OM-07264
S SERIES PUMPS
PAGE B - 6
INSTALLATION
ry or death. Obtain the services of a
qualified electrician to make all electri
cal 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.
Do not connect the pump motor directly
to the incoming power lines. The pump
motor is designed to operate through a
Gorman‐Rupp approved control box
which provides overload protection and
power control; otherwise, the pump
warranty will be voided. Make certain
that the pump and control box are prop
erly grounded. Install and operate the
control box in accordance with the Na
tional Electric Code and all local codes.
Failure to follow these could result in in
jury or death to personnel.
Field wiring is
not
provided with the pump, and
must be supplied by the user. The field wiring must
be of the proper size and type to ensure an ade
quate voltage supply to the pump. Voltage avail
able
at the motor
must be within the range indi
cated in Table B‐3.
To calculate the voltage available at the motor, pro
ceed as follows:
a. Measure the voltage across the incoming
lines (1 & 2 for single phase, 1 & 2, 2 & 3, and 1
& 3 for three phase)
while the pump is oper
ating at full capacity
. Refer to the literature
supplied with the control box for power supply
connections.
b. Next, subtract the motor cable voltage drop
(see Table 4,
Pump Power Cable Specifica
tions
).
c. Do not continue to operate the pump if this
voltage is not within the recommended limits.
Obtain the services of a qualified electrician to
determine the correct field wiring size and oth
er details to ensure an adequate voltage sup
ply to the pump.
Table B‐3. Pump Voltage Requirements
NOMINAL
VOLTAGE
3
3
230
460
210
420
250
500
PHASE
MINIMUM
VOLTAGE
MAXIMUM
VOLTAGE
1
230
220
240
575
3
520
630
1
115
110
120
380
3
345
415
Make certain all connections are tight and that
cable entry points are rainproof. Support the cable
weight, if required, to prevent excessive strain on
cable clamps and cable.
Grounding Methods
Electrically ground the installation before connect
ing the field wiring to the control box. Install a
grounding terminal to the enclosure and connect
it to a properly embedded electrode.
The material used for the electrode
must
be an ex
cellent conductor of electricity, such as copper. If
iron or steel is used, it must be galvanized or other
wise metal plated to resist corrosion.
Do not
coat
the electrode with any material of poor conductiv
ity, such as paint or plastic.
The electrode must conform to the recommenda
tions of N.E.C. ARTICLE 250. Follow all installation
requirements of the N.E.C., and all applicable
codes. See Figure B-3 for some suggested
grounding methods.
