OM-06704 PA SERIES
PAGE B - 6 INSTALLATION
ROCK
8 FEET
(2,4 M)
3/4 INCH (19,1
MM) NOMINAL
DIAMETER
(MINIMUM)
SOIL
SOIL
SOIL
1/4 INCH STEEL
PLATE 2 SQ. FEET
(1858,1 SQ. CM)
SURFACE AREA
(MINIMUM)
a) PLATE ELECTRODE b) DRIVEN ELECTRODE c) BURIED ELECTRODE
3/4 INCH (19,1 MM)
NOMINAL DIAMETER
(MINIMUM) 8 FEET
(2,4 M) LONG
Figure 3. Suggested Grounding Methods
a. Plate Electrode: An iron or steel plate, 1/4
inch (6,4 mm) thick, completely impeded in
the ground. The plate must present a surface
area of at least 2 square feet (1858,1 sq. cm).
b. Driven Electrode: A rod or pipe, 3/4 inch
(19,1 mm) in diameter minimum, 8 feet (2,4 m)
long, completely driven into the ground.
c. Buried electrode: If rock or stone prevents
embedding the full 8 foot (2,4 m) length of the
ground rod, bury it horizontally in a trench.
Space the ground rod or plates at least 6 feet
(1,8 m) from any other electrode or ground
rod, such as those used for signal circuits, ra
dio grounds, lightning rods, etc.
The earth surrounding the ground rod or plate
must contain enough moisture to make a
good electrical connection. In dry or sandy ar
eas, pour water around the rod, or consult
qualified personnel to devise a method of im
proving the connection.
Field Wiring Connections (Incoming Power)
The electrical power used to operate
this pump is high enough to cause inju
ry or death. Obtain the services of a qu
alified electrician to make all electrical
connections. Make certain that the
pump and enclosure are properly
grounded; never use gas pipe as an
electrical ground. Be sure that the in
coming power matches the voltage and
phase of the pump and control before
connecting the power source. Do not
run the pump if the voltage is not within
the limits.
The control is designed to regulate the power sup
ply. The field wiring must be properly sized to en
sure an adequate voltage supply. The voltage
available at the pump motor must be within the in
dicated range.
Table 1. Pump Motor Voltage Limits
Nominal
Voltage
Minimum
Voltage
Maximum
Voltage
Phase
460 3 414 506
If the voltage is not within the recommended limits,
obtain the services of a qualified electrician to de
termine the correct field wiring size and other de
tails to ensure an adequate voltage supply.
Make certain all connections are tight and that ca
ble entry points are rainproof. Support the cable
weight, if required, to prevent excessive strain on
cable clamps and cable.
NOTE
After the power cables have been connected to the
control box, make certain the connection is water
proof.
Voltage Imbalance
Each phase of the incoming three‐phase power
must be balanced with the other two as accurately
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