and for
the class of insulation used shall not exceed the values in NEMA MG
1. The
motor shall be rated for continuous duty when submerged and shall
also be
capable of operation in the dry for short periods of time for
testing
and maintenance purposes.
2.2.4.1
Torque
Starting torque shall be sufficient to start the pump, but in no case less
than 60 percent of full-load torque. Break-down torque shall not be less
than 150 percent of full-load torque.
2.2.4.2
Support
Thrust bearing support shall have sufficient strength and rigidity to
support the weight of the entire rotating element of the motor, pump
impeller and shaft, and the hydraulic thrust.
2.2.5
Cable
Power and instrumentation cable shall be specifically designed for use with
a submersible pump application and shall conform to the requirements of
NEMA WC 7. Submersible cable shall be suitable for continuous immersion in
water at the maximum depth encountered. Cable shall have an ampacity of
not less than 125 percent of the motor full load current. The cable length
shall be determined by the pump manufacturer for the installation shown
[but shall not be less than [_____] m. [_____] ft.]
2.2.5.1
Cable Entry
Power and instrumentation cables shall enter the motor through a sealing
system that prevents water entry into the unit and provides strain relief.
The cable entry may be comprised of rubber bushings, flanked by stainless
steel washers, having a close tolerance fit against the cable outside
diameter and the entry inside diameter for sealing by compression of the
bushing, or the entry may be sealed by other gland compression methods.
2.2.6
Pump Control and Monitoring
A self-contained pump control and monitoring system shall be provided.
Pump controls and control panels shall be provided in accordance with
[Section [_____]] [_____]. Independent local indication of the alarm and
separate contacts for the remote indication of each alarm and local reset
shall be provided. Sensors shall alarm and shut down the pump at an
abnormal operating condition. Separate red alarm indicator lamps and green
pump running lamps shall be provided and labeled in the enclosure specified
in [Section [_____]] [_____]. The following sensors shall be provided:
[a. A thermal sensor in the gear reduction unit (if used) to monitor
oil temperature.]
b. Temperature sensors in the stator windings to protect the motor
against overheating.
c.
Temperature sensors to monitor the main and support bearings.
d. Float-switch sensor positioned between the bearings and the
stator-end coils to detect if liquid penetrates the stator housing.
e.
A junction box leakage detector and a water-in-oil detector.
SECTION 15132A
Page 22
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