Gorman-Rupp Pumps S3B65-E6 460/3 861279 thru 1217130 - Manual (Page 19)

S SERIES PUMPS OM−04151
PAGE B − 13 INSTALLATION
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.