4. Electrical Connections
WARNING: Reduced risk of electric shock during operation of this pump requires
the provision of acceptable grounding. If the means of connection to the supply
connected box is other than grounded metal conduit, ground the pump back to the
service by connecting a copper conductor (at least the size of the circuit supplying
the pump) to the grounding screw provided within the wiring compartment.
Verification of the electrical supply should be made to ensure the voltage, phase and
frequency match that of the motor. Motor electrical data can be found on page 6. If
voltage variations are larger than ± 10%, do not operate the pump. Single-phase motor
control boxes should be connected as shown on the wiring diagram mounted on the
inside cover of the control box supplied with the motor. The type of wire used between
the pump control boxes should be approved for submersible pump application. The
conductor insulation should be type RW, RUW, TW or equivalent.
A high-voltage surge arrestor should be used to protect the motor against lightning and
switching surges. Lightning voltage surges in power lines are caused when lightning
strikes somewhere in the area. Switching surges are caused by the opening and closing
of switches on the main high-voltage distribution power lines.
The correct voltage-rated surge arrestor should be installed on the supply (line) side
of the control box or starter (See Figure 4a & 4b). The arrestor must be grounded in
accordance with the National Electric Code and local governing regulations.
PUMPS SHOULD NEVER BE STARTED UNLESS THE PUMP IS TOTALLY
SUBMERGED. SEVERE DAMAGE MAY BE CAUSED TO THE PUMP AND MOTOR IF
THEY ARE RUN DRY.
The control box shall be permanently grounded in accordance with the National
Electric Code and local governing codes or regulations. The ground wire should be a
bare stranded copper conductor at least the same size as the drop cable wire size.
Ground wire should be as short a distance as possible and securely fastened to a true
grounding point. True grounding points are considered to be: a grounding rod driven into
the water strata; steel well casing submerged into the water lower than the pump setting
level; and steel discharge pipes without insulating couplings. If plastic discharge pipe and
well casing are used, a properly sized bare copper wire should be connected to a stud
on the motor and run to the control panel. Do not ground to a gas supply line. Connect
the grounding wire to the ground point first, then to the terminal in the control box.
Figure 4a Figure 4b
Single Phase Hookup Three Phase Hookup
INSTALLATION PROCEDURES
4
To Next Page
Loading...
