. Eventually place more ground rods
n a Y configuration welded together to establish
the desired resistance. It is also recommended
to establish the grounding in an area which has
a high soil moisture. It could even be in an area
regularly irrigated by the system to keep a good
connection to the soil.
The field installation
The field installation must be grounded to protect
against lightning surge. The installation must be
grounded via special surge protection decoders
(see below).
The surge protection decoders must be placed
along the wires for every 150 m / 500’ plus at the
end of each branch. The surge protection decoder
must be grounded via a ground rod of 50 Ω or less.
It is important not to deviate from the specified
cable type above and use single wires. This can be
tempting in a retrofit installation, but the two wires
will most likely not run in parallel. Thus, a lightning
surge will be induced as a dierential surge. This
is harmful to the decoders.
5. ASSEMBLY REQUIREMENTS
Decoder installation
It is recommended to install the decoders as
shown. Leave about 1 m / 3’ 2-wire cable to allow
future work or troubleshooting on the installation.
Leave 30 cm / 1’ of 2-wire wires without the
outer jack to allow using a clamp meter for
troubleshooting.
Ensure watertight connections on both the 2-wire
connections and the solenoid connections.
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