Gorman-Rupp Pumps SE1 1/2A3 115V 1P 1483930 and up - Manual (Page 12)

OM−06488 SE SERIES
PAGE B − 5 INSTALLATION
To calculate the voltage available at the motor, pro-
ceed as follows:
a. Measure the voltage while the pump is oper-
ating at full capacity. See wiring diagrams at
the end of this section.
b. Next, subtract the motor cable voltage drop
(see Table B-5, Pump Power Cable Specifi-
cations).
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 PHASE
MINIMUM
VOLTAGE
MAXIMUM
VOLTAGE
1 115 110 120
Grounding Methods
The power cable will be wired into an optional
manual switch or control box, ground the enclo-
sure before installing the wiring. In any of these
cases, the electrical circuit must be grounded to a
properly imbedded 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 local
codes. See Figure B−3 for some suggested
grounding methods.
ROCK 8 FEET
(2,4 M)
3/4 INCH (19,1
MM) NOMINAL
DIAMETER
(MINIMUM)
3/4 INCH (19,1 MM)
NOMINAL DIAMETER
(MINIMUM) 8 FEET
(2,4 M) LONG
SOIL SOIL SOIL
1/4 INCH (6,4 MM)
STEEL PLATE 2 SQ.
FEET (1858,1 SQ. CM)
SURFACE AREA
(MINIMUM)
a) PLATE ELECTRODE b) DRIVEN ELECTRODE c) BURIED ELECTRODE
Figure B−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) from any other electrode or ground rod,
such as those used for signal circuits, radio
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
areas, pour water around the rod, or consult
qualified personnel to devise a method of im-
proving the connections.