8
2. Heat shrink splice (For wire sizes #14, 12 and 10 AWG
(2, 3 and 5mm
2
):
A. Remove 3/8” (9.5mm) insulation from ends of
motor leads and power supply wires.
B. Put plastic heat shrink tubing over motor leads
between power supply and motor.
C. Match wire colors and lengths between power
supply and motor.
D. Insert supply wire and lead ends into butt
connector and crimp. Match wire colors
between power supply and motor. Pull leads to
checkconnections.
E. Center tubing over butt connector and apply heat
evenly with a torch (match or lighter will not
supply enough heat, Figure 4-6).
NOTICE: Keep torch moving. Too much concentrated heat
may damage tubing.
4.3 3-Phase Starters
Starters are used to start the motor by engaging contacts
that will energize each line simultaneously. The contacts
are closed when the coil is energized.
Figures 4-7 through 4-9 show three types of starters used
on the motors. The control device in the secondary circuit
is typically a pressure switch. Other control could be
provided by level control, timers or manual switches.
Line Voltage Control
This commonly-used control has a coil energized by line
voltage. The coil voltage matches the line voltage.
Low Voltage Control
This starter arrangement uses a transformer to allow
the coil to be energized by a lower voltage. Note that the
secondary circuit must be fused, and the coil sized for the
secondary voltage.
Separate Voltage Control
This arrangement uses power from a separate source to
energize the coil.
SECTION 4: Electrical Power
Figure 4-6: Heat-Shrink Tubing Applied
Connector
Heat shrink tubing
Figure 4-8: Low Voltage Control
3-Phase
Motor
L1
L2
L3
Overload
Control
Control
Device
Coil
Thermal
Overload
Heaters
Figure 4-9: Separate Voltage Control
3-Phase
Motor
L1
L2
L3
Overload
Control
Separate
Voltage
Control
Device
Coil
Thermal
Overload
Heaters
Figure 4-7: Line Voltage Control
3-Phase
Motor
L1
L2
L3
Overload
Control
Control
Device
Coil
Thermal
Overload
Heaters
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