Rain Bird MDC2, Instructions Manual, Page: 17 / 124

Installation,
continued
11
Grounding the Controller
The MDC2 Controller is equipped with built-in
electrical surge protection. For this system to
function, you must properly ground the controller.
Warning! Connect the controller to the
grounding grid using at least a #8 AWG (10 mm)
or #10 AWG (6 mm) bare wire . The wire should
be as short and as straight as possible . You
will void the warranty if you do not ground the
controller to a maximum reading of five ohms .
To connect the ground wire,
1. Loosen the screw on the copper earth ground
terminal and slide the end of the ground wire
into the terminal. Tighten the screw to secure
the wire.
2. Feed the ground wire through the same conduit
you used for the communications cable and
connect it to ground.
Connecting to the Main Power Source
The three Main power input wires for a standard
120-Volt AC transformer are black, white and
green. You will find these wires in the high voltage
compartment in the lower left corner of the
controller cabinet.
To prevent electrical shock, make sure
all supply power is
OFF
before
connecting these wires. Electrical shock
can cause severe injury or death.
All electrical connections and wiring
runs must be made according to local
electrical building codes.
To feed the power wires,
1. Locate the high voltage compartment cover,
remove the screw and swing open the cover.