Specifications

Enquiry Specification for Wagon Tippler with Side Arm Charger and Associated works
NRO/CON/WT/533
EPI – New Delhi Volume-2B, Rev.0 Page 37 of 63
(vii) Slip rings − All motors to have continuously rated slip
rings. − Phosphor bronze or steel slip rings
shall be provided .Cast iron slip-rings shall
not be used . − Brush holders shall be in a
complete assembly unit . − Slip ring unit
shall have a cover with inspection window .
− For higher range of motors, separate disc
is provided between the slip ring and rotor
windings to prevent carbon dust ingression
into windings.
(viii) Bearings -For motor of rating upto 5 kW, ball
bearings shall be used for both DE & NDE
end. -For ratings above 5 kW the DE end
shall be provided with roller bearing and
NDE end shall be provided with ball
bearing. -Bearings for motors shall be of C3
clearance . -Bearings shall be suitable for
running of motor in either direction.
(ix)
Hazardous Area safety
design
As per requirement
(x) Canopy To be provided for all outdoor motors .
(xi) Greasing point At DE & NDE sides for online greasing
facility without dismantling the motor.
(xii) Paint shade
Light grey shade 631 as per IS:5 or RAL
7030 (grey).
4.0 Terminal box
(i) Location On top preferably
(ii) Suitability -4 Core Aluminium Cable -Extension shall
be done to receive the aluminium cables to
avoid cramping of the cables in the
terminal box.
(iii) Rotation 4 X 90 deg.
(iv) Earthing stud One earthing stud shall be provided in the
terminal box and two terminals on
mounting feet.
(v) Stator and rotor
connections
Separate and distinctly marked terminal
box to be provided for stator and rotor
connections.
(vi) Protection class IP 55 in all the cases .
(vii) Cable glands
Suitable for double compression type cable
glands .
5.0 Cooling -TEFC design only -Effective irrespective of
direction of rotation -The cooling code of
motor is IC 411 as per IS : 6362.
6.0 Quality of operation
(i) Vibration intensity Shall be limited as per IS 12075-1986.
(ii) Noise level As per IS: 12065-1987
(iii) Balancing Motors shall be dynamically balanced with
full key on the shaft-end and fan